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On the cloud radiative effect for tropical high clouds overlying low clouds

Title
On the cloud radiative effect for tropical high clouds overlying low clouds
Authors
Kang H.Choi Y.-S.Hwang J.Kim H.-S.
Ewha Authors
최용상
SCOPUS Author ID
최용상scopus
Issue Date
2020
Journal Title
Geoscience Letters
ISSN
2196-4092JCR Link
Citation
Geoscience Letters vol. 7, no. 1
Publisher
Springer
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Since high and low clouds ubiquitously overlie the Tropical Western Pacific (TWP) region, the cloud radiative effect (CRE) cannot be influenced by either high or low clouds, but by combinations of the clouds. This study investigates the CRE of multi-layered clouds in TWP via a radiative transfer model, Streamer. We assumed that multi-layered clouds are composed of full coverage of high clouds overlying low clouds with fractional coverage. The simulation results show that low clouds readily change CREs from positive to negative in the case of optically thin high clouds, even if the fraction of low clouds takes 10% of that of high clouds. Also, various combinations of physical properties of multi-layered high and low clouds allow more CRE variability (− 253.76 to 93.10 W m−2) than single-layered clouds do (− 101.62 to 96.95 W m−2). Even in the same conditions (total column cloud optical thickness = 15 and high cloud top pressure = 200 hPa), the multi-layer clouds have various CREs from − 180.55 to 45.64 W m−2, while the single-layer high clouds − 2.00 W m−2. These findings are also comparable with satellite observations from CERES and CALIPSO. The present study suggests that considerable uncertainty of radiative effects of high clouds over TWP can attribute to low clouds below high clouds. © 2020, The Author(s).
DOI
10.1186/s40562-020-00156-6
Appears in Collections:
엘텍공과대학 > 기후·에너지시스템공학전공 > Journal papers
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