2013-2020 年中国西北地区省会城市地面空气质量特征

IF 3 4区 地球科学 Q2 ENVIRONMENTAL SCIENCES
Dipesh Rupakheti, Sushma Dhital, Maheswar Rupakheti, Xiufeng Yin, Ping Li, Sishir Dahal, Benzhong Zhang
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引用次数: 0

摘要

在这项研究中,我们报告了 2013-2020 年期间中国西北地区五个省会城市上空的颗粒物(PM)、二氧化硫(SO2)、二氧化氮(NO2)、一氧化碳(CO)和臭氧(O3)的时空变化。在季节变化方面,所有污染物(除臭氧外)在夏季浓度最低,在冬季浓度最高,这可能是由于人为活动(如燃煤)增加和有利的气象特征所致。月平均浓度最高的时段主要是 12 月至 2 月,而臭氧的最高浓度则出现在 4 月至 8 月,不同城市在不同季节的浓度最高。在污染物的昼夜变化方面,下午晚些时候(17:00-18:00)的污染物浓度最低(O3 除外)。在所有站点中,臭氧呈现出城市站点日变化特征(下午时段达到峰值)。乌鲁木齐的PM2.5/PM10比率在11月至3月期间最高,在4月至10月期间最低。与世界卫生组织修订的指南相比,PM2.5 的年均浓度高出约 8-12 倍,而 PM10 的年均浓度超标高达 7 倍。大多数污染物在春节期间的浓度都有所下降。使用 HYSPLIT 回溯轨迹分析表明,影响五个站点的气团主要来自中国西北地区,但也不能忽视偏远地区长程污染输送的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characteristics of surface air quality over provincial capital cities in Northwestern China during 2013–2020

In this study, we have reported spatial and temporal variation in particulate matter (PM), sulfur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO) and ozone (O3) over five provincial capital cities in northwestern China during 2013–2020. Regarding the seasonal variation, all pollutants (except ozone) exhibited the lowest concentration during summer and the highest concentration during winter, which could be attributed to increased anthropogenic activities (like coal burning) and conducive meteorological features. The highest monthly mean concentrations were primarily observed during December-February, whereas ozone exhibited the highest concentration during April-August, with different cities experiencing the highest concentration during different seasons. Regarding the diurnal variation exhibited by the pollutants, the lowest concentration of pollutants (except O3) was observed during the late afternoon (17:00–18:00) period. Ozone posed the urban site diurnal variation characteristic (peak during afternoon hour) over all sites. Urumqi had the highest PM2.5/PM10 ratio during November-March and the lowest ratio during April-October. Compared to the WHO revised guideline, the annual mean PM2.5 concentration was about 8–12 times higher, whereas the annual PM10 concentration was exceeded by a factor of up to 7. Most pollutants exhibited reduced concentration during the spring festival period. Analysis using HYSPLIT back trajectories indicated that the air masses affecting the five sites primarily originated from the northwestern area of China, although the impact of long-range pollution transport from remote regions should not be overlooked.

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来源期刊
Journal of Atmospheric Chemistry
Journal of Atmospheric Chemistry 地学-环境科学
CiteScore
4.60
自引率
5.00%
发文量
16
审稿时长
7.5 months
期刊介绍: The Journal of Atmospheric Chemistry is devoted to the study of the chemistry of the Earth''s atmosphere, the emphasis being laid on the region below about 100 km. The strongly interdisciplinary nature of atmospheric chemistry means that it embraces a great variety of sciences, but the journal concentrates on the following topics: Observational, interpretative and modelling studies of the composition of air and precipitation and the physiochemical processes in the Earth''s atmosphere, excluding air pollution problems of local importance only. The role of the atmosphere in biogeochemical cycles; the chemical interaction of the oceans, land surface and biosphere with the atmosphere. Laboratory studies of the mechanics in homogeneous and heterogeneous transformation processes in the atmosphere. Descriptions of major advances in instrumentation developed for the measurement of atmospheric composition and chemical properties.
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