Staff Notes Daily Calendar Events

Tuesday, February 16, 2016 - 11:00am

Unprecedented climate change in the Arctic, particularly the reduction in summer sea ice has opened up opportunities for business in diverse sectors such as fossil fuel & mineral extraction, shipping and tourism. Recent studies have indicated that sea ice is a major source of climate predictability on seasonal and longer timescales, but this potential is yet to be realised in actual prediction systems. In this talk I will discuss where we are in terms of predicting Arctic sea ice on seasonal and longer timescales, what the major sources of predictability are, and what I see as the road ahead to achieve this potential. 

Presenter(s):
Jonathan Day, University of Reading
Type of event:
Seminar/Symposium
Building:
Mesa Lab
Room:
Main Seminar Room
Will this event be webcast by NCAR/UCAR?
Yes - ML-Main Seminar Room - http://ucarconnect.ucar.edu/live

Posted by Gaylynn Potemkin (potemkin@ucar.edu) at x1618
Lab/division hosting the event:
NCAR, CGD
Affiliation or organization:
Wednesday, February 17, 2016 - 10:00am

UDUG is an active community of web developers who meet every other week to explore a Drupal development topic and share tips and tricks. Drupal gives web developers a rich toolkit for developing full-featured websites.

UDUG meets the third Wednesday of the month from 10-11:30AM at various locations.

Agenda

Presenter(s):
Lara Ziady, Michelle Flores and Terri Hamner co-chairs
Type of event:
No event type category
Building:
FL3
Room:
2072 (MMM Conference Room)
Will this event be webcast by NCAR/UCAR?
No

Posted by Terri Hamner (thamner@ucar.edu) at x8927
Lab/division hosting the event:
NCAR
Affiliation or organization:
Wednesday, February 17, 2016 - 10:00am

The terrestrial ionosphere driven from above and from below: a modeling experience

The terrestrial ionosphere represents an interface between the magnetosphere and lower atmosphere. Conditions in the ionosphere depend on both the space weather from above and the neutral atmospheric dynamics from below. With numerical simulations of the ionosphere, I look into the total electron content (TEC) disturbances induced by 1) geomagnetic storms 2) atmospheric acoustic-gravity waves. For geomagnetic storms, I make TEC predictions with the Global Ionosphere-Thermosphere Model (GITM) to explore the feasibility of ionospheric forecasts with the current generation of physics-based models. A TEC metric has been proposed to quantify forecasted storm-time TEC disturbances. The simulation results are compared with Global Positioning System satellite observations. For atmospheric acoustic-gravity waves, I focus on upward propagating waves generated by tsunamis and earthquakes, which could cause traveling TEC perturbations in the ionosphere. To capture this process, I have developed a three-dimensional physics-based model Wave Perturbation-GITM. The model is shown to reproduce the ionospheric signatures of a major tsunami event.

Presenter(s):
Xing Meng
Type of event:
Seminar/Symposium
Building:
CG1
Room:
South Auditorium
Will this event be webcast by NCAR/UCAR?
Yes - CG1-Auditorium - http://ucarconnect.ucar.edu/live

Posted by Sheryl Shapiro (sheryls@ucar.edu) at x1567
Lab/division hosting the event:
NCAR, HAO
Affiliation or organization:
Wednesday, February 17, 2016 - 1:30pm

Simulating Solar Cycles

The existence of solar activity cycles has been recognized for more than 150 years; their influence on the Earth has been known for almost as long. Numerous segments of modern economies are strongly affected by the variable outputs of the Sun—radiation, energetic particles and electromagnetic fields—that are associated with solar activity. Therefore, it is of great value to understand the origins of solar activity, simulate individual cycles, and ultimately to be able to predict the characteristics of the next solar cycle. To do that requires a physical model that can be “calibrated” to the Sun, just as to be of value for weather and climate simulation and prediction, atmospheric dynamical models must be calibrated to atmospheric observations. I will describe a class of model that can be calibrated well for the Sun, namely the so-called Babcock-Leighton flux transport dynamo models. I will review successes achieved with a 2D version of this model, and also, when applied to prediction, what forecasts have been validated and what have not. I will show how the implementation of modern data assimilation methods in the dynamo model can utilize the vast SDO/HMI velocity and magnetic field data to improve the model's simulation capability. Furthermore, accounting for the role of longitude-dependent solar cycle features may significantly improve the model. I will show that nonlinear evolution of global HD/MHD instabilities in the tachocline can create large-scale longitude-dependent patterns of flow and magnetic fields, which can manifest as imprints at the surface. Therefore, I will describe how a 3D comprehensive dynamo model, coupled with a global tachocline instability model, can be built for operation in a data-assimilative mode, to simulate and ultimately predict the longitude-averaged as well as longitude-dependent solar cycle features that project into the interplanetary environment, such as coronal magnetic structures and solar wind streams.

