Gravity wave momentum fluxes in the MLT—Part I: Seasonal variation at Collm (51.3°N, 13.0°E)
Gravity wave momentum fluxes in the MLT—Part I: Seasonal variation at Collm (51.3°N, 13.0°E)
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DOI：
10.1016/j.jastp.2010.07.012
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发表时间：
2011-06
影响因子：
1.9
通讯作者：
Manja Placke;G. Stober;C. Jacobi
中科院分区：
文献类型：
--
作者：
Manja Placke;G. Stober;C. Jacobi
通过使用Hocking（2005年）提出的方法，从2004年至2009年期间在德国科尔姆（51.3°N，13.0°E）进行的全天干涉流星雷达风测量得出了中层和低热层的风方差和重力波动量通量。我们提出了长期平均月平均方差和动量通量的垂直廓线。重力波方差在90 km高度附近呈半年振荡，一般随高度增加而增大。一个例外是夏季的几个月，在那里测量到的最大值约为88公里，振幅在该高度以上下降。动量通量和平均背景风的比较强调重力波和背景环流之间的耦合。3-各季的月平均风场和风场方差的年际变率冬季比夏季强，表明中层风场对重力波的过滤作用是造成这种年际变率的原因。
By using a method presented by Hocking (2005), wind variances and gravity wave momentum fluxes in the mesosphere and lower thermosphere have been derived from all-sky interferometric meteor radar wind measurements at Collm, Germany (51.3°N, 13.0°E), during 2004 through 2009. We present vertical profiles of long-term mean monthly mean variances and momentum fluxes. Gravity wave variances show a semi-annual oscillation around 90 km altitude, and generally increase with height. An exception are the summer months where the maximum is measured around 88km and amplitudes are decreasing above that height. A comparison of momentum fluxes and mean background winds emphasizes the coupling between gravity waves and the background circulation. 3-monthly means of wind and wind variance for individual seasons show stronger interannual variability in winter than in summer, and an indication for mesosphere wind filtering of gravity waves being responsible for this variability.