QBO modulation of the mesopause gravity wave momentum flux over Tierra del Fuego

被引：26

作者：

de Wit, R. J. ^{[1
]}

Janches, D. ^{[1
]}

Fritts, D. C. ^{[2
]}

Hibbins, R. E. ^{[3
,4
]}

机构：

[1] NASA, Space Weather Lab, Goddard Space Flight Ctr, Greenbelt, MD USA

[2] GATS Inc, Boulder, CO USA

[3] NTNU, Dept Phys, Trondheim, Norway

[4] Birkeland Ctr Space Sci, Bergen, Norway

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 08期

关键词：

QUASI-BIENNIAL OSCILLATION; MIDDLE ATMOSPHERE; SOUTHERN-HEMISPHERE; MODEL; CIRCULATION; WINDS;

D O I：

10.1002/2016GL068599

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The interannual variability of the mesosphere and lower thermosphere (MLT) gravity wave momentum flux over southern midlatitudes (53.7 degrees S) has been studied using more than 7 years of meteor radar observations at Rio Grande, Argentina. A modulation, with periods similar to that of the equatorial stratospheric quasi-biennial oscillation (QBO), is observed in the vertical flux of zonal as well as meridional momentum. The QBO signal is largest in the zonal component during summer and is in phase with the stratospheric QBO at 50 hPa (similar to 21 km). The relation between the stratospheric QBO and the QBO modulation in the MLT gravity wave forcing (derived from the divergence of the momentum flux) was found to be consistent with that expected from the Holton-Tan effect coupled to the interhemispheric coupling mechanism. These results provide the first observational support for the existence of the midlatitude gravity wave forcing anomalies as hypothesized in the interhemispheric coupling mechanism.

引用

页码：4049 / 4055

页数：7

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