Presenter(s):
Mausumi Dikpati
Type of event:
Seminar/Symposium
Building:
CG1
Room:
South Auditorium
Will this event be webcast by NCAR/UCAR?
Yes - CG1-Auditorium - http://ucarconnect.ucar.edu/live

Posted by Sheryl Shapiro (sheryls@ucar.edu) at x1567
Lab/division hosting the event:
NCAR, HAO
Affiliation or organization:
Wednesday, February 17, 2016 - 3:00pm

Date: February 17, 2016
Time: 3pm
Place: Foothills Laboratory Bldg 2 Room 1001
Speaker: Dr. Michael J.Peterson - Postdoctoral Research Associate
High Altitude Observatory (HAO)


Lightning, Electrified Clouds, and the Global Electric Circuit

The Global Electric Circuit (GEC) is an important component of the Earth’s electrical subsystem through which currents flow from the tops of storm clouds to the Ionosphere to maintain its electrical potential. Early 20th century expeditions by the research vessels Carnegie and Maud studied the diurnal cycle of the circuit by recording how fair-weather electric fields across the globe varied with Universal Time (the “Carnegie curve”). Modern satellite platforms make it possible to examine the circuit from a different perspective, that of its inputs: electrified shower clouds and thunderstorms. Tropical Rainfall Measuring Mission (TRMM) lightning observations and retrievals of electric field strength are used to characterize electrified clouds across the tropics and discuss their importance to the global circuit in the context of the Carnegie results.

Presenter(s):
Dr. Michael J. Peterson - Post Doctoral Research Associate
Type of event:
Seminar/Symposium
Building:
FL2
Room:
1001
Will this event be webcast by NCAR/UCAR?

Posted by Marybeth Zarlingo (zarlingo@ucar.edu) at x2751
Lab/division hosting the event:
NCAR, HAO
Affiliation or organization:
Thursday, February 18, 2016 - 11:00am

Date: February 18, 2016

Time: 11am

Place: Foothills Laboratory 2 Room 1001

Speaker: Flavia N. D. Ribeiro
Professor of Environmental Modeling at the School of Arts, Sciences and Humanities
University of Sao Paulo - Brazil


The influence of sea-breeze in the planetary boundary layer of the Metropolitan Regio of Sao Paulo - Brazil

Abstract
The Metropolitan Region of Sao Paulo (MRSP) is the largest in Brazil, with approximately 20 millions inhabitants (almost 10 % of the population of the country) and more than 6 millions vehicles. Urbanization and the growing vehicular fleet are main contributors to severe air quality problems, and yearly 9,700 deaths can be attributed to air pollution. Pollutants concentrations are highly dependent on meteorological conditions, particularly those processes that impact the planetary boundary layer (PBL) structures. The recent MCITY Brazil field campaign project provides an excellent opportunity to investigate factors impacting the PBL evolution in MRSP and to assess the WRF-Urban model’s capability to capture it. The impact of the sea-breeze circulation on the PBL development in Sao Paulo is analyzed using winter and summer MCITY observational data and numerical simulations. Even though it is located approximately 50 km inland and in an altitude of 700 m above sea level, sea-breeze fronts reach Sao Paulo almost 50% of the days of the year. The simulations considered interactions between urbanization, topography, and regional sea-breeze circulation. For instance, results reveal that the high terrains between the coast and the city accelerate the sea-breeze propagation, allowing the sea-breeze to reach the urban area. In fact, the sea breeze front brings colder and moister air to the urban area, creating a temperature inversion that causes the PBL height to decrease in the afternoon. Synoptic conditions are also important in determining whether the sea-breeze circulation will reach the city or not and the sea-breeze was more frequent during the summer than the winter campaign. An urban heat island circulation with deeper PBL over the city than over non-urban areas is responsible for delaying the

Presenter(s):
Flavia N.D. Ribeiro Ph.D.
Type of event:
Seminar/Symposium
Building:
FL2
Room:
1001
Will this event be webcast by NCAR/UCAR?

