首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Long‐Term Investigation of Aerosol Optical and Radiative Characteristics in a Typical Megacity of Central China During Winter Haze Periods
【24h】

Long‐Term Investigation of Aerosol Optical and Radiative Characteristics in a Typical Megacity of Central China During Winter Haze Periods

机译:冬季雾霾期华中典型特大城市气溶胶光学与辐射特性的长期研究

获取原文
获取原文并翻译 | 示例
获取外文期刊封面目录资料

摘要

Decadal aerosol characteristics and related radiative effects (ARE) and efficiencies (AREE) at ultraviolet (UV), visible (VIS), near‐infrared (NIR), and shortwave wavelengths were investigated in Wuhan during winter haze periods based on observations from 2007 to 2016. Aerosols changed significantly under haze conditions; the average aerosol optical depth increased from 0.46 to 0.93, and the ?ngstr?m exponent increased from 1.12 to 1.23. Fine‐mode particles became dominant, and their peak radius also increased due to hygroscopic growth. The mean value of the UV single‐scattering albedo increased from 0.846 to 0.873, revealing the emergence of numerous fine‐mode, nonabsorbing aerosols. Backward trajectories suggested that local aerosols were partially affected by transported dust from Northwest China, especially in 2015. The interannual variation of the mean AREE at the top of atmosphere showed a gradually increasing tendency, revealing the enhanced potential cooling capacity of aerosols to the Earth‐atmosphere system over Wuhan. The increase in the AREE fraction at UV and VIS wavelengths, and its decrease at NIR wavelengths, indicated that this phenomenon was due to the increased proportion of fine‐mode scattering components in aerosols. The variation in AREE at top of atmosphere depended mainly on the single‐scattering albedo, while the same variation at the surface depended more on particle sizes. A detailed investigation of aerosols during haze periods can help us to further understand localized climate variations and haze‐inducing mechanisms.
机译:以2007—2016年冬季雾霾期武汉市为研究对象,研究了武汉市冬季雾霾期间在紫外(UV)、可见光(VIS)、近红外(NIR)和短波波长下的年代际气溶胶特征及其相关辐射效应(ARE)和效率(AREE)。雾霾条件下气溶胶变化显著;平均气溶胶光学深度从0.46增加到0.93,?ngstr?m指数从1.12增加到1.23。细模颗粒占主导地位,其峰半径也因吸湿性增长而增加。紫外单散射反照率的平均值从0.846增加到0.873,揭示了大量精细模式、非吸收性气溶胶的出现。向后的轨迹表明,本地气溶胶部分受到来自中国西北的尘埃的影响,特别是在2015年。大气顶部平均AREE的年际变化呈逐渐增加的趋势,表明武汉上空气溶胶对地大气系统的潜在冷却能力增强。紫外和可见光波长下AREE分数的增加,以及近红外波长下AREE分数的降低,表明这种现象是由于气溶胶中细模散射成分比例的增加所致。大气顶部AREE的变化主要取决于单散射反照率,而表面的相同变化更多地取决于粒径。对雾霾期间气溶胶的详细研究可以帮助我们进一步了解局部气候变化和雾霾诱发机制。

著录项

获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号