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Title of Journal: Adv Atmos Sci

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Abbravation: Advances in Atmospheric Sciences

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Science Press

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DOI

10.1002/asna.18310092408

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1861-9533

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The impacts of two types of El Niño on global ozon

Authors: Fei Xie Jianping Li Wenshou Tian Jiankai Zhang Jianchuan Shu
Publish Date: 2014/07/16
Volume: 31, Issue: 5, Pages: 1113-1126
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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 BrewerDobson BD circulation which can transports more ozonepoor air from the troposphere to stratosphere leading to a decrease of ozone in the lowermiddle 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 ozonepoor air from middlehigh 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

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