Posted by Marybeth Zarlingo (zarlingo@ucar.edu) at x2751
Lab/division hosting the event:
NCAR, RAL, HAP
Affiliation or organization:
Thursday, February 18, 2016 - 1:30pm

Connections between sudden stratosphere warmings and upper atmosphere variability

Sudden stratosphere warmings (SSWs) are dynamical disturbances that occur in the high latitude, wintertime, stratosphere. Though a connection between SSWs and variability in the equatorial ionosphere was initially proposed in the 1970's, it is only in recent years that observations have unequivocally tied upper atmosphere variability to SSWs. A direct coupling between the high-latitude stratosphere and equatorial ionosphere is unanticipated. The connection between SSWs and ionosphere variability is therefore surprising, and several different mechanisms have been proposed to explain this connection. Results from numerical modeling and observational studies aimed at understanding the mechanisms by which SSWs generate upper atmosphere variability will be presented. Model simulations are first used to demonstrate that the variability in the equatorial ionosphere is primarily driven by modulation of dynamo generated electric fields due to changes in the solar and lunar migrating semidiurnal tides. The tidal variability is further shown to modify the global circulation of the upper atmosphere, inducing near-global decreases in the mean thermosphere composition ([O]/[N2]) and ionosphere electron density. The results demonstrate that different mechanisms combine to generate complex upper atmosphere variability during SSWs.

Presenter(s):
Nick Pedatella
Type of event:
Seminar/Symposium
Building:
CG1
Room:
South Auditorium
Will this event be webcast by NCAR/UCAR?
Yes - CG1-Auditorium - http://ucarconnect.ucar.edu/live

Posted by Sheryl Shapiro (sheryls@ucar.edu) at x1567
Lab/division hosting the event:
NCAR, HAO
Affiliation or organization:
Thursday, February 18, 2016 - 3:30pm

Tornadoes are among nature's most destructive forces. The most violent, long-lived tornadoes form within supercell thunderstorms. Tornadoes ranked EF4 and EF5 on the Enhanced Fujita scale that exhibit long paths are the least common but most damaging and deadly type of tornado.

In this talk, results from numerical simulations of supercells containing violent, long-track tornadoes will be presented, focusing primarily on a 30 meter simulation of a supercell modeled within the 24 May 2011 El Reno, OK supercell environment. Preliminary results from a recent 20 meter simulation of the 24 May 2011 storm will also be presented, including the entire life cycle of a multiple-vortex EF5 tornado which transitions from a single-celled tornado, to a two celled tornado, to a multiple vortex tornado before dissipating. The genesis, maintenance, and decay phases of the tornadoes will be explored using high quality visualization techniques designed to provide insight into the storm.

Presenter(s):
Leigh Orf
Type of event:
Seminar/Symposium
Building:
FL2
Room:
1022
Will this event be webcast by NCAR/UCAR?

Posted by Caroline Haws (haws@ucar.edu) at x8189
Lab/division hosting the event:
NCAR, MMM
Affiliation or organization:
Friday, February 19, 2016 - 1:30pm

Between Earth and Space: Data Assimilation and Predictability of the Upper Atmosphere

The Earth’s upper atmosphere is a critical juncture between the Earth and geospace. Being exposed to vacillating conditions of both space and terrestrial weather, the region’s physical processes exhibit nonlinear sensitivity to initial conditions and forcing. To fully address the predictability of the upper atmosphere, it is important to embrace a paradigm shift from a deterministic to a probabilistic modeling framework and a systematic integration of observations into a numerical predictive modeling system through data assimilation.

Even though the thermospheric observations are scarce, there are a growing number of ionospheric observations, especially from GPS receivers on the ground and low Earth-orbiting platforms. By treating the ionosphere-thermosphere coupling self-consistently in both the forecast model and the assimilation scheme, unobserved thermospheric states are inferred from the relatively plentiful observations of the ionosphere. This in turn extends the practical predictability of the thermosphere and ionosphere considerably. In this talk, I will demonstrate these points by using an ensemble data assimilation system constructed with NCAR’s Data Assimilation Research Testbed and the Thermosphere-Ionosphere-Electrodynamics General Circulation Model.

Given NASA’s upcoming upper atmosphere missions, such as GOLD and ICON, as well as the COSMIC-II radio occultation mission, the importance of data assimilation in upper atmosphere research is becoming even more pronounced.

