TY  - JOUR
AU  - Ern, M.
AU  - Hoffmann, L.
AU  - Preusse, P.
TI  - Directional gravity wave momentum fluxes in the stratosphere derived from high resolution AIRS temperature data
JO  - Geophysical research letters
VL  - 44
IS  - 1
SN  - 0094-8276
CY  - Hoboken, NJ
PB  - Wiley
M1  - FZJ-2016-07742
SP  - 475-485
PY  - 2017
AB  - In order to reduce uncertainties in modeling the stratospheric circulation, global observations of gravity wave momentum flux (GWMF) vectors are required for comparison with distributions of resolved and parametrized GWMF in global models. For the first time, we derive GWMF vectors globally from data of a nadir-viewing satellite instrument: we apply a 3D method to an Atmospheric Infrared Sounder (AIRS) temperature dataset that was optimized for gravity wave (GW) analysis. For January 2009, the resulting distributions of GW amplitudes and of net GWMF highlight the importance of GWs in the polar vortex and the summertime subtropics. Net GWMF is preferentially directed opposite to the background wind, and, interestingly, it is dominated by large amplitude GWs of relatively long horizontal wavelength. For convective GW sources, these large horizontal scales are in contradiction with traditional thoughts. However, the observational filter effect needs to be kept in mind when interpreting the results.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000393954900055
DO  - DOI:10.1002/2016GL072007
UR  - https://juser.fz-juelich.de/record/825271
ER  -