Cloud Cover over the South Pole from Visual Observations, Satellite Retrievals, and Surface-Based Infrared Radiation Measurements
Cloud Cover over the South Pole from Visual Observations, Satellite Retrievals, and Surface-Based Infrared Radiation Measurements
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DOI：
10.1175/jcli4005.1
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发表时间：
2007-02
影响因子：
4.9
通讯作者：
M. Town;V. Walden;S. Warren
中科院分区：
文献类型：
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作者：
M. Town;V. Walden;S. Warren
本文从五个不同的资料来源提出了对南极上空云量的估计：常规目视观测（1957-2004; Cvis），基于表面的光谱红外（IR）数据（2001年; CPAERI），基于表面的宽带IR数据（1994-2003; Cpyr），扩展高级甚高分辨率辐射计（AVHRR）极地探路者（APP-x）数据集（1994-99; CAPP-x）和国际卫星云气候学项目（ISCCP）数据集（1994-2003; CISCCP）。云量的季节性变化范围从短暂的夏季的45%-50%到相对恒定的冬季的55%-65%。研究了Cpyr与2米温度、10米风速风向和长波辐射的关系。结果表明，云温暖的表面在所有季节，0.5-1 K在夏季和3-4 K在冬季。年长波云辐射强迫为18 W m−2的下沉辐射和10 W m−2的净辐射。云覆盖数据集相互比较的时间段，其中…
Abstract Estimates of cloud cover over the South Pole are presented from five different data sources: routine visual observations (1957–2004; Cvis), surface-based spectral infrared (IR) data (2001; CPAERI), surface-based broadband IR data (1994–2003; Cpyr), the Extended Advanced Very High Resolution Radiometer (AVHRR) Polar Pathfinder (APP-x) dataset (1994–99; CAPP-x), and the International Satellite Cloud Climatology Project (ISCCP) dataset (1994–2003; CISCCP). The seasonal cycle of cloud cover is found to range from 45%–50% during the short summer to a relatively constant 55%–65% during the winter. Relationships between Cpyr and 2-m temperature, 10-m wind speed and direction, and longwave radiation are investigated. It is shown that clouds warm the surface in all seasons, 0.5–1 K during summer and 3–4 K during winter. The annual longwave cloud radiative forcing is 18 W m−2 for downwelling radiation and 10 W m−2 for net radiation. The cloud cover datasets are intercompared during the time periods in whic...