Abstract 46

The seasonal cycle of gravity wave variances and momentum flux and the impact of the observational filter

Dan Chen^{1, 2}, Peter Preusse¹, Manfred Ern¹, Cornelia Strube¹, Stephen Eckermann³, Martin Riese¹

¹Forschungszentrum Juelich, Juelich, Germany, Juelich, Germany
²Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing, China
³Naval Research Labaratory, Wahington DC, United States

The satellite instruments HIRDLS (2005-2008) and SABER (2002-now) both provide close-to-global data of gravity wave (GW) variances and GW momentum flux. We will use these data to infer a seasonal cycle for various latitudes and altitudes. In order to understand these observed seasonal cycles we will use a combination of ECMWF high resolution data analyzed by local sinusoidal fits (S3D) with upward GROGRAT ray-tracing. Different observational filters will be applied. We will discuss the respective influence of sources, filtering by background wind and modulation by background stability (N) in forming a seasonal cycle for different parts of the wave spectrum.

Reference:

Poster-P-04

Session:

Daily poster session during coffee breaks

Presenter/s:

Dan Chen

Topic:

1) Observed trends and long term variations in the middle atmosphere

Presentation type:

Poster

Room:

Pavilion

Date:

Monday, 19 September 2016

Time:

17:35 - 17:35

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