Presenter(s):
Tomoko Matsuo
Type of event:
Seminar/Symposium
Building:
CG1
Room:
South Auditorium
Will this event be webcast by NCAR/UCAR?
Yes - CG1-Auditorium - http://ucarconnect.ucar.edu/live

Posted by Sheryl Shapiro (sheryls@ucar.edu) at x1567
Lab/division hosting the event:
NCAR, HAO
Friday, February 19, 2016 - 6:00pm

Parent's Night Out is a great opportunity for you and your significant other to get out to dinner and a movie! By emailing the Center Director, Stephanie Ivancic, you could sign your child up from 6pm-8pm ($30 for one child or $40 for two children) or 6pm-10pm ($50 for one child and $60 for two children).

Children are welcome to wear their pajamas for a fun evening of movies and pizza! If your child has a video that he or she would like to share, bring it in. Please make sure it is labeled and let the fun begin! Siblings under the age of 7 are welcome as well.

We are inviting all UCAR employees to take advantage of this as your child does not need to be enrolled at the center to partake!

Children’s Creative Learning Center (CCLC)
Stephanie Ivancic (sivancic@cclc.com)
3050 34th Street, Boulder
http://www.cclc.com/our-centers/boulder/co/000674/

Presenter(s):
Children’s Creative Learning Center
Type of event:
Wellness/Benefits
Building:
CCLC: 3050 34th Street, Boulder
Will this event be webcast by NCAR/UCAR?
No

Posted by Laurie Carr (lcarr@ucar.edu) at x8702
Lab/division hosting the event:
UCAR
Affiliation or organization:
Sunday, February 21, 2016 - 3:00pm

The UCAR Community Art Program cordially invites you to an art reception for artists Diane Wood & Sandra Haberkorn. Pastel paintings will be on exhibit in Gallery l & ll of the NCAR Mesa Lab cafeteria. 1850 Table Mesa Drive, Boulder, CO. The reception is Sunday February 21th from 3:00 to 5:00 pm. Small appetizers and non-alcohol drinks will be served. Come meet the artists and be inspired by their beautiful artwork! 

Presenter(s):
Community Art Program/UCAR Center For Science Education
Type of event:
Celebration
Building:
Mesa Lab
Room:
Cafeteria
Will this event be webcast by NCAR/UCAR?
No

Posted by Audrey Lewis (alewis@ucar.edu) at x2570
Lab/division hosting the event:
UCAR
Affiliation or organization:
Tuesday, February 23, 2016 - 11:00am

This seminar will give an overview of the many facets of deriving and implementing a new transport scheme into the state-of-the-art climate model CAM (Community Atmosphere Model). To meet the challenge of high computational throughput on supercomputers for many-tracer climate/weather applications and demands for increased accuracy and consistency, a new tracer transport scheme has been developed (CSLAM – Conservative semi-Lagrangian Multi-tracer Transport scheme). To achieve important aspects of accuracy such as mass-conservation, shape-preservation, optimal maintenance of correlations as well as consistency, the coupling of the transport scheme and the dynamical core is crucial and often overlooked. A novel algorithm for coupling finite-volume schemes, such as CSLAM, with spectral element dynamics (CAM-SE) will be presented. Introducing CSLAM into CAM-SE has motivated a separation of the grid on which physical parameterizations are computed and the grid used by the dynamical core. This opens avenues for novel research on physics-dynamics coupling. 

Presenter(s):
Peter Lauritzen, NCAR/CGD
Type of event:
Seminar/Symposium
Building:
Mesa Lab
Room:
Main Seminar room
Will this event be webcast by NCAR/UCAR?
Yes - ML-Main Seminar Room - http://ucarconnect.ucar.edu/live

Posted by Gaylynn Potemkin (potemkin@ucar.edu) at x1618
Lab/division hosting the event:
NCAR, CGD
Affiliation or organization:
Wednesday, February 24, 2016 - 3:30pm

The current generation of models has followed a myriad of different development paths, making it difficult to identify a clear path to model improvement. Model comparison studies have been undertaken to explore model differences, but have not been able to meaningfully attribute inter-model differences to individual model components because there are often too many differences among the participating models. Model comparison studies have therefore provided limited insight into the causes of differences in model behavior, and model development has relied on the inspiration and experience of individual modelers rather than on a systematic analysis of model shortcomings. 


