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Effect of aerosol-radiation feedback on regional air quality - A case study with WRF/Chem

机译：气溶胶辐射反馈对区域空气质量的影响-以WRF / Chem为例

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摘要

Numerical simulations were performed in order to investigate the impact of the direct effect of aerosol particles on radiation and the indirect aerosol effect on meteorological variables and subsequent distributions of near surface ozone and PM10 over Europe. The fully coupled meteorology-chemistry community model WRF/Chem has been applied for June and July 2006 for a baseline case without any aerosol feedback on meteorology, a simulation with the direct effect included, and a simulation including the direct as well as the indirect aerosol effect. The impact of the subsequent changes in temperature, boundary layer height, and clouds that were triggered by the direct effect of aerosol on radiation ("semi-direct effect") was found to dominate the direct effect of aerosol particles on solar radiation. Over Central Europe the mean reduction of global radiation alone was mostly 3-7 W m~(-2),but changes in cloud cover due to semi-direct effects resulted in monthly mean changes between ±50 Wm~(-2). The inclusion of the indirect aerosol effect resulted in a pronounced decrease of cloud water content by up to 70% and a significantly higher mean rain water content over the North Atlantic. Although generally plausible, the effect appears to be too strong due to too low simulated aerosol particle numbers in this area. Regional changes in precipitation between -100% and 100% were simulated over the European continent. For the simulation including only the direct aerosol effect these changes are almost entirely due to semi-direct effects. Mean ozone mixing ratios over Europe in July were modified by up to 4 ppb or 10% over continental Europe, mostly related to changes in cloud cover. For PM10 the inclusion of the direct effect resulted for the considered episode in a mean decrease by 20-50% due to an increased atmospheric boundary layer height except for the regions with high PM10 concentrations. When the indirect aerosol effect was additionally taken into account an increase of the monthly PM10 concentration by 1-3 μg m~(-3) was found for July 2006 over large parts of continental Europe.
机译：为了研究气溶胶颗粒对辐射的直接影响以及间接气溶胶对气象变量以及随后欧洲近地表臭氧和PM10分布的影响，进行了数值模拟。完全耦合的气象-化学界模型WRF / Chem已于2006年6月和7月用于基准案例，没有任何气象学气溶胶反馈，包括直接效应的模拟以及包括直接和间接气溶胶的模拟影响。发现随后的温度变化，边界层高度变化和由气溶胶对辐射的直接影响（“半直接效应”）触发的云的影响主导了气溶胶颗粒对太阳辐射的直接影响。在中欧地区，仅全球辐射的平均减少量大多为3-7 W m〜（-2），但由于半直接效应而引起的云量变化导致每月平均变化在±50 Wm〜（-2）之间。包含间接气溶胶效应导致北大西洋上空的云层水含量明显降低了70％，并且平均雨水含量明显更高。尽管通常似乎是合理的，但由于该区域的模拟气溶胶颗粒数量太低，因此效果似乎太强。在欧洲大陆，模拟了-100％至100％之间的降水区域变化。对于仅包括直接气溶胶效应的模拟，这些变化几乎完全是由于半直接效应引起的。欧洲7月的平均臭氧混合比被修改为欧洲大陆最高4 ppb或10％，主要与云量的变化有关。对于PM10，除了高PM10浓度的区域外，由于大气边界层高度的增加，直接影响的考虑导致所考虑的事件平均减少20-50％。当另外考虑间接气溶胶效应时，在欧洲大陆的大部分地区，发现2006年7月PM10的月浓度增加了1-3μgm〜（-3）。

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  • 来源
    《Atmospheric environment》 |2012年第6期|p.202-211|共10页
  • 作者

    Renate Forkel; Johannes Werhahn; Ayoe Buus Hansen; Stuart McKeen; Steven Peckham; Georg Grell; Peter Suppan;

  • 作者单位

    Karlsruhe Institute of Technology (KIT) - Institute for Meteorology and Climate Research, IMK-IFU, Kreuzeckbahnstrasse 19, 82467 Carmisch-Partenkirchen, Germany;

    Karlsruhe Institute of Technology (KIT) - Institute for Meteorology and Climate Research, IMK-IFU, Kreuzeckbahnstrasse 19, 82467 Carmisch-Partenkirchen, Germany;

    National Environmental Research Institute, Department of Atmospheric Environment, Aarhus University, Denmark;

    National Oceanic and Atmospheric Administration (NOAA), Earth System Research Laboratory, Boulder, USA;

    National Oceanic and Atmospheric Administration (NOAA), Earth System Research Laboratory, Boulder, USA;

    National Oceanic and Atmospheric Administration (NOAA), Earth System Research Laboratory, Boulder, USA;

    Karlsruhe Institute of Technology (KIT) - Institute for Meteorology and Climate Research, IMK-IFU, Kreuzeckbahnstrasse 19, 82467 Carmisch-Partenkirchen, Germany;

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

    WRF/Chem; online coupled model; feedback; aerosol; semi-direct effect; indirect effect;

    机译：WRF /化学;在线耦合模型反馈;气雾剂;半直接效应间接作用;

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