东亚区域对流层臭氧及其前体物的季节性关联  

Seasonal Relationships Between Tropospheric Ozone and Its Precursors over East Asia

作　　者：刘宁微[1,2,3] 马建中[1] 

机构地区：[1]中国气象科学研究院,北京100081 [2]南京信息工程大学,南京210044 [3]中国气象局沈阳大气环境研究所,沈阳110166

出　　处：《应用气象学报》2017年第4期427-435,共9页Journal of Applied Meteorological Science

基　　金：国家自然科学基金项目(91537107);中国气象局沈阳大气环境研究所基本科研业务经费项目(2015IAE-CMA06)

摘　　要：利用2010—2012年对流层臭氧(O_3)及其多种前体物的卫星遥感资料和全球水汽再分析资料,研究东亚区域O_3及其前体物的时空分布,以及在中国东部(分为南、北两部分)相关性的季节变化。结果表明:东亚区域NO_2与CO的对流层柱含量均表现为冬季高、夏季低的时空变化形式。O_3对流层柱含量夏季达到峰值,冬季为谷值。中国东部的北部与南部地区O_3与NO_2均在夏秋季呈正相关,冬春季呈负相关。夏季大部分地区NO_x的光化学循环反应对O_3生成有积极的促进作用,冬季大部分地区O_3的光化学循环生成受到抑制。O_3与CO在北部地区夏秋季和南部地区夏季正相关性最大,无论是在北部还是南部地区,O_3与CO的相关性在轻污染情况下最大,而在重污染和背景情况下较小,表明重污染气团向下风方的输送更有利于O_3的光化学生成。O_3与水汽在北部和南部地区的多数时间均呈较显著的正相关性,而在南部地区夏季和北部地区冬季具有较大的负相关性,反映出不同的环流形式、气团来源及伴随的天气条件变化对O_3分布的影响。Satellite data of ozone with its various precursors and global reanalysis products of vapor throughout 2010 and 2012 are used to evaluate spatial-temporal variations of tropospheric ozone and its various precur- sors over East Asia with their correlations over East China. Northern and southern regions of East China are treated separately in order to address Asian Summer Monsoon＇s different influences on these two re- gions. It shows that the tropospheric column densities of NO2 and CO are high in winter, while low in summer. The tropospheric column density of ozone reaches its maximum and minimum in summer and winter, respectively. Correlations between ozone and NO2 varies similarly with seasons change, appearing positive in summer and autumn, while negative in winter and spring over both regions. There are signifi- cantly positive correlations between ozone and NO2 over both northern and southern regions during sum- mer, which demonstrates due to the strong sunlight, NO2 appears short life-time and declined densities, thus the NOx-involved photochemical cycles produce ozone actively in summer. The negative correlations during winter result from the depression of ozone photochemical cycles due to long life-time and high densi- ties of NO2 over most regions, especially in the northern region with much more heating emissions, leading to ozone depletion by NO. Owing to the transport of polluted air masses to the downwind directions, posi- tive correlations between ozone and CO reach the maximum in summer and autumn over the northern re- gion and summer over the southern region. There are slightly negative correlations between ozone and CO over the northern region in winter and over the southern region in summer, because CO reaches maximum companioned with the enhancement of NO that has the titration effect to deplete ozone. In addition, strato- spheric intrusion might also cause inverse correlations between ozone and CO. In most time over northern and southern regions, correlations between ozone and vapor appear h

关 键 词：臭氧 前体物 区域污染 卫星遥感 

分 类 号：X51[环境科学与工程—环境工程] X87