Dynamical study of a tropical cut-off low over South Africa, and its impact on tropospheric ozone

被引:31
作者
Baray, JL [1 ]
Baldy, S
Diab, RD
Cammas, JP
机构
[1] Univ Reunion, Lab Phys Atmosphere, CNRS, UMR 8105, 15 Av Rene Cassin,BP 7151, St Denis 97715 9, Reunion, France
[2] Univ KwaZulu Natal, Sch Life & Environm Sci, ZA-4041 Dalbridge, South Africa
[3] Observ Midi Pyrenees, Lab Aerol, CNRS, UMR 5560, F-31400 Toulouse, France
关键词
tropical tropospheric dynamics; southern hemisphere; stratosphere-troposphere exchange; tropospheric ozone; airborne measurements; radiosounding;
D O I
10.1016/S1352-2310(02)00999-8
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The structure and evolution of an intense tropical cut-off low (COL) occurring over South Africa is documented, by combining meteorological and ozone data from a number of different sources, such as in situ radiosoundings, Measurement of ozone and water vapor by airbus in-service aircraft data, satellite (Meteosat) and modelled European Center for Medium-Range Weather Forecast data. The COL extends to latitude 10degreesS, with a lifetime of approximately 2 weeks, and a horizontal size of about 10degrees. A distinguishing feature of this case study is that it becomes detached from the stratospheric reservoir in both the vertical and horizontal planes, in an irreversible way and as such is different in structure to a mid-latitude or a polar COL. Consequently, even though tropical COLs may occur infrequently, it is likely that the tropospheric ozone enhancement induced by this irreversible intrusion could be significant. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1475 / 1488
页数:14
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