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An overview of precipitation climatology in Brazil: space-time variability of frequency and intensity associated with atmospheric systems
Hydrological Sciences Journal ( IF 3.5 ) Pub Date : 2021-01-13 , DOI: 10.1080/02626667.2020.1863969
Wanderson Luiz-Silva 1, 2 , Antonio Carlos Oscar-Júnior 3 , Iracema Fonseca Albuquerque Cavalcanti 4 , Felipe Treistman 5
Affiliation  

ABSTRACT

The climatic characteristics of Brazil present marked spatial and temporal precipitation contrasts, which are reviewed according to four main indices: PRCPTOT – total precipitation; Rmm – number of days with precipitation; Rx1day – maximum 1-day precipitation; and SDII – simple precipitation intensity index. The study used data for 12 hydrographic basins from 1975 to 2005. The seasonal distribution of these precipitation indices in Brazil is summarized concerning the main atmospheric systems acting in South America. The austral summer and autumn present the maximum PRCPTOT, Rmm, and Rx1day, related to the South American Monsoon System and Intertropical Convergence Zone. However, in the winter, the extreme northern and eastern coast also present high Rx1day. Maximum values of SDII occur during the four seasons in southwestern Brazil, related to mesoscale convective complexes. Precipitation anomalies are also affected by the sea surface temperature of the Tropical Southern Atlantic and Equatorial Pacific Oceans.



中文翻译:

巴西降水气候学概述:与大气系统有关的频率和强度的时空变化

摘要

巴西的气候特征呈现出明显的时空降水差异,并根据四个主要指标进行了回顾:PRCPTOT –总降水量;Rmm –降水天数;Rx1day –最多1天的降水量;SDII –简单的降水强度指数。该研究使用了1975年至2005年的12个水文流域的数据。总结了巴西这些降水指数的季节性分布,涉及南美的主要大气系统。夏季的南方和秋季以南美洲季风系统和热带辐合带为中心,PROCPTOT,Rmm和Rx1day最高。但是,在冬季,极端北部和东部海岸的Rx1天也很高。SDII的最大值出现在巴西西南部的四个季节,与中尺度对流复合体有关。降水异常也受到热带南部大西洋和赤道太平洋海洋表面温度的影响。

更新日期:2021-02-16
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