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DOI | 10.5194/acp-17-2359-2017 |
Directional, horizontal inhomogeneities of cloud optical thickness fields retrieved from ground-based and airbornespectral imaging | |
Schaefer, Michael1; Bierwirth, Eike1,3; Ehrlich, Andre1; Jaekel, Evelyn1; Werner, Frank2; Wendisch, Manfred1 | |
2017-02-15 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; USA |
英文摘要 | Clouds exhibit distinct horizontal inhomogeneities of their optical and microphysical properties, which complicate their realistic representation in weather and climate models. In order to investigate the horizontal structure of cloud inhomogeneities, 2-D horizontal fields of optical thickness (tau) of subtropical cirrus and Arctic stratus are investigated with a spatial resolution of less than 10 m. The 2-D tau-fields are derived from (a) downward (transmitted) solar spectral radiance measurements from the ground beneath four subtropical cirrus and (b) upward (reflected) radiances measured from aircraft above 10 Arctic stratus. The data were collected during two field campaigns: (a) Clouds, Aerosol, Radiation, and tuRbulence in the trade wind regime over BArbados (CARRIBA) and (b) VERtical Distribution of Ice in Arctic clouds (VERDI). One-dimensional and 2-D autocorrelation functions, as well as power spectral densities, are derived from the retrieved tau-fields. The typical spatial scale of cloud inhomogeneities is quantified for each cloud case. Similarly, the scales at which 3-D radiative effects influence the radiance field are identified. In most of the investigated cloud cases considerable cloud inhomogeneities with a prevailing directional structure are found. In these cases, the cloud inhomogeneities favour a specific horizontal direction, while across this direction the cloud is of homogeneous character. The investigations reveal that it is not sufficient to quantify horizontal cloud inhomogeneities using 1-D inhomogeneity parameters; 2-D parameters are necessary. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000395130600001 |
WOS关键词 | BOUNDARY-LAYER CLOUDS ; INDEPENDENT PIXEL APPROXIMATION ; RADIATIVE-TRANSFER ; MARINE STRATOCUMULUS ; ICE ; CIRRUS ; ALBEDO |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/30652 |
专题 | 地球科学 |
作者单位 | 1.Univ Leipzig, Leipzig Inst Meteorol, Leipzig, Germany; 2.Univ Maryland, Joint Ctr Earth Syst Technol, 5523 Res Pk Dr 320, Baltimore, MD 21228 USA; 3.PIER ELECT GmbH, Nassaustr 33-35, D-65719 Hofheim, Germany |
推荐引用方式 GB/T 7714 | Schaefer, Michael,Bierwirth, Eike,Ehrlich, Andre,et al. Directional, horizontal inhomogeneities of cloud optical thickness fields retrieved from ground-based and airbornespectral imaging[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(3). |
APA | Schaefer, Michael,Bierwirth, Eike,Ehrlich, Andre,Jaekel, Evelyn,Werner, Frank,&Wendisch, Manfred.(2017).Directional, horizontal inhomogeneities of cloud optical thickness fields retrieved from ground-based and airbornespectral imaging.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(3). |
MLA | Schaefer, Michael,et al."Directional, horizontal inhomogeneities of cloud optical thickness fields retrieved from ground-based and airbornespectral imaging".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.3(2017). |
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