Nocturnal convective cloud formation under clear‐sky conditions at the eastern Andes of south Ecuador
Nocturnal convective cloud formation under clear‐sky conditions at the eastern Andes of south Ecuador
复制标题
厄瓜多尔南部安第斯山脉东部晴空条件下夜间对流云的形成
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
J. Bendix
中科院分区：
文献类型：
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作者：
K. Trachte;R. Rollenbeck;J. Bendix
[1]用数值模式研究了厄瓜多尔南部安第斯山脉东部和邻近的秘鲁亚马孙盆地夜间对流云的形成。它们的形成预计将是安第斯地形夜间下坡水流的相互作用过程，在目标地区形成一个凹形排水系统。卫星图像既用于识别夜间冷云现象的样本病例，也用于验证模拟结果。根据红外温度对云型进行了区分。对这些数据的比较表明，尽管模拟的星团要小得多，但目标区域出现了冷云屏蔽。对流单体发展的进一步分析证实了假定的潜在过程。通过星系团的横截面可以识别出低层大气中的强流，可能是一种排泄流，与强水汽辐合有关。根据它们的特征和表面能通量作为热诱导下坡流动的驱动力，证实了它们的存在。
[1] The formation of nocturnal convective clouds at the eastern Andes of south Ecuador and the adjacent Peruvian Amazon basin was investigated in a numerical model study. Their formation is expected to be an interactive procedure of nocturnal downslope flows in the Andean terrain, which forms a concave drainage system in the target area. Satellite imagery were used for both the identification of a sample case with a nocturnal cold cloud appearance and for the verification of the simulated results. The cloud patterns were distinguished on the basis of IR temperatures. A comparison of the data demonstrated the occurrence of a cold cloud shield in the target area, although the modeled cluster is significantly smaller. Further analysis of the development of the convective cells confirmed the assumed underlying processes. A strong current in the lower atmosphere, presumably a drainage flow, was recognizable in association with strong moisture convergence using a cross section through the cluster. Their presence was confirmed on the basis of their characteristic features and the surface energy fluxes as the driving force for thermally induced downslope flows.