Climatology of quasi-2-day wave structure and variability at middle latitudes in the northern and southern hemispheres
Climatology of quasi-2-day wave structure and variability at middle latitudes in the northern and southern hemispheres
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北半球和南半球中纬度准2日波结构和变率的气候学
DOI：
10.1016/j.jastp.2021.105690
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发表时间：
2021
影响因子：
1.9
通讯作者：
Moffat-Griffin, Tracy
中科院分区：
文献类型：
--
作者：
Iimura, Hiroyuki;Fritts, David C.;Lieberman, Ruth S.;Janches, Diego;Mitchell, Nicholas J.;Franke, Steven J.;Singer, Werner;Hocking, Wayne K.;Taylor, Michael J.;Moffat-Griffin, Tracy
本文比较了中纬度准二日波（Q2 DW）在北方半球的温度和中层及低热层水平风场的气候结构。温度的Q2 DW是根据美国宇航局地球观测系统（EOS）Aura卫星上的微波临边探测器（MLS）从2004年8月至2021年5月的17年观测数据确定的，水平风的Q2 DW是使用平衡方程从Aura/MLS地球位势高度数据得出的。夏季南半球和北方半球纬向风振幅最大，冬季北方半球纬向风振幅最大。夏季南半球纬向风振幅大于纬向风振幅，而夏季北方半球纬向风振幅大于纬向风振幅。向西传播的纬向波数3（W3）在两半球都是最大的，但除了众所周知的W 4，W3，W2和向东传播的纬向波数2（E2）外，我们还发现了W1，纬向对称驻波（S 0）和E1。Eliassen-Palm通量推导出每种模式。1月份南半球W3、W2、W1和E2通量呈明显的向上和向极分布，而北方7月份只有W3通量呈明显的向上和向极分布。1月南半球和北方半球低纬度地区的平衡风和雷达风的振幅和相位一致，7月两半球低纬度地区的平衡风和雷达风的振幅和相位一致。此外，Q2 DW是通过累积其它模式从W3调制的幅度和相位。
Climatological structure of the quasi-2-day wave (Q2DW) at middle latitudes in temperature and horizontal winds in the mesosphere and lower thermosphere (MLT) was compared between the northern and southern hemispheres. Determination of the Q2DW in temperature was based on observation data by the Microwave Limb Sounder (MLS) onboard NASA's Earth Observing System (EOS) Aura satellite over 17 years from August 2004 to May 2021 and the Q2DW in horizontal winds was derived from Aura/MLS geopotential height data using balance equations. Amplitudes were maximized in summer in the southern hemisphere and in the meridional wind in the northern hemisphere, but in winter in the zonal wind in the northern hemisphere. Summer amplitudes were larger in the meridional wind than the zonal wind in the southern hemisphere, but zonal amplitudes in winter were larger than meridional amplitudes in summer in the northern hemisphere. Westward propagating zonal wavenumber 3 (W3) was largest in both hemispheres, but in addition to well-known W4, W3, W2 and eastward propagating zonal wavenumber 2 (E2), we also found W1, zonally symmetric standing (S0), and E1. Eliassen-Palm fluxes were derived for each mode. W3, W2, W1, and E2 fluxes were exhibited upward and poleward in January in the southern hemisphere while only W3 fluxes were exhibited clearly upward and poleward in July in the northern hemisphere. The balance winds and radar winds agreed in both amplitude and phase in the southern hemisphere and at lower latitudes in the northern hemisphere in January, and at lower latitudes in both hemispheres in July. Furthermore, the Q2DW is modulation in amplitude and phase from the W3 by accumulating other modes.
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