This presentation introduces a unified approach to process-based hydrologic modeling to enable controlled and systematic evaluation of different modeling approaches. Our model framework, called the Structure for Unifying Multiple Modeling Alternatives (SUMMA), formulates a general set of conservation equations, providing the flexibility to experiment with different spatial representations, different flux parameterizations, different model parameter values, and different time stepping schemes. We present a series of case studies to illustrate how the SUMMA framework enables users to decompose the modeling problem into the individual decisions made as part of model development, and evaluate different model development decisions in a systematic and controlled way.

Presenter(s):
Martyn Clark
Type of event:
Seminar/Symposium
Building:
FL2
Room:
1022
Will this event be webcast by NCAR/UCAR?

Posted by Rhonda Moore (rhonda@ucar.edu) at x8389
Lab/division hosting the event:
NCAR, RAL, HAP
Affiliation or organization:
Thursday, February 25, 2016 - 3:30pm

Each year, NOAA/AOML’s Hurricane Research Division (HRD) conducts its Hurricane Field Program in which observations are collected via NOAA aircraft to improve the understanding and prediction of hurricanes. Mission experiments suggest a variety of flight patterns and sampling strategies aimed towards their respective goals described by the Intensity Forecasting Experiment (IFEX; Rogers et al., BAMS, 2006, 2013), a collaborative effort among HRD, NHC, and EMC. Evaluating the potential impact of various trade-offs in design is valuable for determining the optimal air reconnaissance flight pattern for a given prospective mission. AOML’s HRD has developed a system for performing regional Observing System Simulation Experiments (OSSEs) to assess the potential impact of proposed observing systems on hurricane track and intensity forecasts and analyses. This study focuses on investigating the potential impact of proposed aircraft reconnaissance observing system designs. Aircraft instrument and flight level retrievals were simulated from a regional WRF ARW Nature Run (Nolan et al., 2013) spanning 13 days, covering the life cycle of a rapidly intensifying Atlantic tropical cyclone. The aircraft trajectories are simulated in a variety of ways and are evaluated to investigate the potential impact of aircraft reconnaissance observations on hurricane track and intensity forecasts.

Presenter(s):
Kelly Ryan
Type of event:
Seminar/Symposium
Building:
FL2
Room:
1022
Will this event be webcast by NCAR/UCAR?

Posted by Caroline Haws (haws@ucar.edu) at x8189
Lab/division hosting the event:
NCAR, MMM
Affiliation or organization:
Monday, February 29, 2016 - 3:30pm

Thunderstorms can be viewed as processors of trace gases in the atmosphere via convective transport, scavenging by cloud particles, lightning production of nitrogen oxides, and cloud chemistry. Because the kinematics, physics, and lightning can vary from storm to storm, it is especially challenging to understand how each process modifies tropospheric composition. For example, the redistribution of trace gases and aerosols in an ordinary, airmass thunderstorm can be quite different than that in severe storms, such as those experienced over the central United States. This talk will review what we have learned about thunderstorms and chemistry over the past 25 years, with special emphasis on recent results from the Deep Convective Clouds and Chemistry (DC3) field experiment that was conducted in May-June 2012.

In this talk, I will focus on the convective transport of the highly soluble hydrogen peroxide and less soluble methyl hydrogen peroxide trace gases. Both of these trace gases are important for producing hydrogen oxides and subsequently ozone. Several thunderstorms from the DC3 field campaign are analyzed to determine the scavenging efficiency of these two peroxide species.  While the highly soluble hydrogen peroxide is readily scavenged with scavenging efficiencies over 80%, the less soluble methyl hydrogen peroxide has a much greater range of scavenging efficiencies (12-84%). To determine why methyl hydrogen peroxide can have such high scavenging efficiencies, its estimated scavenging efficiencies are compared to several factors associated with each storm case. It is found that entrainment rates, the role of ice in scavenging these gases, and possibly nitrogen oxide levels are correlated with the amount of methyl hydrogen peroxide scavenging.

Presenter(s):
Mary C. Barth
Type of event:
Seminar/Symposium
Building:
FL2
Room:
1022
Will this event be webcast by NCAR/UCAR?

