Southeast pacific stratocumulus: high-frequency variability and mesoscale structures over San Félix Island
Southeast pacific stratocumulus: high-frequency variability and mesoscale structures over San Félix Island
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东南太平洋层积云：圣费利克斯岛的高频变化和中尺度结构
DOI：
10.1175/2009jamc2230.1
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发表时间：
2010
影响因子：
3
通讯作者：
P. Zuidema
中科院分区：
文献类型：
--
作者：
D. Painemal;R. Garreaud;J. Rutllant;P. Zuidema
摘要：对东南太平洋圣菲利克斯岛（SFI；南纬 26.5°，西经 80°）的层积云覆盖模式及其与毛毛雨的关系进行了表征。 2003 年，大约 65% 的中分辨率成像光谱辐射仪 (MODIS) 卫星图像中发现了小型封闭、大型封闭和开放单元。MODIS 图像与云高计和表面气象测量、人类对云类型和毛毛雨的观测以及 1 月至 6 月的大规模气象分析相结合。作者确定了两种毛毛雨状况：夏季（1 月至 3 月）天气静止状态，其特征是强反气旋、大闭孔和频繁的毛毛雨；秋季（4 月至 6 月）状态，其特征是反气旋较弱、小闭孔和开放孔，以及主要与天气活动相关的降水。大型闭孔比小型闭孔具有更高的平均云底和云顶，占积云的 45%...
Abstract Stratocumulus cloud cover patterns and their relationship to drizzle were characterized at San Felix Island (SFI; 26.5°S, 80°W) in the southeast Pacific Ocean. Small closed, large closed, and open cells were identified in about 65% of the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite images during 2003. The MODIS imagery was combined with ceilometer and surface meteorological measurements, human observations of cloud types and drizzle, and large-scale meteorological analyses for January through June. The authors identified two drizzle regimes: a synoptically quiescent summer (January–March) regime characterized by a strong anticyclone, large closed cells, and frequent drizzle, and an autumn (April–June) regime characterized by a weaker anticyclone, small closed cells and open cells, and precipitation that was mainly associated with synoptic activity. The large closed cells had higher mean cloud bases and tops than the small closed cells and accounted for 45% of the cumulus-under...