Statistical study of atmospheric gravity waves in the mesopause region observed by a lidar chain in eastern China
Statistical study of atmospheric gravity waves in the mesopause region observed by a lidar chain in eastern China
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DOI：
10.1002/2014jd022673
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发表时间：
2015-08
期刊：
影响因子：
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通讯作者：
Shaohua Gong;Guotao Yang;X. Dou;Jiyao Xu;Chunxia Chen;S. Gong
中科院分区：
文献类型：
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作者：
Shaohua Gong;Guotao Yang;X. Dou;Jiyao Xu;Chunxia Chen;S. Gong
利用钠激光雷达链对中国东部中层顶大气重力波活动进行了观测和统计研究。在海南（19.99°N，110.34°E）、合肥（31.87°N，117.23°E）和北京（40.47°N，115.97°E）的5400多小时观测中，共识别出471个重力波。这些波的垂直波长λz = 2 − 4 km，观测周期Tob = 1 − 4 h，振幅增长因子β = − 0.025 ~ + 0.05 km−1，振幅Aeβ * 90 km = 1.5 − 6%。强系统参数的关系被发现，他们同意扩散过滤理论的预测。统计结果表明，中国东部中层顶重力波活动的季节变化具有夏季最大、冬季最小的特征。一个定性的解释，提出了激光雷达链观察到的季节性和地理变化，根据分析的源属性和背景风的影响，这随季节而变化。
Atmospheric gravity wave activities in the mesopause region have been observed and statistically investigated with a sodium lidar chain in eastern China. In total, there were 471 gravity waves identified from over 5400 h of observations at Hainan (19.99°N, 110.34°E), Hefei (31.87°N, 117.23°E), and Beijing (40.47°N, 115.97°E). These waves typically had vertical wavelengths of λz = 2 − 4 km, observed periods of Tob = 1 − 4 h, amplitude growth factors of β = − 0.025 ~ + 0.05 km−1, and wave amplitudes of Aeβ * 90km = 1.5 − 6 %. Strong systematic parameter relationships were found, and they agree with the predictions of diffusive filtering theory. Statistical results show that the seasonal variability of gravity wave activity had a summer‐maximum and winter‐minimum characteristics in the mesopause region over eastern China. A qualitative interpretation is proposed regarding the seasonal and geographic variability observed by the lidar chain, based on analysis of source properties and influences from background wind, which vary by season.