Posted by Dianne Hodshon (dhodshon@ucar.edu) at x1401
Lab/division hosting the event:
NCAR, ACOM
Affiliation or organization:
Wednesday, March 2, 2016 - 12:00pm

How unsteady winds can fuel phytoplankton blooms at fronts in the upper ocean

Daniel Whitt

University of Cambridge

Abstract:

Observations and models suggest that upper-ocean density fronts sometimes exhibit higher chlorophyll, more biomass and/or different plankton community composition at and/or below the surface in a narrow region localized to the front. However, the dynamics that lead to biogeochemical anomalies at fronts are not fully understood. 

In this talk, I will briefly review observations of anomalous biogeochemistry at fronts in the upper ocean. Then, I will present some results from an ongoing numerical process study of how the unsteady part of the wind stress frequency spectrum can sustain higher upward nutrient fluxes and plankton biomass at geostrophic fronts. In particular, I will use experiments with a wind-forced primitive-equation model of an idealized geostrophic front coupled to a four-component ecosystem model to illustrate a synergistic interaction between stronger low frequency (sub-inertial) and weaker high frequency (near-inertial) parts of the wind stress. In this scenario, the addition of a weak high-frequency stress to a strong low-frequency stress leads to a qualitative change from deep biomass maximum to surface bloom and a large increase in the depth-integrated biomass at the front. I will discuss the physics that lead to this biogeochemical sensitivity and the potential implications for other ocean biogeochemical models with different levels of the high-frequency wind stress variance and/or mesoscale-submesoscale geostrophic kinetic energy.

Wednesday, 2 March 2016  

12:00 - 1:00 pm

Mesa Lab, 1850 Table Mesa Drive, Boulder, CO

ML-239 - Damon Room

Presenter(s):
Daniel Whitt
Type of event:
Seminar/Symposium
Building:
Mesa Lab
Room:
ML239 - Damon Room
Will this event be webcast by NCAR/UCAR?
No

Posted by Teresa Foster (teresaf@ucar.edu) at x1741
Lab/division hosting the event:
NCAR, CGD
Affiliation or organization:
Friday, March 4, 2016 - 6:00pm

Parent's Night Out is a great opportunity for you and your significant other to get out to dinner and a movie! By emailing the Center Director, Stephanie Ivancic, you could sign your child up from 6pm-8pm ($30 for one child or $40 for two children) or 6pm-10pm ($50 for one child and $60 for two children).

Children are welcome to wear their pajamas for a fun evening of movies and pizza! If your child has a video that he or she would like to share, bring it in. Please make sure it is labeled and let the fun begin! Siblings under the age of 7 are welcome as well.

We are inviting all UCAR employees to take advantage of this as your child does not need to be enrolled at the center to partake!

Children’s Creative Learning Center (CCLC)
Stephanie Ivancic (sivancic@cclc.com)
3050 34th Street, Boulder
http://www.cclc.com/our-centers/boulder/co/000674/


Presenter(s):
Children’s Creative Learning Center
Type of event:
Wellness/Benefits
Building:
CCLC: 3050 34th Street, Boulder
Will this event be webcast by NCAR/UCAR?
No

Posted by Laurie Carr (lcarr@ucar.edu) at x8702
Lab/division hosting the event:
UCAR
Affiliation or organization:
Monday, March 7, 2016 - 11:00am

ACOM Seminar - Lynne E. Gratz Assistant Professor, Environmental Program Colorado College

Atmospheric Mercury from the Boundary Layer to the Free Troposphere: Airborne Observations of Emissions, Transport, and Chemistry, Environmental Program Colorado College

Abstract:

Mercury (Hg) is a bioaccumulative neurotoxin that is emitted to the atmosphere from both natural and anthropogenic sources. Once in the atmosphere, chemistry and transport are fundamental in determining the introduction of Hg to terrestrial and aquatic ecosystems. While gaseous elemental mercury (Hg(0)) may remain in the atmosphere for months, chemical conversion to the more soluble oxidized form (Hg(II)) facilitates atmospheric deposition. Characterizing the relative atmospheric emissions from major sources and deciphering the mechanism for atmospheric Hg(0) oxidation are therefore paramount to understanding the global Hg cycle. During the 2013 Nitrogen, Oxidants, Mercury and Aerosol Distributions, Sources and Sinks (NOMADSS) campaign, airborne Hg measurements were collected in the eastern U.S. to (1) constrain Hg emissions from major source regions, and (2) identify the mechanism for enhanced Hg(II) in the free troposphere. Two case studies are presented addressing these objectives. First, measurements of total atmospheric Hg, carbon monoxide (CO), nitrogen oxides (NOx), and sulfur dioxide (SO2) are used to characterize emissions from the Chicago/Gary urban/industrial area with respect to the U.S. EPA National Emissions Inventory (NEI). FLEXPART model analyses suggest that there are many small emission sources that are not fully accounted for within the inventory, and/or that the re-emission of legacy Hg is a significant source of Hg to the atmosphere in this region. Second, measurements in a free tropospheric air mass over Texas are used to investigate the mechanism for atmospheric Hg oxidation, which is purportedly induced by bromine radicals but direct observational evidence for this process has been unavailable. Results of a chemical box model for the sampled air mass support the role of bromine as the dominant oxidant of Hg in the upper troposphere. These and other NOMADSS results collectively provide important new insight into the atmospheric emissions, transport, and chemistry that influence global Hg cycling.

