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Black carbon and wavelength-dependent aerosol absorption in the North China Plain based on two-year aethalometer measurements

机译：基于两年测速计测量的华北平原黑碳和与波长相关的气溶胶吸收

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摘要

Light-absorbing components of atmospheric aerosols have gained particular attention in recent years due to their climatic and environmental effects. Based on two-year measurements of aerosol absorption at seven wavelengths, aerosol absorption properties and black carbon (BC) were investigated in the North China Plain (NCP), one of the most densely populated and polluted regions in the world. Aerosol absorption was stronger in fall and the heating season (from November to March) than in spring and summer at all seven wavelengths. Similar spectral dependence of aerosol absorption was observed in non-heating seasons despite substantially strong absorption in fall. With an average absorption Angstrom exponent (alpha) of 1.36 in non-heating seasons, freshly emitted BC from local fossil fuel burning was thought to be the major component of light-absorbing aerosols. In the heating season, strong ultraviolet absorption led to an average alpha of 1.81, clearly indicating the importance of non-BC light-absorbing components, which were possibly from coal burning for domestic heating and aging processes on a regional scale. Diurnally, the variation of BC mass concentrations experienced a double-peak pattern with a higher level at night throughout the year. However, the diurnal cycle of alpha in the heating season was distinctly different from that in non-heating seasons. a peaked in the late afternoon in non-heating seasons with concomitantly observed low valley in BC mass concentrations. In contrast, alpha peaked around the midnight in the heating season and lowered down during the daytime. The relationship of aerosol absorption and winds in non-heating seasons also differed from that in the heating season. BC mass concentrations declined while alpha increased with increasing wind speed in non-heating seasons, which suggested elevated non-BC light absorbers in transported aged aerosols. No apparent dependence of alpha on wind speed was found in the heating season, probably due to well mixed regional pollution. Pollution episodes were mostly encountered under low winds and had a low level of alpha, implying aerosol absorption should be largely attributed to freshly emitted BC from local sources under such conditions. Extensive field campaigns and long-term chemical and optical measurements of light-absorbing aerosols are needed in the future to further advance our understanding on optical properties of light-absorbing aerosols and their radiative forcing in this region. (C) 2016 The Authors. Published by Elsevier Ltd.
机译：近年来，大气气溶胶的吸光成分由于其气候和环境影响而受到特别关注。根据对七种波长的气溶胶吸收的两年测量结果，对华北平原（NCP）进行了气溶胶吸收特性和黑碳（BC）的研究，这是世界上人口最稠密和污染最严重的地区之一。在所有七个波长下，秋季和加热季节（11月至3月）的气溶胶吸收均强于春季和夏季。尽管在秋季非吸收性强，但在非供暖季节仍观察到相似的气溶胶吸收光谱依赖性。在非供暖季节，平均吸收埃指数（alpha）为1.36，被认为是当地化石燃料燃烧产生的新鲜散发的BC是吸光气溶胶的主要成分。在采暖季节，强烈的紫外线吸收导致平均α为1.81，这清楚地表明了非BC光吸收成分的重要性，这些成分可能来自燃煤以用于区域规模的家庭取暖和老化过程。昼夜，BC浓度的变化经历了一个双峰模式，并且在全年的晚上处于较高水平。但是，在供暖季节，α的昼夜周期与非供暖季节明显不同。在非供暖季节的下午晚些时候达到峰值，同时观察到卑诗省质量浓度低谷。相反，在供暖季节的午夜左右，α峰达到顶峰，而白天则下降。在非供暖季节，气溶胶吸收与风的关系也与供暖季节不同。在非供暖季节，随着风速的增加，BC的质量浓度下降而α值增加，这表明运输的老化气溶胶中非BC的光吸收剂含量增加。在供暖季节，没有发现α对风速的明显依赖，这可能是由于区域污染的混合程度很高。污染事件通常是在低风下遇到的，且α含量很低，这意味着在这种情况下，气溶胶吸收应主要归因于当地来源的新鲜散发的BC。将来需要进行广泛的野外活动，并对吸光气溶胶进行长期的化学和光学测量，以进一步增进我们对吸光气溶胶的光学特性及其在该地区的辐射强迫的理解。 （C）2016作者。由Elsevier Ltd.发布

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  • 来源
    《Atmospheric environment》 |2016年第10期|132-144|共13页
  • 作者

    Ran L.; Deng Z. Z.; Wang P. C.; Xia X. A.;

  • 作者单位

    Chinese Acad Sci, Inst Atmospher Phys, Key Lab Middle Atmosphere & Global Environm Obser, Beijing 700089, Peoples R China;

    Chinese Acad Sci, Inst Atmospher Phys, Key Lab Middle Atmosphere & Global Environm Obser, Beijing 700089, Peoples R China;

    Chinese Acad Sci, Inst Atmospher Phys, Key Lab Middle Atmosphere & Global Environm Obser, Beijing 700089, Peoples R China;

    Chinese Acad Sci, Inst Atmospher Phys, Key Lab Middle Atmosphere & Global Environm Obser, Beijing 700089, Peoples R China|Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing 270044, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Light-absorbing aerosols; Black carbon; Absorption Angstrom exponent; Aethalometer; North China Plain;

    机译：吸光气溶胶炭黑吸收埃指数高度计华北平原;

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