Convectively Coupled Gravity Waves in Global Models vs Observations

Stefan Tulich

AOP

Tuesday, Jun 07, 2016, 2:00 pm
DSRC Room 2A-305


Abstract

Convectively coupled gravity waves are among the most common forms of disturbed weather in the tropics. Indeed, as will be shown in this talk, such waves were commonly observed over the central and eastern Pacific during the recent ENRR field campaign. Comparing these observations against the high-resolution GFS model's deterministic forecasts, however, shows that the latter fail to capture most types of organized tropical convection, including convectively coupled gravity waves. More specifically, convection in the model is found to be organized mainly into much slower-moving mesoscale disturbances whose propagation mechanisms are not yet clear and may simply be due to advection by the background flow. Because a similar sort of problem is also apparent in most reanalysis products, it seems clear that some systematic deficiencies in convection parameterization are involved. This idea is further explored through a series of idealized numerical simulations performed using several different versions of the Weather Research and Forecast (WRF) model.

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Seminar Contact: richard.Lataitis@noaa.gov