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| The Impacts of Two Types of El Ni（n）o on Global Ozone Variations in the Last Three Decades | |
| 作者姓名： | XIE Fei ;LI Jianping ;TIAN Wenshou ;ZHANG Jiankai ;SHU Jianchuan |
| 作者单位： | [1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029; [2]Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000; [3]Institute of Plateau Meteorology, China Meteorological Administration, Chengdu 610072 |
| 基金项目： | supported by the 973 Program (Grant No.2010CB950400);the National Natural Science Foundation of China (Grant Nos.41225018 and 41305036) |
| 摘 要： | The effects of E1Nifio Modoki events on global ozone concentrations are investigated from 1980 to 2010 E1 Nifio Modoki events cause a stronger Brewer-Dobson （BD） circulation which can transports more ozone-poor air from the troposphere to stratosphere, leading to a decrease of ozone inthe lower-middle stratosphere from 90~S to 90~N. These changes in ozone concentrations reduce stratospheric column ozone. The reduction in stratospheric column ozone during E1 Nifio Modoki events is more pronounced over the tropical eastern Pacific than over other tropical areas because transport of ozone-poor air from middle-high latitudes in both hemispheres to low latitudes is the strongest between 60°W and 120°W. Because of the decrease in stratospheric column ozone during E1 Nifio Modoki events more UV radiation reaches the tropical troposphere leading to significant increases in tropospheric column ozone An empirical orthogonal function （EOF） analysis of the time series from 1980 to 2010 of stratospheric and tropospheric ozone monthly anomalies reveals that： E1 Nifio Modoki events are associated with the primary EOF modes of both time series. We also found that E1 Nifio Modoki events can affect global ozone more significantly than canonical E1 Nifio events. These results imply that E1 Nifio Modoki is a key contributor to variations in global ozone from 1980 to 2010. |
| 关 键 词： | 臭氧变化 厄尔尼诺 热带东太平洋 下平流层 经验正交函数 臭氧浓度 时间序列 低纬度地区 |
The impacts of two types of El Niño on global ozone variations in the last three decades |
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| XIE Fei,;LI Jianping,;TIAN Wenshou,;ZHANG Jiankai,;SHU Jianchuan.The impacts of two types of El Ni?o on global ozone variations in the last three decades[J].Advances in Atmospheric Sciences,2014,31(5):1113-1126. | |
| Authors: | Fei Xie Jianping Li Wenshou Tian Jiankai Zhang Jianchuan Shu |
| Institution: | 1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China 2. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000, China 3. Institute of Plateau Meteorology, China Meteorological Administration, Chengdu, 610072, China |
| Abstract: | The effects of El Niño Modoki events on global ozone concentrations are investigated from 1980 to 2010 El Niño Modoki events cause a stronger Brewer-Dobson (BD) circulation which can transports more ozone-poor air from the troposphere to stratosphere, leading to a decrease of ozone in the lower-middle stratosphere from 90°S to 90°N. These changes in ozone concentrations reduce stratospheric column ozone. The reduction in stratospheric column ozone during El Niño Modoki events is more pronounced over the tropical eastern Pacific than over other tropical areas because transport of ozone-poor air from middle-high latitudes in both hemispheres to low latitudes is the strongest between 60°W and 120°W. Because of the decrease in stratospheric column ozone during El Niño Modoki events more UV radiation reaches the tropical troposphere leading to significant increases in tropospheric column ozone An empirical orthogonal function (EOF) analysis of the time series from 1980 to 2010 of stratospheric and tropospheric ozone monthly anomalies reveals that: El Niño Modoki events are associated with the primary EOF modes of both time series. We also found that El Niño Modoki events can affect global ozone more significantly than canonical El Niño events. These results imply that El Niño Modoki is a key contributor to variations in global ozone from 1980 to 2010. |
| Keywords: | stratospheric ozone tropospheric ozone canonical E1 Nifio E1 Nifio Modoki |
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