Diurnal and Seasonal Cycles of Cloud Occurrences, Types, and Radiative Impact over West Africa

Diurnal and Seasonal Cycles of Cloud Occurrences, Types, and Radiative Impact over West Africa
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西非云发生、类型和辐射影响的日间和季节性周期

DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Ewan J. O’Connor
Ewan J. O’Connor
中科院分区：
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文献类型：
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作者：
D. Bouniol;F. Couvreux;P. Kamsu;Madeleine Leplay;F. Guichard;F. Favot;Ewan J. O’Connor

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摘要本研究重点关注西非观测到的云的出现和类型，这一主题既没有太多记录也没有量化。它利用了 2006 年通过大气辐射测量 (ARM) 移动设施在尼日尔尼亚美上空收集的数据。对从地面测量推断出的云特征进行了调查，重点关注其季节演变和昼夜周期。云分为四种类型：高层云、深对流云、浅对流云和中层云。强调了位于撒哈拉空气层顶部的后一种云的频繁出现。整个时期高层云无处不在，而浅对流云主要在季风核心期间明显可见。研究了每个云类别的昼夜周期及其季节演变。 CloudSat 和云-气溶胶激光雷达和红外探路者卫星观测 (CALIPSO) 数据用于证明这些...
AbstractThis study focuses on the occurrence and type of clouds observed in West Africa, a subject that has been neither much documented nor quantified. It takes advantage of data collected above Niamey, Niger, in 2006 with the Atmospheric Radiation Measurement (ARM) Mobile Facility. A survey of cloud characteristics inferred from ground measurements is presented with a focus on their seasonal evolution and diurnal cycle. Four types of clouds are distinguished: high-level clouds, deep convective clouds, shallow convective clouds, and midlevel clouds. A frequent occurrence of the latter clouds located at the top of the Saharan air layer is highlighted. High-level clouds are ubiquitous throughout the period whereas shallow convective clouds are mainly noticeable during the core of the monsoon. The diurnal cycle of each cloud category and its seasonal evolution are investigated. CloudSat and Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) data are used to demonstrate that these f...