The northward march of summer low cloudiness along the California coast
The northward march of summer low cloudiness along the California coast
复制标题
DOI：
10.1002/2015gl067081
复制
发表时间：
2016-02-16
影响因子：
5.2
通讯作者：
Cayan, Daniel R.
中科院分区：
文献类型：
--
作者：
Clemesha, Rachel E. S.;Gershunov, Alexander;Cayan, Daniel R.
一种新的卫星低云反演揭示了夏季加州沿海低云（CLC）丰富的空间纹理和连贯的时空传播。在整个地区，CLC 在 5 月至 9 月期间最强，但在夏季有相当大的每月变化。平均而言，六月份南加州和墨西哥巴哈北部海岸的云量最高，而七月北加州海岸的云量最高。在整个夏季，CLC峰值的核心沿着加利福尼亚州沿海向北迁移，在7月底/8月初到达最北端，然后在减弱的同时后退。 CLC气候结构的时间和运动与对流层低层稳定性及其组成部分——海面温度和700hPa位温的夏季演化有关。 CLC 峰值的季节时间与夏季峰值温度大致一致，这意味着 CLC 沿加州北海岸的热调节能力最强。
A new satellite-derived low cloud retrieval reveals rich spatial texture and coherent space-time propagation in summertime California coastal low cloudiness (CLC). Throughout the region, CLC is greatest during May-September but has considerable monthly variability within this summer season. On average, June is cloudiest along the coast of southern California and northern Baja, Mexico, while July is cloudiest along northern California's coast. Over the course of the summer, the core of peak CLC migrates northward along coastal California, reaching its northernmost extent in late July/early August, then recedes while weakening. The timing and movement of the CLC climatological structure is related to the summer evolution of lower tropospheric stability and both its component parts, sea surface temperature and potential temperature at 700hPa. The roughly coincident seasonal timing of peak CLC with peak summertime temperatures translates into the strongest heat-modulating capacity of CLC along California's north coast.