Analysis of the Ozone Reduction Event Over the Southern Tip of South America in November 2009

Analysis of the Ozone Reduction Event Over the Southern Tip of South America in November 2009
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2009年11月南美洲南端臭氧减少事件分析

DOI:
10.1029/2017jd028096
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发表时间:
2018
期刊:
Journal of Geophysical Research: Atmospheres
影响因子:
--
通讯作者:
Mizuno Akira
Mizuno Akira
中科院分区:
--
文献类型:
--
作者:
Akiyoshi Hideharu;Kadowaki Masanao;Nakamura Haruna;Sugita Takafumi;Hirooka Toshihiko;Harada Yayoi;Mizuno Akira

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2009年11月,南美洲南端上空的臭氧总量减少,持续了3周。对ERA中期再分析数据和臭氧监测仪器观测到的臭氧总量的分析表明,臭氧总量减少事件是极涡分裂时极涡向南美大陆迁移造成的。涡旋的迁移与南美大陆以西120-150°W和50-60°S对流层到南美大陆南部平流层的波通量增强有关,导致平流层下部出现大的负位势高度异常。11月,从南美洲大陆西部的500 hPa位势高度诊断出一次阻塞事件。这些结果表明,南美洲南端臭氧总量的长期减少与2009年南半球对流层阻塞现象通过阻塞区的波传播之间的关系。对1979-2015年11月南美洲南端50-60°S和65-75°W臭氧总距平的分析表明,2009年11月的臭氧负距平是这37年期间最大的距平之一,与平流层下部大的负位势高度距平有关。还对其他位势高度异常较大的年份进行了动力场分析。
A reduction of the total ozone over the southern tip of South America lasting 3 weeks occurred in November 2009. Analyses of the ERA‐Interim reanalysis data and the total ozone observed by the Ozone Monitoring Instrument indicate that the total ozone reduction event was caused by a migration of the polar vortex toward the South American continent at the time of the vortex breakup. The vortex migration is associated with an enhanced wave flux from the troposphere at 120–150°W and 50–60°S to the west of the South American continent to the stratosphere over the southern part of the continent, which led to a large negative geopotential height anomaly in the lower stratosphere. In November, a blocking event was diagnosed from the 500‐hPa geopotential height over the west of the South American continent. These results suggest a relation between the long‐lasting reduction of the total ozone over the southern tip of South America and the blocking phenomenon in the troposphere of the Southern Hemisphere through wave propagation from the blocking region in 2009. Analysis of the total ozone anomaly for 50–60°S and 65–75°W over the southern tip of South America in November for 1979–2015 indicates that the negative ozone anomaly in November 2009 was one of the largest anomalies in this 37‐year period and was associated with the large negative geopotential height anomaly in the lower stratosphere. Analyses of dynamical fields were also conducted for other years with large geopotential height anomalies.
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