The autumn haze-fog episode enhanced by the transport of dust aerosols in the Tianjin area
The autumn haze-fog episode enhanced by the transport of dust aerosols in the Tianjin area
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天津地区秋季灰霾天气受沙尘气溶胶输送作用增强
DOI：
10.1016/j.atmosenv.2020.117669
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发表时间：
2020-09
影响因子：
5
通讯作者：
Yang Zhou
中科院分区：
文献类型：
--
作者：
Liying Zhao;Wencai Wang;Tianyi Hao;Wenjun Qu;Lifang Sheng;Chenghan Luo;Xiadong An;Yang Zhou
中国沙漠地区的沙尘气溶胶可被提升到对流层高层，经西风向东输送，影响区域和局地空气污染过程。本文分析了2018年11月23日至12月5日天津市沙尘的远程输送及其对灰霾过程的影响。卫星和ERA5再分析资料显示，来自中国西北部的沙尘被槽后的西风气流输送到中国东部，从而加剧了天津地区的空气污染。11月26日和12月2日，能见度小于2公里，相对湿度(RH)在90%以上，表明天津有雾天气。来自西北方向的沙尘与地面污染物混合，使PM2.5和PM105质量浓度增加，加剧了空气污染，PM2.5质量浓度的累积峰值在11月26日达到300nμg/m3以上。11月27日和12月3日，风速增大，大量沙尘粒子输送到天津，PM10质量浓度超过550g/m~3，PM2.5质量浓度降至最低值，表明天津市沙尘天气进入了典型的霾-雾污染时期。地面激光雷达观测表明，大量非球形沙尘气溶胶在1.5~2.5 km高度输送到天津，并在近地面沉降，这对该地区的气溶胶光学特性和空气质量有很大影响。雾霾天气后接踵而至的沙尘天气，加剧了天津地区的空气污染过程，使其持续时间长达153小时。
Dust aerosols from the desert areas of China can be lifted to the upper troposphere and transported eastward by the westerly, affecting regional and local air pollution process. In this paper, we analyzed the long-range transport of dust and its impact on the haze-fog process that occurred in Tianjin from 23 November to 5 December 2018. Satellite and ERA5 reanalysis data revealed that dust from northwestern China was transported to eastern China by the westerly flow behind the troughs, which subsequently enhanced the air pollution in Tianjin area. On 26 November and 2 December, the visibility was less than 2 km with a relative humidity (RH) over 90%, indicating there was fog weather in Tianjin. The dust influx from the northwest direction mixed with ground pollutants, increased the PM2.5and PM10mass concentrations and enhanced the air pollution with the cumulative peak value of the PM2.5mass concentration reaching over 300 μg/m3on 26 November. On 27 November and 3 December, the wind speed increased and large dust particles were transported to Tianjin, the PM10mass concentration exceeded a much higher value of 550 μg/m3whereas the PM2.5mass concentration decreased to its lowest value, indicating dust weather followed the typical haze-fog pollution period in Tianjin. The ground lidar observations indicated that a large amount of non-spherical dust aerosols transmitted to Tianjin at 1.5~2.5 km height and settled down near the ground, which substantially affected the aerosol optical characteristics and air quality over the area. The influx of dust successive after the haze-fog weather, aggravated the air pollution process in Tianjin area, make it lasting for 153 h.
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