Seminar/Symposium

Cloud Impacts on Pavement Temperature in Energy Balance Models

RAL Seminar Series Curtis Walker Graduate Research Assistant, University of Nebraska, Lincoln Intern, SOARS program Forecast systems provide decision support for end-users ranging from the solar energy industry to municipalities concerned with winter road maintenance. Pavement temperature is an important variable when considering vehicle response to various weather conditions. Tire friction is a complex function of tire and pavement temperatures. Furthermore, the frictional properties of different road surfaces are also dependent on the pavement temperature and should be considered.

Understanding upwelling near the tropical tropopause and its effects on tracer transport

The zonal mean mass circulation of the stratosphere (i.e. the Brewer-Dobson circulation) is characterized by upwelling in the tropics and downwelling at high latitudes. The ascent near the tropical tropopause largely controls the composition of air entering the stratosphere. Despite its relevance, tropical upwelling is poorly constrained by observations and its magnitude, variability and specific forcings are currently uncertain. The variability of upwelling is especially evident on tracers with steep vertical gradients across the tropical tropause, such as ozone and carbon monoxide.

James Hurrell - NCAR Director Search Town Hall

All staff are invited to attend town hall presentations by the two finalists in the search for the next NCAR Director. The second and final town hall will be:

James Hurrell
Director, NCAR Earth System Laboratory, and
Senior Scientist, NESL's Climate and Global Dynamics Division
NCAR

Michael McPhaden - NCAR Director Search Town Hall

All staff are invited to attend town hall presentations by the two finalists in the search for the next NCAR Director. The first town hall is:

Michael McPhaden
Senior Scientist,
NOAA Pacific Marine Environmental Laboratory, and
Affiliate Professor of 
Oceanography, University of Washington

A multi-scale perspective for sustainability: the challenge of synthesizing processes

Responding to global climate change necessitates making policy decisions at the local and regional scales. More accurate regional predictions at these scales necessitates a better understanding of biosphere-atmosphere interactions, specifically changes in water, carbon, and energy cycling due to anthropogenic modifications of the land surface.

Detection and Attribution of Climate Change Based on Data Assimilation (DADA)

How can observations be used to best evidence the influence on climate of human activities, among other forcings? Statistical methods of Detection and Attribution (D&A)were designed to answer this question. Conventional D&A methods are based on linear regression of spatial or temporal patterns extracted from one or several climate models ("optimal fingerprinting"). On the other hand, how can observations be used to best constrain a numerical model’s state variables and parameters? Methods of Data Assimilation (DA) meet this general purpose.

RAL Seminar Series - The impact of precipitation physical processes on the polarimetric radar variables

RAL Seminar Series 3:30 p.m. Wed 29 May 2013 FL2-1022 The impact of precipitation physical processes on the polarimetric radar variables Dr. Matthew Kumjian NCAR Advanced Study Program ABSTRACT:       The upgrade of the National Weather Service WSR-88D radar network to polarimetric capabilities is now complete, and similar upgrades worldwide are ongoing. These dual-polarization radars provide a wealth of data and information regarding storm precipitation physics.

RAL Seminar Series - Global “warming holes” – their possible mechanisms and simulation in CMIP5 models

RAL Seminar Series 3:30 p.m. Wed 5 June 2013 FL2-1001 Global “warming holes” – their possible mechanisms and simulation in CMIP5 models Zaitao Pan Saint Louis University, St. Louis, Missouri ABSTRACT -------- During the 20th century the south-central U.S. cooled 0.5-2.0 oC while global warming accelerated. This abnormal cooling, termed “warming hole (WH)”, is most evident during summer daytime. Examination of past observations further found more WHs: one in central China and the other in central South America.

HAO Colloquium Series presents Dan Marsh, NCAR/ACD

Projections of the response of the mesosphere and lower thermosphere to anthropogenic climate change

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