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

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.

发文机构：Centro Polar e Climático Climatic Change Institute

关键词：ANTARCTICAAMAZONSouthAmericanlow-leveljet(SALLJ)CYCLOGENESIS

分类号： P461[天文地球—大气科学及气象学]