兰州市大气挥发性有机物变化特征  

Distribution characteristic of VOCs in Lanzhou using the atmospheric supersite

作　　者：周惜荫 高晓清 常毅 赵素平 ZHOU Xiyin;GAO Xiaoqing;CHANG Yi;ZHAO Suping(Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000;University of Chinese Academy of Sciences,Beijing 100049;Gansu Environmental Monitoring Center Station,Lanzhou 730000)

机构地区：[1]中国科学院西北生态环境资源研究院冰冻圈科学与冻土工程重点实验室,兰州730000 [2]中国科学院大学,北京100049 [3]甘肃省环境监测中心站,兰州730000

出　　处：《环境科学学报》2024年第8期59-69,共11页Acta Scientiae Circumstantiae

基　　金：中国科学院青年创新促进会优秀会员项目(No.Y2021111);甘肃省杰青基金(No.20JR10RA037)。

摘　　要：基于甘肃省兰州市大气综合观测站(超级站)2020—2021年长时间观测结果,本文利用HYSPLIT模型及OFP方法,估算了兰州市大气挥发性有机物(VOCs)的传输特征和本地贡献.结果表明,不同VOCs种类体积浓度有明显的日变化特点,相对高值主要出现在7:00—12:00(BJT,下同),相对低值主要出现在0:00—4:00和14:00—20:00,除含氧挥发性有机物(OVOCs)和卤代烃外,其他种类VOCs体积浓度冬季高夏季低;2020—2021年兰州市VOCs种类主要以OVOCs为主,烯烃对臭氧生成贡献最大;VOCs长距离传输源分布在新疆、青海省,短距离输送源主要在甘肃省的中部和东南部地区;1000 m以上高度处,VOCs以长距离输送为主,1000 m以下以短距离输送为主.夏、秋季1000 m以上长距离传输气团携带的VOCs平均体积浓度较高;冬、春季1000 m以上高度短距离传输气团携带的VOCs平均体积浓度最高.本工作对科学制定兰州市大气污染防治对策有重要参考价值.Based on the long-term observation results from 2020 to 2021 at the Atmospheric Comprehensive Observation Station in Lanzhou,Gansu Province,the HYSPLIT model was used to analyze the variation characteristics of atmospheric volatile organic compounds(VOCs).The results showed that the volume concentrations of different VOCs species had obvious daily variation characteristics.The relatively high values appeared between 7 o’clock a.m.and 12 o’clock(BJT,the same below),and the relatively low values appeared in 0 o’clock a.m.to 4 o’clock and 2 o’clock p.m.to 8 o’clock.The volume concentration was high in winter and low in summer.The types of VOCs were OVOCs,and olefins contributed the most to the generation of ozone.The long-distance transmission sources of VOCs were in Xinjiang and Qinghai Province,and the short-distance transmission sources were in the central and southeastern regions of Gansu Province.The transmission sources of VOCs above 1000 m was mainly for long-distance,and below 1000 m was short-distance.The average volume concentration of VOCs carried by long-distance transmission air masses above 1000 meters in summer and autumn were higher;the average volume concentration of VOCs carried by short-distance transmission air masses above 1000 meters in winter and spring were the highest.This work had important reference value for scientifically formulating air pollution prevention and control countermeasures in Lanzhou.

关 键 词：大气综合观测站 大气挥发性有机物(VOCs) 季节特征 HYSPLIT 兰州市 

分 类 号：X51[环境科学与工程—环境工程] P402[天文地球—大气物理学与大气环境]