Abstract: Understanding atmospheric coupling from the troposphere/stratosphere to the upper atmosphere is important for improving climate simulations and space weather forecasts. Gravity waves are one of the key elements in driving atmospheric coupling from the troposphere/stratosphere to the mesosphere and thermosphere. Owing to uncertainties caused by gravity wave parameterizations in general circulation models, it is important to advance our understanding and representation of gravity waves. This presentation will focus on variations in gravity waves and their impacts on coupling processes during stratospheric sudden warming (SSW) events. During SSW events, temperature in the winter polar stratosphere increases and eastward winds reverse to westward, causing significant day-to-day variations. SSWs are the largest dynamical disturbances in the polar winter stratosphere. Although SSW events occur in the winter polar stratosphere, impacts of SSWs have been observed globally from the troposphere to the thermosphere and pole-to-pole. This talk will present gravity wave influences on vertical and inter-hemispheric coupling during SSWs using the Whole Atmosphere Community Climate Model (WACCM), the high-resolution European Centre for Medium-range Weather Forecasting (ECMWF) meteorological output and satellite observations from the stratosphere to the thermosphere (COSMIC, TIMED-SABER and ICON-MIGHTI).
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Address Info:
LASP – Space Science Building
SPSC-W120
3665 Discovery Drive, Boulder, CO 80303
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