Stratocumulus cloud clearings: statistics from satellites, reanalysis models, and airborne measurements

Atmospheric Chemistry and Physics
Hossein DadashazarArmin Sorooshian

Abstract

This study provides a detailed characterization of stratocumulus clearings off the US West Coast using remote sensing, reanalysis, and airborne in situ data. Ten years (2009-2018) of Geostationary Operational Environmental Satellite (GOES) imagery data are used to quantify the monthly frequency, growth rate of total area (GRArea), and dimensional characteristics of 306 total clearings. While there is interannual variability, the summer (winter) months experienced the most (least) clearing events, with the lowest cloud fractions being in close proximity to coastal topographical features along the central to northern coast of California, including especially just south of Cape Mendocino and Cape Blanco. From 09:00 to 18:00 (PST), the median length, width, and area of clearings increased from 680 to 1231, 193 to 443, and ~ 67000 to ~ 250000km2, respectively. Machine learning was applied to identify the most influential factors governing the GRArea of clearings between 09:00 and 12:00PST, which is the time frame of most rapid clearing expansion. The results from gradient-boosted regression tree (GBRT) modeling revealed that air temperature at 850 hPa (T850), specific humidity at 950 hPa (q950), sea surface temperature (SST), and an...Continue Reading

References

Apr 22, 2003·Statistics in Medicine·Jerome H Friedman, Jacqueline J Meulman
Apr 10, 2008·The Journal of Animal Ecology·J ElithT Hastie
Jan 1, 2017·IEEE Transactions on Geoscience and Remote Sensing : a Publication of the IEEE Geoscience and Remote Sensing Society·Steven PlatnickJérôme Riedi
Apr 16, 2018·Journal of Geophysical Research. Atmospheres : JGR·Alexander B MacDonaldArmin Sorooshian
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Dec 5, 2020·Journal of Geophysical Research. Atmospheres : JGR·Ali Hossein MardiArmin Sorooshian
Aug 31, 2018·Atmospheric Measurement Techniques·Ewan CrosbieBruce Anderson

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scikit
PD GRArea
GOCART
FASE
MATLAB
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