Long-term variability of mid-latitude mesosphere-lower thermosphere winds over Collm (51°N, 13°E)

Long-term variability of mid-latitude mesosphere-lower thermosphere winds over Collm (51°N, 13°E)
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科尔姆(51°N,13°E)上空中纬度中间层-低热层风的长期变化

DOI:
10.1016/j.jastp.2015.05.006
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发表时间:
2015
影响因子:
1.9
通讯作者:
A. Krug
A. Krug
中科院分区:
地球科学4区
文献类型:
--
作者:
Jacobi;F. Lilienthal;C. Geiÿler;A. Krug

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从流星雷达2004年至今获得的中纬度中层/低热层风的雷达观测和1979-2008年的低频漂移方法相结合,获得了90公里高度中层/低热层动力学的均匀长期数据集。对数据进行分析,以获得过去三十年盛行风的趋势。在季节时间尺度上,纬向风显示出正的趋势,更多的西风全年,而纬向风的趋势是负的,在秋季/冬季和春季/夏季的积极。1995年以后夏季盛行风的纬向和纬向趋势都有变化的趋势。使用一个数值环流模式,与现实的臭氧和二氧化碳场和对流层/平流层低层环流取自ERA再分析,所观察到的趋势变化,可以复制定性。根据该模型,MLT风的趋势主要是由于对流层和平流层下部动力学变化的影响。
Radar observations of mesosphere/lower thermosphere (MLT) winds at middle latitudes obtained from meteor radar 2004–date and the low-frequency drift method 1979–2008 have been combined to obtain a homogeneous long-term data set of MLT dynamics at 90 km altitude. The data are analyzed to obtain tendencies of prevailing winds during the last three decades. On a seasonal time scale, the zonal winds show positive trends towards more westerly winds throughout the year, while the meridional wind trends are negative in autumn/winter and positive in spring/summer. There is a tendency that the trends of both zonal and meridional summer prevailing winds are changing after 1995. Using a numerical circulation model with realistic ozone and carbon dioxide fields and with tropospheric/lower stratospheric circulation taken from ERA reanalyses, the observed trend changes can be reproduced qualitatively. The MLT wind trends are, according to the model, mainly due to the influence of changes in tropospheric and lower stratospheric dynamics.
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发表时间: 2010-11
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