Planned closure - NCAR Mesa Lab Road & Facilities - July 4 at 4 pm  more info>

Sigma Xi Presentation: Marine boundary layers with surface wave influences: Results from turbulence simulations

                                 Peter P. Sullivan  Mesoscale and Microscale Meteorology Division, National Center for Atmospheric Research                              Tuesday, March 1, 2011    12:00 Noon                    Foothills Lab. Auditorium (FL2 1022)Gravity waves at the top of the sea surface are visual evidence ofthe coupling between the atmosphere and ocean. They play importantdynamical roles in the transfer of momentum, heat, and scalars buthow they interact with background atmospheric and oceanic turbulenceand their possible role in tropical cyclone evolution is still notwell understood. This is especially true under high winds wherewaves can drive winds, break intermittently and foster Langmuircirculations.  In this presentation we show preliminary resultsfrom large eddy simulations of the marine atmospheric boundary layerevolving over a (prescribed) spectrum of waves in the wind speedrange [5-20] m/s. We find the mean wind profile, turbulence statistics,and surface drag depend on the underlying wave state. Simulationsof the ocean boundary layer include Craik-Leibovich dynamics andstochastic forcing by breaking waves. Simulations with vortex-forceshow enhanced ocean mixing and thermocline cooling. To gauge therelative impact of surface waves and strong inertial shear on oceanmixing we perform large eddy simulations with idealized time varyingforcing representative of a hurricane.
Will this event be webcast to the public by NCAR|UCAR?: 
Announcement timing: 
February 24, 2011 to March 1, 2011