Date:  Monday, March 7, 2016

Time:  10:45 refreshments; 11:00 seminar

FL2-1001, Small Auditorium

Presenter(s):
Lynne E. Gratz Assistant Professor
Type of event:
Seminar/Symposium
Building:
FL2
Room:
1001
Will this event be webcast by NCAR/UCAR?
No

Posted by Dianne Hodshon (dhodshon@ucar.edu) at x1401
Lab/division hosting the event:
NCAR, ACOM
Affiliation or organization:
Friday, March 18, 2016 - 6:00pm

Parent's Night Out is a great opportunity for you and your significant other to get out to dinner and a movie! By emailing the Center Director, Stephanie Ivancic, you could sign your child up from 6pm-8pm ($30 for one child or $40 for two children) or 6pm-10pm ($50 for one child and $60 for two children).

Children are welcome to wear their pajamas for a fun evening of movies and pizza! If your child has a video that he or she would like to share, bring it in. Please make sure it is labeled and let the fun begin! Siblings under the age of 7 are welcome as well.

We are inviting all UCAR employees to take advantage of this as your child does not need to be enrolled at the center to partake!

Children’s Creative Learning Center (CCLC)
Stephanie Ivancic (sivancic@cclc.com)
3050 34th Street, Boulder
http://www.cclc.com/our-centers/boulder/co/000674/

Presenter(s):
Children’s Creative Learning Center
Type of event:
Wellness/Benefits
Building:
CCLC: 3050 34th Street, Boulder
Will this event be webcast by NCAR/UCAR?
No

Posted by Laurie Carr (lcarr@ucar.edu) at x8702
Lab/division hosting the event:
UCAR
Affiliation or organization:
Monday, March 28, 2016 - 8:00am

CISL is excited to announce a new series of short courses coordinated by the Institute for Mathematics Applied to Geosciences:  “Beyond P-values”.  This series is aimed at  NCAR  staff and visitors with an interest in acquiring more advanced statistical and data analysis skills. 

Each course will provide a targeted selection of topics in a  specific statistical subject taught by experts in that area. The instruction will be data-driven and will include hands-on teaching of statistical software tools.  The courses will last two to three days and will be limited to a small number of participants to provide high quality one-on-one support by the instructors and additional coaches.  The first course in the series is on the Statistics of Extremes and will take place March 28th through March 30th.  Details on the course agenda and registration can be found here.

Presenter(s):
Dorit Hammerling
Type of event:
Tutorial/Training
Building:
Fleischman
Will this event be webcast by NCAR/UCAR?
No

Posted by Kathy Peczkowicz (kathyp@ucar.edu) at x2431
Lab/division hosting the event:
NCAR, CISL, CISL/IMAGe
Affiliation or organization:
Wednesday, March 30, 2016 - 1:30pm

Suomi NPP’s Day/Night Band Changes the Nightscape of Satellite Remote Sensing

Daytime measurements of reflected sunlight at visible-light wavelengths have been a mainstay of Earth-viewing radiometers since the advent of environmental satellites. At night, optical spectrum radiometers traditionally have been limited to measures of thermal infrared emission, which provide relatively poor information content for many important weather and climate parameters. These deficiencies have in turn limited our ability to characterize the full diurnal behavior of parameters relevant to improved monitoring, understanding and modeling of weather and climate processes. Visible-spectrum light information does in fact exist during the nighttime hours, originating from a wide variety of sources, but its detection requires specialized technology. Such measurements have existed, in a limited way, on U.S. Department of Defense satellites, but the Suomi National Polar-orbiting Partnership (NPP) satellite, which carries a Day/Night Band (DNB) radiometer, now offers the first quantitative measurements of nocturnal visible light. Here, we review through striking imagery examples the paradigm shift in nocturnal low-light visible applications enabled by the DNB. Via a combination of terrestrial and extraterrestrial light sources, we show that visible observations are indeed always available—including moonless nights. The measurements expand many current applications while enabling entirely new and unexpected ones as well. These novel low-light measurements illuminate a wealth of heretofore untrodden interdisciplinary research pathways while providing key insight for the optimized design of follow-on low-light visible sensors.

