影响我国夏季臭氧浓度变化的大气环流特征及大气外强迫因子  

Influences of Atmospheric Circulation and External Forcing Factors on Summer Ozone Concentration Variations in China

作　　者：张脉惠 荀尚培[2,3,4,5] 霍彦峰 戴晓慧[1] 何彬方 吴文玉 陈心桐[2,3,4,5] 张宏群 ZHANG Maihui;XUN Shangpei;HUO Yanfeng;DAI Xiaohui;HE Binfang;WU Wenyu;CHEN Xintong;ZHANG Hongqun(Anhui Public Meteorological Service Center,Hefei 230031;Anhui Institute of Meteorological Sciences,Hefei 230031;Key Laboratory for Atmospheric Sciences&Remote Sensing of Anhui Province,Hefei 230031;Shouxian National Climate Observatory,Huainan,Anhui Province 232200;Huaihe River Basin Typical Farmland Ecological Meteorological Field Science Experiment Base of China Meteorology)

机构地区：[1]安徽省公共气象服务中心,合肥230031 [2]安徽省气象科学研究所,合肥230031 [3]安徽省大气科学与卫星遥感重点实验室,合肥230031 [4]寿县国家气候观象台,安徽淮南232200 [5]中国气象局淮河流域典型农田生态气象野外科学试验基地,安徽淮南232200

出　　处：《气候与环境研究》2025年第1期67-76,共10页Climatic and Environmental Research

基　　金：风云卫星应用先行计划项目FY-APP-2022.0603;安徽省气象局创新发展专项YJG202203;国家自然科学基金区域创新发展联合基金项目U21A2028。

摘　　要：利用观测和再分析数据,探讨了2013~2020年影响我国夏季臭氧浓度变化的主要大气环流异常和大气外强迫因子,结果表明:我国夏季臭氧浓度变化的主导模态表现出明显的全区一致型特征,且以我国中东部地区变化为主。与我国夏季臭氧浓度增加相关的环流异常主要是西北太平洋地区的低层气旋性环流和低压异常,该环流能减弱气候态水汽输送,减少大气水汽比湿,并通过增强太阳辐射和抑制湿清除作用从而增加近地表臭氧浓度。通过分析大气外强迫因子我们发现,显著影响我国夏季臭氧浓度变化及相应大气环流异常的强迫因子主要是夏季海洋性大陆全区一致型的海温分布,其冷暖状态能通过调节越赤道Hadley环流异常从而改变局地环流并进一步影响我国夏季臭氧浓度变化。海洋性大陆海温具有较好的持续性且能提前2个月与随后我国夏季臭氧浓度产生显著联系,因此我们可以利用该海温因子来对我国夏季臭氧浓度变化进行一定的可预测性研究。Using observation and reanalysis data,this study explores main atmospheric circulation anomalies and external atmospheric forcing factors that affect summer ozone concentration variations in China during 2013–2020.The results show that the dominant mode of summer ozone concentration variations in China is characterized by the same anomalies over the whole region,with the most significant changes occurring in central and eastern China.Circulation anomalies related to an increased summer ozone concentration in China are mainly featured by low-level cyclonic circulation and low-pressure anomalies in the Northwest Pacific region.This circulation can weaken the transport of climatological water vapor,reduce the specific humidity of atmospheric water vapor,and thus increase the near-surface ozone concentration by enhancing solar radiation and suppressing the moisture removal effect.Further analysis indicates that the external forcing factors that significantly affect changes in the summer ozone concentration in China and the corresponding atmospheric circulation anomalies are mainly derived from the component mode of summer SST anomalies over the maritime continent.These anomalies can modulate local circulation and then affect the summer ozone concentration anomaly in China by adjusting the cross-equatorial Hadley circulation anomaly.Maritime Continent SST anomalies exhibit strong persistence and are significantly correlated with the subsequent summer ozone concentration in China two months in advance.Therefore,we can use the maritime continent SST anomalies to conduct predictability research on changes in the summer ozone concentration in China.

关 键 词：臭氧浓度 大气环流 外强迫因子 

分 类 号：P434.2[天文地球—大气科学及气象学]