Evidence of mesospheric gravity‐waves generated by orographic forcing in the troposphere
Evidence of mesospheric gravity‐waves generated by orographic forcing in the troposphere
复制标题
对流层地形强迫产生中层重力波的证据
DOI：
10.1029/2008gl036936
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发表时间：
2009
影响因子：
5.2
通讯作者：
M. Mendillo
中科院分区：
文献类型：
--
作者：
Steven M. Smith;J. Baumgardner;M. Mendillo
我们报告了在OH（695-1050 nm），Na（589.3 nm）和O（1 S）（557.7 nm）的三个夜光发射中对静止中间层重力波的首次成像观测。这些波是在2008年7月1日至8日期间在阿根廷的El Leoncito天文台（ELO）（31.8°S，69.3°W）的全天空图像中观测到的。在每个夜晚的过程中，带状波特征表现出零或接近零的水平相速度，并且具有数小时的寿命。这些因素，再加上当地测得的风，以及波浪朝向附近的安第斯山脉的方向，表明波浪是由安第斯山脉上的70 ms−1东风产生的山波。
We report on the first imaging observations of stationary mesospheric gravity‐waves in the three nightglow emissions of OH (695–1050 nm), Na (589.3 nm) and O(1S) (557.7 nm). The waves were observed in all‐sky images at the El Leoncito Observatory (ELO), Argentina (31.8°S, 69.3°W), during the period of 1–8 July 2008. Over the course of each night, the band‐like wave features exhibited a zero or near‐zero observed horizontal phase speed and had lifetimes of several hours. These factors, coupled with the winds measured locally, and the orientation of the waves to the Andes mountain range located nearby, suggested that the waves were mountain waves generated by ∼70 ms−1 eastward winds flowing over the Andes.