Sebastian Rhode (Forschungszentrum Jülich) S3D - spectral analysis tailored to atmospheric Gravity Waves in model data and observations

Sebastian Rhode (Forschungszentrum Jülich) wird auf unserem IAP-Kolloquium einen Vortrag zum Thema "S3D - spectral analysis tailored to atmospheric Gravity Waves in model data and observations" halten.

Zusammenfassung:

Atmospheric gravity waves are part of the horizontal momentum budget and are one of the major processes of vertical transport of horizontal momentum. As such, they strongly impact the dynamics in the middle atmosphere by exerting drag when breaking; hence, knowledge of the GW content within model data and observations is key to understanding the interactions of GWs with the atmosphere and their influence on phenomena like the Quasi-Biennial Oscillation (QBO) and Sudden Stratospheric Warmings (SSWs).We present a spectral analysis tool developed for detecting a wide range of GWs in model and observation data using small-volume sinusoidal fits. The methodology allows for high precision of the individual scales and a localization of the detected GW events. In particular, the methodology retrieves precise GW parameters such as the horizontal and vertical wavelengths, the amplitude, and the direction of the GW. We estimate the vertical flux of horizontal momentum due to GWs (GWMF) from these parameters and approximate the exerted GW drag with some limitations. Finally, we present GW spectra, phase speed spectra, global GWMF distributions, and GW drag from high-resolution ECMWF model data and (simulated) satellite data of the ESA Earth Explorer 11 candidate CAIRT.