余珂, 朱珠, 柴文咪, 王卫国, 王颢樾. 南亚季风环流与臭氧时空分布变化关系的特征分析[J]. 云南大学学报(自然科学版), 2023, 45(1): 111-123. doi: 10.7540/j.ynu.20210518
引用本文: 余珂, 朱珠, 柴文咪, 王卫国, 王颢樾. 南亚季风环流与臭氧时空分布变化关系的特征分析[J]. 云南大学学报(自然科学版), 2023, 45(1): 111-123. doi: 10.7540/j.ynu.20210518
YU Ke, ZHU Zhu, CHAI Wen-mi, WANG Wei-guo, WANG Hao-yue. Analysis of relationship between time-space distribution characteristics of ozone and South Asian monsoon circulation[J]. Journal of Yunnan University: Natural Sciences Edition, 2023, 45(1): 111-123. DOI: 10.7540/j.ynu.20210518
Citation: YU Ke, ZHU Zhu, CHAI Wen-mi, WANG Wei-guo, WANG Hao-yue. Analysis of relationship between time-space distribution characteristics of ozone and South Asian monsoon circulation[J]. Journal of Yunnan University: Natural Sciences Edition, 2023, 45(1): 111-123. DOI: 10.7540/j.ynu.20210518

南亚季风环流与臭氧时空分布变化关系的特征分析

Analysis of relationship between time-space distribution characteristics of ozone and South Asian monsoon circulation

  • 摘要: 利用2005年1月至2017年12月搭载在美国环境监测Aura卫星上的臭氧监测仪(Ozone Monitoring Instrument, OMI)数据和NCEP气象资料,在夏季风环流指数定义方法的基础上,重新定义了南亚区域冬季风环流指数,并分别计算了南亚夏季风和冬季风环流指数. 结合冬夏两季环流的强弱变化采用相关分析、合成分析和奇异值分解(Singular Value Decomposition, SVD)等方法,探讨了环流异常形势下臭氧的时空变化特征. 结果表明:①南亚夏季纬向环流与经向环流的强度变化存在一致性,冬季经向环流与纬向环流的强度变化差异较大. ②南亚臭氧柱总量的季节变化明显,且近13年来臭氧柱总量整体呈上升趋势. ③夏季(冬季)风环流指数与对流层中低(中高)层和平流层中低层臭氧的相关性显著,但夏季平流层和对流层的相关趋势相反. ④夏季风环流增强对应青藏高原−伊朗高原上空及南侧区域的上升运动增强,对臭氧的输送作用是造成对流层臭氧分布呈现差异的原因. ⑤冬季风环流强弱期的垂直上升和下沉运动中心的移动,以及南北向、东西向气流交汇区的差异是造成臭氧分布不同的原因.

     

    Abstract: Using Ozone Monitoring Instrument (OMI) data and NCEP meteorological data aboard the US Environmental Monitoring Aura satellite from January 2005 to December 2017, the winter circulation index in South Asia is redefined based on the definition of the summer monsoon index, and the South Asian summer monsoon and winter wind circulation index are calculated respectively. The temporal and spatial variation characteristics of ozone under abnormal circulation in winter and summer are discussed by using correlation analysis, composite analysis and Singular Value Decomposition (SVD). The results show that: ① In South Asia, the intensity of zonal circulation is consistent with that of meridional circulation in summer, but the intensities of the two types of circulations are very different in winter. ② In the past 13 years, the distribution of total ozone in South Asia has undergone obvious seasonal changes, and the total amount of ozone has shown an upward trend. ③ Circulation index in summer monsoon (winter monsoon) has a significant correlation with ozone in the middle and lower (the middle and high) troposphere and also with ozone in the middle and lower (the middle and high) stratosphere, but in winter the correlation in the stratosphere and the troposphere demonstrates an opposite trend. ④ The enhancement of summer monsoon circulation corresponds to the enhancement of upward airflow movement over the Qinghai-Tibet Plateau and the southern part of the Iranian Plateau, and the transport of ozone leads to the difference of tropospheric ozone distributions. ⑤ During the strong and weak winter circulation periods, the vertical movement of updraft center and downdraft center, and the difference between the north-south airflow and the east-west airflow are the causes of the different distributions of ozone. This further proves that the definition of the winter circulation index is reliable.

     

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