Presenter(s):
Steve Miller
Type of event:
Seminar/Symposium
Building:
CG1
Room:
South Auditorium
Will this event be webcast by NCAR/UCAR?

Posted by Sheryl Shapiro (sheryls@ucar.edu) at x1567
Lab/division hosting the event:
NCAR, HAO
Affiliation or organization:
Friday, April 1, 2016 - 6:00pm

Parent's Night Out is a great opportunity for you and your significant other to get out to dinner and a movie! By emailing the Center Director, Stephanie Ivancic, you could sign your child up from 6pm-8pm ($30 for one child or $40 for two children) or 6pm-10pm ($50 for one child and $60 for two children).

Children are welcome to wear their pajamas for a fun evening of movies and pizza! If your child has a video that he or she would like to share, bring it in. Please make sure it is labeled and let the fun begin! Siblings under the age of 7 are welcome as well.

We are inviting all UCAR employees to take advantage of this as your child does not need to be enrolled at the center to partake!

Children’s Creative Learning Center (CCLC)
Stephanie Ivancic (sivancic@cclc.com)
3050 34th Street, Boulder
http://www.cclc.com/our-centers/boulder/co/000674/

Presenter(s):
Children’s Creative Learning Center
Type of event:
Wellness/Benefits
Building:
CCLC: 3050 34th Street, Boulder
Will this event be webcast by NCAR/UCAR?
No

Posted by Laurie Carr (lcarr@ucar.edu) at x8702
Lab/division hosting the event:
UCAR
Affiliation or organization:
Friday, April 15, 2016 - 6:00pm

Parent's Night Out is a great opportunity for you and your significant other to get out to dinner and a movie! By emailing the Center Director, Stephanie Ivancic, you could sign your child up from 6pm-8pm ($30 for one child or $40 for two children) or 6pm-10pm ($50 for one child and $60 for two children).

Children are welcome to wear their pajamas for a fun evening of movies and pizza! If your child has a video that he or she would like to share, bring it in. Please make sure it is labeled and let the fun begin! Siblings under the age of 7 are welcome as well.

We are inviting all UCAR employees to take advantage of this as your child does not need to be enrolled at the center to partake!

Children’s Creative Learning Center (CCLC)
Stephanie Ivancic (sivancic@cclc.com)
3050 34th Street, Boulder
http://www.cclc.com/our-centers/boulder/co/000674/

Presenter(s):
Children’s Creative Learning Center
Type of event:
Wellness/Benefits
Building:
CCLC: 3050 34th Street, Boulder
Will this event be webcast by NCAR/UCAR?
No

Posted by Laurie Carr (lcarr@ucar.edu) at x8702
Lab/division hosting the event:
UCAR
Affiliation or organization:
Friday, April 29, 2016 - 6:00pm

Parent's Night Out is a great opportunity for you and your significant other to get out to dinner and a movie! By emailing the Center Director, Stephanie Ivancic, you could sign your child up from 6pm-8pm ($30 for one child or $40 for two children) or 6pm-10pm ($50 for one child and $60 for two children).

Children are welcome to wear their pajamas for a fun evening of movies and pizza! If your child has a video that he or she would like to share, bring it in. Please make sure it is labeled and let the fun begin! Siblings under the age of 7 are welcome as well.

We are inviting all UCAR employees to take advantage of this as your child does not need to be enrolled at the center to partake!

Children’s Creative Learning Center (CCLC)
Stephanie Ivancic (sivancic@cclc.com)
3050 34th Street, Boulder
http://www.cclc.com/our-centers/boulder/co/000674/

Presenter(s):
Children’s Creative Learning Center
Type of event:
Wellness/Benefits
Building:
CCLC: 3050 34th Street, Boulder
Will this event be webcast by NCAR/UCAR?
No

Posted by Laurie Carr (lcarr@ucar.edu) at x8702
Lab/division hosting the event:
UCAR
Affiliation or organization: