Modeling of scattering enhancement factor, f(RH), in Chiba using visibility and ground measurements

Material type: 文書・図像類

Author: LAGROSAS, Nofelほか

Publisher: Chiba University. Center for Environmental Remote Sensing

Publication date: 2016-11-21

Material Format: Digital

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Note (General)：: type:text[ABSTRACT]Monthly scattering enhancement factor, f(RH), is evaluated in Chiba in 2014. Hourly extinction coefficients at 875 nm are obtained ...

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Material Type: 文書・図像類
Title: Modeling of scattering enhancement factor, f(RH), in Chiba using visibility and ground measurements
Author/Editor: LAGROSAS, Nofel
TSUNEYOSHI, Tomoaki
MANAGO, Naohiro
KUZE, Hiroaki
Author Heading: LAGROSAS, Nofel
TSUNEYOSHI, Tomoaki
MANAGO, Naohiro
KUZE, Hiroaki
Publication, Distribution, etc.: Chiba University. Center for Environmental Remote Sensing
Publication Date: 2016-11-21
Publication Date (W3CDTF): 2016-11-21
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: 24
Volume: 24
Pages: 846-849
Text Language Code: eng
Target Audience: 一般
Note (General): type:text
[ABSTRACT]Monthly scattering enhancement factor, f(RH), is evaluated in Chiba in 2014. Hourly extinction coefficients at 875 nm are obtained from visibility meter operated at a Japan Meteorological Agency station located 2.5km south of Chiba University. Absorption coefficients at 875 nm are extrapolated from aethalometer measurements. Scattering coefficients are obtained as the difference between the extinction and absorption coefficients. These scattering coefficients in a month are averaged for every ambient relative humidity (RH). To obtain the dry scattering coefficient, a 7-point running average is applied to the visibility with RH to acquire the power-law fit of the visibility with RH. The scattering coefficient in the 0-30% RH range is the dry scattering coefficient obtained from the fit. The monthly f(RH) is the ratio of the scattering coefficients and the dry scattering coefficient in a month. A power-law is used to fit the f(RH) with RH. The winter months show increasing f(RH) with RH for RH>80%. November, December, January and February show that f(RH) starts to increase at around RH=75%. The high f(RH) values in February is considered as the effect of high RH in early morning. The change of f(RH) with RH is relatively insignificant in the summer months, although f(RH) rapidly changes with RH for RH>90%. This rapid increase can be explained as the effect of the presence of higher volume concentration of organics in the atmosphere, as revealed in the chemical component analysis previously conducted by our group.
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