DOI: 10.1175/JCLI-D-14-00287.1
Scopus记录号: 2-s2.0-84919667053
论文题名: Observed Southern Ocean cloud properties and shortwave reflection. Part I: Calculation of SW flux from observed cloud properties
作者: Mccoy D.T. ; Hartmann D.L. ; Grosvenor D.P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 23 起始页码: 8836
结束页码: 8857
语种: 英语
Scopus关键词: Clouds
; Graphic methods
; Ice
; Image reconstruction
; Optical properties
; Radiometers
; Satellite imagery
; Sensitivity analysis
; Solar radiation
; Spectrometers
; Statistical methods
; Sun
; Cloud liquid water path
; Ice cloud properties
; Moderate resolution imaging spectroradiometer
; Multiangle imaging spectroradiometer
; Radiative transfer model
; Short-wave radiation
; University of Wisconsin
; Vertical structures
; Liquids
; cloud
; cloud water
; CloudSat
; MISR
; MODIS
; radiative transfer
; seasonal variation
; shortwave radiation
; solar radiation
; Southern Ocean
英文摘要: The sensitivity of the reflection of shortwave radiation over the Southern Ocean to the cloud properties there is estimated using observations from a suite of passive and active satellite instruments in combination with radiative transfer modeling. A composite cloud property observational data description is constructed that consistently incorporates mean cloud liquid water content, ice water content, liquid and ice particle radius information, vertical structure, vertical overlap, and spatial aggregation of cloud water as measured by optical depth versus cloud-top pressure histograms. The observational datasets used are Moderate Resolution Imaging Spectroradiometer (MODIS) effective radius filtered to mitigate solar zenith angle bias, the Multiangle Imaging Spectroradiometer (MISR) cloud-top height-optical depth (CTH-OD) histogram, the liquid water path from the University of Wisconsin dataset, and ice cloud properties from CloudSat. This cloud database is used to compute reflected shortwave radiation as a function of month and location over the ocean from 40° to 60°S, which compares well with observations of reflected shortwave radiation. This calculation is then used to test the sensitivity of the seasonal variation of shortwave reflection to the observed seasonal variation of cloud properties. Effective radius decreases during the summer season, which results in an increase in reflected solar radiation of 4-8 W m-2 during summer compared to what would be reflected if the effective radius remained constant at its annual-mean value. Summertime increases in low cloud fraction similarly increase the summertime reflection of solar radiation by 9-11 W m-2. In-cloud liquid water path is less in summertime, causing the reflected solar radiation to be 1-4 W m-2 less. © 2014 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51233
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Mccoy D.T.,Hartmann D.L.,Grosvenor D.P.. Observed Southern Ocean cloud properties and shortwave reflection. Part I: Calculation of SW flux from observed cloud properties[J]. Journal of Climate,2014-01-01,27(23)