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The northward march of summer low cloudiness along the California coast
Author(s) -
Clemesha Rachel E. S.,
Gershunov Alexander,
Iacobellis Sam F.,
Williams A. Park,
Cayan Daniel R.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl067081
Subject(s) - climatology , cloud cover , troposphere , satellite , sea surface temperature , oceanography , geology , environmental science , cloud computing , aerospace engineering , computer science , engineering , operating system
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 700 hPa. 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.