Recent decade variations of aerosol optical properties and radiative forcing inferred from ground-based broadband radiometers at Tsukuba

Material type: 文書・図像類

Author: KUDO, Reiほか

Publisher: Chiba University. Center for Environmental Remote Sensing

Publication date: 2008-11-13

Material Format: Digital

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Note (General)：: type:text[ABSTRACT]Global average trend in solar radiative flux at the Earth's surface increases since the mid 1980's ("global brightening"). This is ...

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Material Type: 文書・図像類
Title: Recent decade variations of aerosol optical properties and radiative forcing inferred from ground-based broadband radiometers at Tsukuba
Author/Editor: KUDO, Rei
UCHIYAMA, Akihiro
YAMAZAKI, Akihiro
KOBAYASHI, Eriko
Author Heading: KUDO, Rei
UCHIYAMA, Akihiro
YAMAZAKI, Akihiro
KOBAYASHI, Eriko
Publication, Distribution, etc.: Chiba University. Center for Environmental Remote Sensing
Publication Date: 2008-11-13
Publication Date (W3CDTF): 2008-11-13
Periodical title: Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集
No. or year of volume/issue: 14
Volume: 14
Pages: 14-17
Text Language Code: eng
Target Audience: 一般
Note (General): type:text
[ABSTRACT]Global average trend in solar radiative flux at the Earth's surface increases since the mid 1980's ("global brightening"). This is seen under both the cloudy and cloudless conditions. The aerosol change is one of the most important factors for the radiative flux change at the surface. The aerosol optical thickness is related to the magnitude of the surface radiative forcing, and the aerosol single scattering albedo influences the slope of the aerosol radiative forcing. Therefore, the optical thickness and single scattering albedo are important parameters for the understanding of the aerosol radiative forcing change. We have developed a new method to estimate the aerosol optical parameters from the ground-based broadband radiometers. The method assumes the 4 aerosol components, and estimates the aerosol optical thickness, single scattering albedo, and asymmetry factor from the direct and diffuse fluxes in VIS and NIR regions. We applied this method to the recent decade observations (April 1998 to May 2008) at Tsukuba, Japan. The daily mean global flux in cloudless condition increased by 0.47 Wm-2 per year. The daily mean aerosol radiative forcing decreased by 0.55 Wm-2 per year. The aerosol radiative forcing tends to decrease, and the radiative flux tends to increase at Tsukuba during 1998-2008. On the other hands, the aerosol optical thickness had no tendency, but the aerosol single scattering albedo and asymmetry factor increased by 0.011 and 0.003 per year. The recent decadal decrease of the aerosol radiative forcing was caused by the aerosol absorptive and forward scattering characters.
Format (IMT): application/pdf
Source: https://opac.ll.chiba-u.jp/da/curator/106611/ceresIntlSympo-14-P014.pdf
https://opac.ll.chiba-u.jp/da/curator/106611/ceresIntlSympo-14-P014.pdf
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 千葉大学 : 千葉大学学術成果リポジトリ