首页 | 本学科首页   官方微博 | 高级检索  
     


Intraseasonal Oscillation of Tropospheric Ozone over the Indian Summer Monsoon Region
Authors:Yuli ZHANG  Chuanxi LIU  Yi LIU  Rui YANG
Abstract:Boreal summer intraseasonal oscillation (BSISO) of lower tropospheric ozone is observed in the Indian summer monsoon (ISM) region on the basis of ERA-Interim reanalysis data and ozonesonde data from the World Ozone and Ultraviolet Radiation Data Centre. The 30-60-day intraseasonal variation of lower-tropospheric ozone shows a northwest-southeast pattern with northeastward propagation in the ISM region. The most significant ozone variations are observed in the Maritime Continent and western North Pacific. In the tropics, ozone anomalies extend from the surface to 300 hPa; however, in extratropical areas, it is mainly observed under 500 hPa. Precipitation caused by BSISO plays a dominant role in modulating the BSISO of lower-tropospheric ozone in the tropics, causing negative/positive ozone anomalies in phases 1-3/5-6. As the BSISO propagates northeastward to the western North Pacific, horizontal transport becomes relatively more important, increasing/reducing tropospheric ozone via anticyclonic/cyclonic anomalies over the western North Pacific in phases 3-4/7-8. As two extreme conditions of the ISM, most of its active/break events occur in BSISO phases 4-7/1-8 when suppressed/enhanced convection appears over the equatorial eastern Indian Ocean and enhanced/suppressed convection appears over India, the Bay of Bengal, and the South China Sea. As a result, the BSISO of tropospheric ozone shows significant positive/negative anomalies over the Maritime Continent, as well as negative/positive anomalies over India, the Bay of Bengal, and the South China Sea in active/break spells of the ISM. This BSISO of tropospheric ozone is more remarkable in break spells than in active spells of the ISM, due to the stronger amplitude of BSISO in the former.
Keywords:boreal summer intraseasonal oscillation   tropospheric ozone   Indian summer monsoon   active/break spell
本文献已被 CNKI 维普 等数据库收录!
点击此处可从《大气科学进展》浏览原始摘要信息
点击此处可从《大气科学进展》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号