新疆2018年冬季雨雪风沙强降尘事件

doi:10.13866/j.azr.2023.05.01

Abstract

Abstract:

An unusual winter synoptic process of mixed rain and snow with strong airborne dustfall occurred in Xinjiang, northwestern China from November 30 to December 3, 2018. Based on the meteorological records, environmental monitoring data, and continuous atmospheric dustfall observations, we analyzed the characteristics of the air pollutants during the synoptic process and studied their impact on the environment. The results showed that, during this anomalous synoptic process, >90% of the oasis cities in Xinjiang Province, China were affected by the atmospheric particulate pollution. The inhalable particulate matter comprised mostly coarse particles. This abnormal synoptic process caused the concentration of particulate matter to rapidly rise with PM₁₀(particulate matter with aerodynamic diameter ≤10 μm) concentration in Xinjiang reaching a maximum of 4745 μg·m^-3. The occurrence of strong winds in the Xinjiang cities was highly positively correlated with the elevated PM₁₀concentration and air quality index. This synoptic process resulted in a total atmospheric dust deposition of approximately 0.9-1.52 million tons in the provincial capital city of Urumqi. The average airborne dustfall intensity in Urumqi was 85 g·m^-2, exceeding the city’s annual average by 60%. This anomalous winter rain and snow mixed with eolian dust caused severe pollution of the atmosphere as well as intense atmospheric dustfall. Under the action of atmospheric circulation with jet streams, enormous amounts of particulates were transported to the oasis areas, seriously deteriorating the quality of the atmosphere in the urban environment. The Taklamakan Desert is the main pollution source for these strong winter dustfall events in Xinjiang, northwestern China.

Key words: atmospheric environment, anomalous synoptic process, strong winter dustfall, atmospheric particulates, Xinjiang

XUE Yibo, HUANG Shuangyan, ZHANG Xiaoxiao, LEI Jiaqiang, LI Shengyu. Study on the strong winter airborne dustfall mixed rain and snow events in Xinjiang, China in 2018[J].Arid Zone Research, 2023, 40(5): 681-690.

Figures/Tables 8

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References 30

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时间	最大PM₁₀浓度/（μg·m^-3）	最大AQI值^*	最低能见度/m	最大风速/（m·s^-1）^**
2018-11-30	690（吐鲁番）	466（吐鲁番）	70（石河子）	14（乌鲁木齐）
2018-12-01	4745（阿克苏）	435（吐鲁番）	10（乌鲁木齐）	23（阿克苏）
2018-12-02	1865（五家渠）	475（石河子）	80（石河子）	14（吐鲁番）
2018-12-03	1035（阿克苏）	467（喀什）	330（阿图什）	10（和田）

Study on the strong winter airborne dustfall mixed rain and snow events in Xinjiang, China in 2018

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