Tropical-Antarctic connections of an explosive cyclone in southern Brazil:rainfall stable isotope ratios and atmospheric analysis  

作　　者：Pedro Amaral REIS Francisco Eliseu AQUINO Venisse SCHOSSLER Ronaldo Torma BERNARDO Jefferson Cardia SIMOES 

机构地区：[1]Centro Polar e Climático,Instituto de Geociências,Universidade Federal do Rio Grande do Sul,91501-970,Porto Alegre,Rio Grande do Sul,Brazil [2]Climatic Change Institute,University of Maine,Orono,ME,USA

出　　处：《Advances in Polar Science》2020年第2期103-111,共9页极地科学进展（英文版）

基　　金：supported by grants from the INCT da Criosfera—Instituto Nacional de Ciência e Tecnologia da Criosfera(Research Support Foundation of Rio Grande do Sul—FAPERGS project,Grant no.17/25510000518-0);Geography Graduate Program(POSGEA/UFRGS)and Coordination for the Improvement of Higher Education Personnel(CAPES)。

摘　　要：This study analyzes the stable isotopic ratio(δ18 O)and the synoptic characteristics of a precipitation event that occurred in the southernmost state of Brazil,Rio Grande do Sul,a region sensitive to explosive cyclogenesis in years with enhanced tropic-pole interactions.The main objective was to evaluate the influence of tropical and Antarctic climate systems on the event.Cavity ring-down spectroscopy was used for the water isotopic analysis,and NCEP CFSv2 data were employed for the synoptic analysis of rainfall over a 48-h period.An Amazonian isotopic signature on precipitated water was identified.A strong,low-level meridional flow from the Amazon Basin,combined with the development of a frontal system,resulted in intense cyclogenesis that generated an explosive cyclone.

关 键 词：ANTARCTICA AMAZON South American low-level jet(SALLJ) CYCLOGENESIS 

分 类 号：P461[天文地球—大气科学及气象学]