Polar vortex evolution during Northern Hemispheric winter 2004/05
Polar vortex evolution during Northern Hemispheric winter 2004/05
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DOI：
10.5194/angeo-25-1279-2007
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发表时间：
2007-06
影响因子：
1.9
通讯作者：
T. Chshyolkova;A. Manson;C. Meek;T. Aso;S. Avery;C. Hall;W. Hocking;K. Igarashi;C. Jacobi;N. Makarov;N. Mitchell;Y. Murayama;W. Singer;D. Thorsen;M. Tsutsumi
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文献类型：
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作者：
T. Chshyolkova;A. Manson;C. Meek;T. Aso;S. Avery;C. Hall;W. Hocking;K. Igarashi;C. Jacobi;N. Makarov;N. Mitchell;Y. Murayama;W. Singer;D. Thorsen;M. Tsutsumi
抽象的。作为CAWSES计划“大气波对冬季极涡（0-100 km）的影响”项目的一部分，分析了12个地点的流星和中频雷达以及MetO（英国气象局）全球同化场的数据。2004/05年北方冬季的第一次活动。平流层状态已被描述使用传统的纬向平均参数以及Q诊断，它允许考虑的纵向变化。2004/05年冬季平流层较冷，冬季大部分时间极涡相对较强，12月底和1月底极涡扰动相对较弱。对于这个冬天最强的变形与分裂的极涡在平流层下部的观察在2月底。这里的结果表明，在不同台站的平流层和中间层数据集中，存在明显的纬向和经向差异。偏东风较弱，行星波周期的振荡在更向极的站有较小的振幅。因此，观测到的与平流层扰动有关的纬向中层风逆转的发生、时间和大小取决于当地平流层的条件。总的来说，与往年相比，2004/05年冬季平流层和中层高度的行星波活动较弱。
Abstract. As a part of the project "Atmospheric Wave Influences upon the Winter Polar Vortices (0–100 km)" of the CAWSES program, data from meteor and Medium Frequency radars at 12 locations and MetO (UK Meteorological Office) global assimilated fields have been analyzed for the first campaign during the Northern Hemispheric winter of 2004/05. The stratospheric state has been described using the conventional zonal mean parameters as well as Q-diagnostic, which allows consideration of the longitudinal variability. The stratosphere was cold during winter of 2004/05, and the polar vortex was relatively strong during most of the winter with relatively weak disturbances occurring at the end of December and the end of January. For this winter the strongest deformation with the splitting of the polar vortex in the lower stratosphere was observed at the end of February. Here the results show strong latitudinal and longitudinal differences that are evident in the stratospheric and mesospheric data sets at different stations. Eastward winds are weaker and oscillations with planetary wave periods have smaller amplitudes at more poleward stations. Accordingly, the occurrence, time and magnitude of the observed reversal of the zonal mesospheric winds associated with stratospheric disturbances depend on the local stratospheric conditions. In general, compared to previous years, the winter of 2004/05 could be characterized by weak planetary wave activity at stratospheric and mesospheric heights.