Brown carbon light absorption over an urban environment in northern peninsular Southeast Asia

doi:10.1016/j.envpol.2021.116735

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標題:	Brown carbon light absorption over an urban environment in northern peninsular Southeast Asia
作者:	Pani, Shantanu Kumar Lin, Neng-Huei Griffith, Stephen M. Chantara, Somporn Lee, Chung-Te Thepnuan, Duangduean Tsai, Ying, I
貢獻者:	Natl Cent Univ, Dept Atmospher Sci Natl Cent Univ, Ctr Environm Monitoring & Technol Chiang Mai Univ, Fac Sci, Environm Sci Res Ctr Chiang Mai Univ, Fac Sci, Dept Chem, Environm Chem Res Lab Natl Cent Univ, Grad Inst Environm Engn Chia Nan Univ Pharm & Sci, Dept Environm Engn & Sci Chiang Mai Rajabhat Univ, Fac Sci & Technol, Dept Chem
關鍵字:	Biomass burning Chiang Mai Absorption Angstrom exponent Mass absorption cross-section Imaginary part of refractive index
日期:	2021
上傳時間:	2023-11-11 11:55:34 (UTC+8)
出版者:	ELSEVIER SCI LTD
摘要:	Light-absorbing organic carbon (or brown carbon, BrC) has been recognized as a critical driver in regional-to-global climate change on account of its significant contribution to light absorption. BrC sources vary from primary combustion processes (burning of biomass, biofuel, and fossil fuel) to secondary formation in the atmosphere. This paper investigated the light-absorbing properties of BrC such as site-specific mass absorption cross-section (MAC(BrC)), absorption Angstrom exponent (AAE(BrC)), and the absorbing component of the refractive index (k(BrC)) by using light absorption measurements from a 7-wavelength aethalometer over an urban environment of Chiang Mai, Thailand in northern peninsular Southeast Asia (PSEA), from March to April 2016. The contribution of BrC to total aerosol absorption (mean +/- SD) was 46 +/- 9%, 29 +/- 7%, 24 +/- 6%, 20 +/- 4%, and 15 +/- 3% at 370, 470, 520, 590, and 660 nm, respectively, highlighting the significant influence of BrC absorption on the radiative imbalance over northern PSEA. Strong and significant associations between BrC light absorption and biomass-burning (BB) organic tracers highlighted the influence of primary BB emissions. The median MAC(BrC) and k(BrC) values at 370 nm were 2.4 m(2) g(-1) and 0.12, respectively. The fractional contribution of solar radiation absorbed by BrC relative to BC (mean +/- SD) in the 370-950 nm range was estimated to be 34 +/- 7%, which can significantly influence the regional radiation budget and consequently atmospheric photochemistry. This study provides valuable information to understand BrC absorption over northern PSEA and can be used in model simulations to reassess the regional climatic impact with greater accuracy. (C) 2021 Elsevier Ltd. All rights reserved.
關聯:	ENVIRON POLLUT, v.276, 116735
顯示於類別:	[環境工程與科學系(所)] 期刊論文

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