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  1. 139 大気海洋研究所
  2. 10 気候システム研究系
  3. 1391010 学術雑誌
  1. 0 資料タイプ別
  2. 10 学術雑誌論文
  3. 014 自然科学

The Effective Cloud Fraction of Broken Clouds Obtained by Multistream Radiative Transfer. Part 1: Longwave Radiation

http://hdl.handle.net/2261/51869
http://hdl.handle.net/2261/51869
e0fd3790-32b2-45c1-88dd-bf8917280a75
名前 / ファイル ライセンス アクション
Nakajima2001JAS_H24P69.pdf Nakajima2001JAS_H24P69.pdf (303.3 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2017-01-10
タイトル
タイトル The Effective Cloud Fraction of Broken Clouds Obtained by Multistream Radiative Transfer. Part 1: Longwave Radiation
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
著者 Masunaga, Hirohiko

× Masunaga, Hirohiko

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Masunaga, Hirohiko

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Nakajima, Teruyuki

× Nakajima, Teruyuki

WEKO 3357

Nakajima, Teruyuki

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著者所属
著者所属 Earth Observation Research Center
著者所属
著者所属 Center for Climate System Research, University of Tokyo
抄録
内容記述タイプ Abstract
内容記述 The influence of broken clouds on radiative flux has provided a major source of uncertainty in radiative transfer models of the atmosphere because plane-parallel approximations are assumed in most of the current atmospheric models, where horizontal inhomogeneity cannot be adequately taken into account. In this paper, effects by cloud inhomogeneity on longwave radiation fields are investigated, using a simple model of a cloud array that consists of identical cuboids following some past studies. In contrast to past work that adopted simplified formulations of radiative transfer, multistream radiative transfer is considered to obtain the exact solutions of radiative flux, which enable us to consider semitransparent clouds as well as optically thick clouds in desirable accuracy. Applicability to semitransparent clouds is important because cirrus clouds, which are considered to play significant roles for longwave radiation, are often semitransparent to infrared radiation. The computational results show that the empirical formula previously derived by Harshvardhan and Weinman systematically underestimates the effective cloud fraction. An alternative formula is proposed for the effective cloud fraction to supply a better fit to the exact solution of radiative flux. Furthermore, new formulas are derived to approximate the exact solutions including the dependence on the optical thickness of clouds. They are useful to convert plane-parallel flux to 3D flux passing through broken clouds, either for optically thick or thin clouds.
書誌情報 Journal of the atmospheric sciences

巻 58, 号 16, p. 2455-2467, 発行日 2001-08-15
ISSN
収録物識別子タイプ ISSN
収録物識別子 00224928
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA00693875
DOI
識別子タイプ DOI
関連識別子 info:doi/10.1175/1520-0469(2001)058<2455:TECFOB>2.0.CO;2
権利
権利情報 © Copyright 2001 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyright@ametsoc.org.
日本十進分類法
主題Scheme NDC
主題 451
出版者
出版者 American Meteorological Society
異版である
関連タイプ isVersionOf
識別子タイプ URI
関連識別子 http://doi.org/10.1175/1520-0469(2001)058<2455:TECFOB>2.0.CO;2
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