%0 Conference Proceedings
%4 cptec.inpe.br/adm_conf/2005/10.31.16.11
%2 cptec.inpe.br/adm_conf/2005/10.31.16.11.32
%T The Role of the Low-Level Jet East of the Andes in Extreme Rainfall events over Southern South America
%D 2006
%A Weykamp, Fabiana Victória,
%A Ambrizzi, Tércio,
%@affiliation Universidade de São Paulo
%@electronicmailaddress fabivw@model.iag.usp.br
%@electronicmailaddress ambrizzi@model.iag.usp.br
%E Vera, Carolina,
%E Nobre, Carlos,
%B International Conference on Southern Hemisphere Meteorology and Oceanography, 8 (ICSHMO).
%C Foz do Iguaçu
%8 24-28 Apr. 2006
%I American Meteorological Society (AMS)
%J 45 Beacon Hill Road, Boston, MA, USA
%P 1231-1234
%S Proceedings
%1 American Meteorological Society (AMS)
%K Extreme Precipitation Events, Low-Level Jet.
%X Heavy daily precipitation events are of particular interest because of their immediate and potential dramatic impacts. Although there are many works in the literature about the occurrence of extreme precipitation events in the southern South America, its relationship with the Low-Level Jet East of the Andes (SALLJ) is less studied. The aim of this study is to investigate the relationship of the daily extreme precipitation events with the position, intensity and duration of the SALLJ. Hereby, it concentrates on the components of the circulation, convection and moisture transport of the Amazon region towards the south of the continent, focusing especially on the La Plata basin region. Precipitation data from approximately 1500 surface stations and the reanalysis gridded data of the NCEP-NCAR for the period November to March, from 1979 to 1998, are used in this study. An extreme event is defined here when daily rainfall exceed the 95th percentile. In order to identify the SALLJ events the Bonner criterion 1 was applied in site 20°S-60°W. The related dynamic aspects to the patterns observed in the atmospheric circulation since the surface up to high tropospheric levels for the simultaneous and unbalanced days of occurrence of extreme precipitation events and of the SALLJ had been analyzed through composites of diverse anomaly fields. It was found that the extreme events and the SALLJ are well correlated with each other as well as with high and low frequency systems from midlatitudes..
%9 Monsoon systems and continental rainfall
%@language en
%3 1231-1234.pdf