Odin/OSIRIS limb observations of polar mesospheric clouds in 2001–2003
Odin/OSIRIS limb observations of polar mesospheric clouds in 2001–2003
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2001-2003 年极地中层云的 Odin/OSIRIS 临边观测
DOI：
10.1016/j.jastp.2005.08.004
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发表时间：
2006
影响因子：
1.9
通讯作者：
N. Lloyd
中科院分区：
文献类型：
--
作者：
S. Petelina;E. J. Llewellyn;D. Degenstein;N. Lloyd
分析了Odin/OSIRIS对南半球（SH）和北方（NH）极地中间层云（PMCs）的边缘散射太阳辐射的两年测量结果。给出了2001/2002和2002/2003年两个夏季偏南和2002和2003年两个夏季偏北的PMCs的时空分布、切向高度和亮度。Odin/OSIRIS的数据清楚地表明了PMC高度和亮度的年际和半球间差异。大多数SH云在70°S和82°S之间被探测到，最低PMC纬度在2001/2002年为61.4°S，在2002/2003年为54.7°S，在2001/2002年只有8个云在赤道70°S，而2002/2003年有33个云。在2002年，北半球云的观测时间较晚（约9天），总体上频率较低，其最大探测频率比2003年晚2周。2003年在60°N赤道方向观测到的PMC数量几乎是2002年的两倍。在NH PMC属性的年际变化一般低于在SH。在SH中的PMC检测频率比在NH中低约40%。南北半球平均PMC TA的差异在1.1和2.3km之间，NH云低于SH云。南北半球的平均PMC亮度差异约为1.35 -40%，NH云更亮。
Two years of Odin/OSIRIS measurements of the limb-scattered solar radiance are analyzed with respect to polar mesospheric clouds (PMCs) in both the southern hemisphere (SH) and the northern hemisphere (NH). Spatial and temporal distributions, tangent altitudes (TAs) and the brightness of PMCs during two SH summers of 2001/2002 and 2002/2003, and two NH summers of 2002 and 2003 are presented. The Odin/OSIRIS data clearly indicate inter-annual and inter-hemispheric differences in both PMC altitudes and brightness. Most of the SH clouds were detected between 70°S and 82°S, the lowest PMC latitude was 61.4°S in 2001/2002 and 54.7°S in 2002/2003, and only eight clouds were observed equatorward of 70°S in 2001/2002 compared to 33 clouds in 2002/2003. In 2002, NH clouds were observed later (by about 9 days), were in general less frequent and their maximum detection frequency was registered 2 weeks later than in 2003. The number of PMCs observed equatorward of 60°N in 2003 was almost twice as high as in 2002. The inter-annual variability of PMC properties in the NH was generally lower than in the SH. The PMC detection frequency in the SH was about 40% lower than in the NH. The inter-hemispheric difference in the mean PMC TA was between 1.1 and 2.3km with NH clouds lower than SH clouds. The inter-hemispheric difference in the mean PMC brightness was about ∼35–40% with the NH clouds being brighter.