The Tidal Response in the Mesosphere/Lower Thermosphere to the Madden‐Julian Oscillation Observed by SABER

The Tidal Response in the Mesosphere/Lower Thermosphere to the Madden‐Julian Oscillation Observed by SABER
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SABRE观测到的中层/低热层潮汐对马登朱利安振荡的响应

DOI:
10.1029/2020gl089172
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发表时间:
2020
影响因子:
5.2
通讯作者:
Lu, Xian
Lu, Xian
中科院分区:
地球科学1区
文献类型:
--
作者:
Kumari, Komal;Oberheide, Jens;Lu, Xian

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对TIMED卫星上的SABER仪器观测到的18年昼夜温度潮汐的统计研究表明,高层大气(>60公里)的潮汐对热带对流层的马登-朱利安振荡(MJO)有很大的响应。非迁移潮汐振幅调制在季节内MJO期间高达~25%,相对于季节平均值,两倍的迁移潮汐(~10%)。我们充分表征活跃的MJO天的潮汐响应的季节和MJO位置的MJO指数所规定的功能。MJO调制的潮汐模型预测,但不能明确观察到之前。我们的研究结果进一步指出了背景风的重要作用,部分原因是赤道和非赤道潮汐模式在不同的季节,这对电离层发电机区域的MJO印记的影响不同的响应。
A statistical study of 18 years of diurnal temperature tides observed by the SABER instrument on board the TIMED satellite reveals a substantial response of the tides in the upper atmosphere (>60 km) to the Madden‐Julian Oscillation (MJO) in the tropical troposphere. Nonmigrating tidal amplitudes are modulated at the intraseasonal MJO periods up to ~25% relative to the seasonal mean, twice as much as for the migrating tides (~10%). We fully characterize the tidal response for active MJO days as a function of season and MJO location as prescribed by the MJO index. The MJO modulation of the tides was predicted by models but could not be unequivocally observed before. Our results further point to an important role of background winds that partly cause a different response for equatorial and nonequatorial tidal modes in different seasons, which has implications for the MJO imprint on the ionospheric dynamo region.
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