The effects of atmospheric waves on the amounts of polar stratospheric clouds
The effects of atmospheric waves on the amounts of polar stratospheric clouds
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DOI：
10.5194/acp-11-11535-2011
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发表时间：
2011-11
影响因子：
6.3
通讯作者：
M. Kohma;Kaoru Sato
中科院分区：
文献类型：
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作者：
M. Kohma;Kaoru Sato
抽象的。利用CALIPSO、COSMIC和Aura MLS观测资料和再分析资料，对2008年南冬和2007/2008年北冬大气波动与极地平流层云的关系进行了定量分析。在南半球PSC发生频率的时间剖面表明，PSC频率不是区域均匀的，PSC频率高的区域以不同的速度从背景纬向风向东传播。这些特征表明大气波对PSC行为有显著影响。其次，利用HNO 3和H2O混合比计算了PSC存在的三个温度阈值.其中，基于TSTS（三元溶液过冷阈值）的PSC频率估计在数量、空间和时间变化上与观测结果最为雅阁，特别是在55° S-70° S和55° N-85° N纬度范围内。此外，行星波，天气尺度波和重力波对PSC面积范围的影响分别使用基于T STS的PSC估计进行了检查。分析55° S-70° S的纬度范围，因为基于T STS的估计与高纬度的观测不一致（
Abstract. A quantitative analysis on the relationship between atmospheric waves and polar stratospheric clouds (PSCs) in the 2008 austral winter and the 2007/2008 boreal winter is made using CALIPSO, COSMIC and Aura MLS observation data and reanalysis data. A longitude-time section of the frequency of PSC occurrence in the Southern Hemisphere indicates that PSC frequency is not regionally uniform and that high PSC frequency regions propagate eastward at different speeds from the background zonal wind. These features suggest a significant influence of atmospheric waves on PSC behavior. Next, three temperature thresholds for PSC existence are calculated using HNO 3 and H 2 O mixing ratios. Among the three, the T STS (a threshold for super cooled ternary solution)-based estimates of PSC frequency accord best with the observations in terms of the amount, spatial and temporal variation, in particular, for the latitude ranges of 55° S–70° S and 55° N–85° N. Moreover, the effects of planetary waves, synoptic-scale waves and gravity waves on PSC areal extent are separately examined using the T STS -based PSC estimates. The latitude range of 55° S–70° S is analyzed because the T STS -based estimates are not consistent with observations at higher latitudes (