Global analysis of scintillation variance:: Indication of gravity wave breaking in the polar winter upper stratosphere

被引：17
作者：
Sofieva, V. F.
Kyroelae, E.
Hassinen, S.
Backman, L.
Tamminen, J.
Seppaelae, A.
Thoelix, L.
Gurvich, A. S.
Kan, V.
Dalaudier, F.
Hauchecorne, A.
Bertaux, J. -L.
Fussen, D.
Vanhellemont, F.
Fanton d'Andon, O.
Barrot, G.
Mangin, A.
Guirlet, M.
Fehr, T.
Snoeij, P.
Saavedra, L.
Koopman, R.
Fraisse, R.
机构：
[1] Finnish Meteorol Inst, FIN-00101 Helsinki, Finland
[2] AM Oboukhov Inst Atmospher Phys, Moscow 119017, Russia
[3] CNRS, Serv Aeron, F-91371 Verrieres Le Buisson, France
[4] Inst Aeron Spatiale Belgique, B-1180 Brussels, Belgium
[5] ACRI ST, F-06904 Sophia Antipolis, France
[6] European Space Agcy, European Space Res Inst, I-00044 Frascati, Italy
[7] European Space Agcy, European Space Res & Technol Ctr, NL-2200 AG Noordwijk, Netherlands
[8] EADS Astrium, F-31402 Toulouse 4, France
来源：
GEOPHYSICAL RESEARCH LETTERS | 2007年 / 34卷 / 03期
关键词：
D O I：
10.1029/2006GL028132
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
[1] Stellar scintillations observed through the Earth atmosphere are caused by air density irregularities generated mainly by internal gravity waves and turbulence. We present global analysis of scintillation variance in two seasons of year 2003 based on GOMOS/Envisat fast photometer measurements. Scintillation variance can serve as a qualitative indicator of intensity of small-scale processes in the stratosphere. Strong increase of scintillation variance at high latitudes in winter is observed. The maximum of scintillation variance can be associated with the polar night jet. The simplified spectral analysis has shown the transition of scintillation spectra toward small scales with altitude, which is probably related with turbulence appearing as a result of wave breaking. The breaking of gravity waves in the polar night jet seems to start in the upper stratosphere, a predicted, but not confirmed by observations before, feature. Weaker enhancements in tropics are also observed; they might be related to tropical convection.
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页数：7
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