基于在线观测的大气PM<sub>2.5</sub>中棕色碳吸光贡献估算

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摘要使用三波长光声黑碳光度计（PASS-3）和气溶胶质谱仪（AMS），于2011年秋季在浙江城市点金华和2014年夏季河北区域点望都进行了大气在线观测，采用改进的光吸收Angstrom指数（AAE）的方法统计外推黑碳AAE值，估算这2个典型地区PM_2.5中棕色碳的吸光贡献.结果表明：经统计外推获得的金华和望都的黑碳AAE在405nm下的基准值分别是1.12和0.77，532nm下的基准值分别是0.87和0.63；进而估算金华和望都PM_2.5中的棕色碳在405nm下的吸光贡献分别为9.8%和22.3%；532nm下的吸光贡献分别为5.9%和15.2%，表明我国大气中气溶胶棕色碳在短波段下的吸光贡献和辐射强迫影响不可忽视.

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	崔杰
	黄晓锋
	袁金凤
	曹礼明
	王川
	兰紫娟
	何凌燕

关键词 ：棕色碳(BrC), 黑碳(BC), 光吸收系数, 光吸收Angstorm指数(AAE)

Abstract：Two field campaigns were conducted using a three-wavelength photo-acoustic soot spectrometer (PASS-3) and aerosol mass spectrometers (AMS), including urban site Jinhua during autumn 2011 and rural site Wangdu during summer 2014 in this study. Light absorption of brown carbon with improved Absorption Angstrom Exponent (AAE) method was evaluated by extrapolating the more realistic AAE by "pure" BC (AAE__BC). The AAE__BC were found to be 1.12, 0.77 between 405nm and 781nm, and 0.87, 0.63 between 532nm and 781nm in the campaign of Jinhua and Wangdu, respectively. The contributions of BrC aerosol light absorption of PM_2.5 at 405nm were 9.8% and 22.3%, and 5.9% and 15.2% at 532nm in Jinhua and Wangdu, respectively. The results indicate that the contribution of brown carbon to the aerosol light absorption at shorter wavelength is not negligible in China.

Key words： brown carbon (BrC) black carbon (BC) light absorption absorption angstrom exponent (AAE)

收稿日期: 2016-03-28

PACS:

X513

基金资助:国家“973”项目（2013CB228503）；国家自然科学基金项目（21277003）

通讯作者: 黄晓锋,教授,huangxf@pku.edu.cn E-mail: huangxf@pku.edu.cn

作者简介: 崔杰(1990-),男,山东东营人,北京大学深圳研究生院硕士研究生,主要从事碳质气溶胶吸光性研究.

引用本文:

崔杰, 黄晓锋, 袁金凤, 曹礼明, 王川, 兰紫娟, 何凌燕. 基于在线观测的大气PM_2.5中棕色碳吸光贡献估算[J]. 中国环境科学, 2017, 37(2): 401-406. CUI Jie, HUANG Xiao-feng, YUAN Jin-feng, CAO Li-ming, WANG Chuan, LAN Zi-juan, HE Ling-yan. Estimation of light absorption by brown carbon in PM_2.5 based on on-line measurement. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 401-406.

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http://manu36.magtech.com.cn/Jweb_zghjkx/CN/ 或 http://manu36.magtech.com.cn/Jweb_zghjkx/CN/Y2017/V37/I2/401

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