| 东亚区域对流层臭氧及其前体物的季节性关联 |
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| 引用本文： | 刘宁微,马建中.东亚区域对流层臭氧及其前体物的季节性关联[J].应用气象学报,2017,28(4):427-435. |
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| 作者姓名： | 刘宁微 马建中 |
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| 作者单位： | 1.中国气象科学研究院, 北京 100081 |
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| 基金项目： | 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） |
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| 摘 要： | 利用2010—2012年对流层臭氧（O3）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O3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NO2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。O3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O3与NO2均在夏秋季呈正相关，冬春季呈负相关。夏季大部分地区NOx的光化学循环反应对O3生成有积极的促进作用，冬季大部分地区O3的光化学循环生成受到抑制。O3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，O3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O3的光化学生成。O3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O3分布的影响。
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| 关 键 词： | 臭氧 前体物 区域污染 卫星遥感 |
| 收稿时间： | 2017/2/20 0:00:00 |
| 修稿时间： | 2017/6/1 0:00:00 |
Seasonal Relationships Between Tropospheric Ozone and Its Precursors over East Asia |
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| Liu Ningwei and Ma Jianzhong.Seasonal Relationships Between Tropospheric Ozone and Its Precursors over East Asia[J].Quarterly Journal of Applied Meteorology,2017,28(4):427-435. |
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| Authors: | Liu Ningwei and Ma Jianzhong |
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| Institution: | 1.Chinese Academy of Meteorological Sciences, Beijing 1000812.Nanjing University of Information Science & Technology, Nanjing 2100443.Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166 |
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| Abstract: | 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 precursors 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 regions. 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 significantly positive correlations between ozone and NO2 over both northern and southern regions during summer, 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 densities 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, positive correlations between ozone and CO reach the maximum in summer and autumn over the northern region 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, stratospheric intrusion might also cause inverse correlations between ozone and CO. In most time over northern and southern regions, correlations between ozone and vapor appear highly positive, while they appear highly negative in summer over the southern region and in winter over the northern region. Although southwesterly vapor is usually companioned by pollutant transport and photochemical reaction increasing, air masses from the sea bring sufficient vapor and little ozone in summer over the southern region, and vapor in clean marine air masses may deplete ozone as well. The inverse tracing relationships between ozone and vapor possibly result from stable weather condition variations. In both regions, correlations become more significant under slightly pollution conditions, however, they are insignificant in the severely polluted and background regions, indicating that due to enhanced NO, ozone is depleted through titration effects over severely polluted regions, whereas ozone elevates with the weaker NO titration over the downwind slightly polluted regions. |
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| Keywords: | ozone precursors regional pollution satellite remote sensing |
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