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首页> 外文期刊>Climatic Change >Spatial and temporal variability of the frequency of extreme daily rainfall regime in the La Plata Basin during the 20th century. (Special Issue: The 6th European Framework Programme CLARIS Project: a Europe-South America Network for climate changeassessment and impact studies.)
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Spatial and temporal variability of the frequency of extreme daily rainfall regime in the La Plata Basin during the 20th century. (Special Issue: The 6th European Framework Programme CLARIS Project: a Europe-South America Network for climate changeassessment and impact studies.)

机译：20世纪拉普拉塔盆地极端日降雨模式频率的时空变化。 （特刊：第六个欧洲框架计划CLARIS项目：一个用于气候变化评估和影响研究的欧洲-南美网络。）

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摘要

We analyzed trends, interdecadal variability, and the quantification of the changes in the frequency of daily rainfall for two thresholds: 0.1 mm and percentile 75th, using high quality daily series from 52 stations in the La Plata Basin (LPB). We observed increases in the annual frequencies in spatially coherent areas. This coherence was more marked in austral summer, autumn, and spring, during which the greatest increases occurred in southern Brazil, especially during extreme events. In winter, the low and middle basins of the Rio Uruguay and Rio Parana showed negative trends, some of which were significant. Interdecadal variability is well defined in the region with more pronounced positive jumps west of the basin between 1950 and 2000. This variability was particularly more marked during periods of extreme rainfall in summer, autumn, and spring, unlike in winter when extreme daily rainfall in the lower Rio Parana basin decreased by up to 60%. The changes in the past century during extreme rainfall produced modifications in the annual rainfall cycle. The annual cycle of both indices was broader during the last period which is mainly explained by the strong decreases in winter.
机译：我们使用来自拉普拉塔盆地（LPB）的52个站的高质量日序列，分析了两个阈值（0.1毫米和第75个百分位数）的趋势，年代际变化和每日降雨频率变化的量化。我们观察到空间连贯区域中年频率的增加。这种连贯性在南方的夏季，秋季和春季尤为明显，在此期间，巴西南部的增幅最大，尤其是在极端事件期间。冬季，里约乌拉圭和里约巴拉那的中低盆地呈现出负趋势，其中一些趋势显着。 1950年至2000年期间，该盆地以西地区出现明显的正跃迁，年代际变率得到了很好的定义。在夏季，秋季和春季出现极端降雨的时期，这种变异尤其明显，而冬季则是冬季极端的每日降雨。里约帕拉纳盆地下游下降最多达60％。上个世纪极端降雨期间的变化导致年度降雨周期发生变化。在最后一个时期，两个指数的年度周期都较宽，这主要是由于冬季的大幅下降。

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