Orographic Primary and Secondary Gravity Waves in the Middle Atmosphere From 16-Year SABER Observations
Orographic Primary and Secondary Gravity Waves in the Middle Atmosphere From 16-Year SABER Observations
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来自 16 年 SABRE 观测的中层大气中的地形初级和次级重力波
DOI：
10.1029/2019gl082256
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发表时间：
2019
影响因子：
5.2
通讯作者：
Becker Erich
中科院分区：
文献类型：
--
作者：
Liu Xiao;Xu Jiyao;Yue Jia;Vadas Sharon L.;Becker Erich
使用 2002 年至 2017 年使用宽带发射辐射测量 (SABER) 探测大气所测量的温度剖面，研究了地形初级和更大规模次级重力波 (GW) 的季节和高度依赖性。在南半球约 40°S 的冬季，安第斯山脉上空有一个强烈的 GW 峰值，延伸至 55 公里。利用风和地形数据，我们表明地形重力波突破了平流层急流的峰值高度。 Atz~ 55–65 km，引力波断裂和动量沉积产生体力，产生更大规模的次级引力波；我们表明，后面这些巨峰形成了一个 65 公里以上、向西倾斜的宽峰。在夏季各自半球的中纬度地区，地形引力波的断裂也会产生更大规模的次生引力波，并传播到更高的海拔。地形上的初级引力波和更大规模的次级引力波很可能是 SABER 中引力波持续全球分布的大部分非赤道峰值的原因。
The seasonal and height dependencies of the orographic primary and larger‐scale secondary gravity waves (GWs) have been studied using the temperature profiles measured by Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) from 2002 to 2017. At ~40°S and during Southern Hemisphere winter, there is a strong GW peak over the Andes mountains that extend toz~ 55 km. Using wind and topographic data, we show that orographic GWs break above the peak height of the stratospheric jet. Atz~ 55–65 km, GW breaking and momentum deposition create body forces that generate larger‐scale secondary GWs; we show that these latter GWs form a wide peak above 65 km with a westward tilt. At middle latitudes during summer in the respective hemisphere, orographic GW breaking also generates larger‐scale secondary GWs that propagate to higher altitudes. Both orographic primary and larger‐scale secondary GWs are likely responsible for most of the non‐equatorial peaks of the persistent global distribution of GWs in SABER.