DOI: 10.1002/2017JD027232
Scopus记录号: 2-s2.0-85040994807
论文题名: Cirrus Cloud Optical Thickness and Effective Diameter Retrieved by MODIS: Impacts of Single Habit Assumption, 3-D Radiative Effects, and Cloud Inhomogeneity
作者: Zhou Y. ; Sun X. ; Mielonen T. ; Li H. ; Zhang R. ; Li Y. ; Zhang C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 2 起始页码: 1195
结束页码: 1210
语种: 英语
英文关键词: 3-D radiative effects
; cirrus
; cloud inhomogeneity
; cloud optical thickness
; effective diameter
; single habit assumption
Scopus关键词: cirrus
; cloud
; cloud cover
; diameter
; error analysis
; geometry
; ice
; methodology
; MODIS
; optical depth
; pixel
; radiative forcing
; satellite imagery
; scattering
; shape
; three-dimensional modeling
英文摘要: For inhomogeneous cirrus clouds, cloud optical thickness (COT) and effective diameter (De) provided by the Moderate Resolution Imaging Spectrometer (MODIS) Collection 6 cloud products are associated with errors due to the single habit assumption (SHA), independent pixel assumption (IPA), photon absorption effect (PAE), and plane-parallel assumption (PPA). SHA means that every cirrus cloud is assumed to have the same shape habit of ice crystals. IPA errors are caused by three-dimensional (3D) radiative effects. PPA and PAE errors are caused by cloud inhomogeneity. We proposed a method to single out these different errors. These errors were examined using the Spherical Harmonics Discrete Ordinate Method simulations done for the MODIS 0.86 μm and 2.13 μm bands. Four midlatitude and tropical cirrus cases were studied. For the COT retrieval, the impacts of SHA and IPA were especially large for optically thick cirrus cases. SHA errors in COT varied distinctly with scattering angles. For the De retrieval, SHA decreased De under most circumstances. PAE decreased De for optically thick cirrus cases. For the COT and De retrievals, the dominant error source was SHA for overhead sun whereas for oblique sun, it could be any of SHA, IPA, and PAE, varying with cirrus cases and sun-satellite viewing geometries. On the domain average, the SHA errors in COT (De) were within −16.1%–42.6% (−38.7%–2.0%), whereas the 3-D radiative effects- and cloud inhomogeneity-induced errors in COT (De) were within −5.6%–19.6% (−2.9%–8.0%) and −2.6%–0% (−3.7%–9.8%), respectively. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114683
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: College of Meteorology and Oceanography, National University of Defense Technology, Nanjing, China; Finnish Meteorological Institute, Kuopio, Finland; State Key Laboratory of Aerospace Dynamics, Xi'an, China; Northwest Institute of Nuclear Technology, Xi'an, China
Recommended Citation:
Zhou Y.,Sun X.,Mielonen T.,et al. Cirrus Cloud Optical Thickness and Effective Diameter Retrieved by MODIS: Impacts of Single Habit Assumption, 3-D Radiative Effects, and Cloud Inhomogeneity[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(2)