Importance in Shifting Circulation Patterns for Dry Season Moisture Sources in the Brazilian Amazon
Importance in Shifting Circulation Patterns for Dry Season Moisture Sources in the Brazilian Amazon
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DOI：
10.1029/2023gl103167
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发表时间：
2023-05
影响因子：
5.2
通讯作者：
Ye Mu;T. Biggs;Charles Jones
中科院分区：
文献类型：
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作者：
Ye Mu;T. Biggs;Charles Jones
水通过大气水分传输从蒸发源重新分配到降雨汇。在巴西亚马逊地区，尚未对主要农业区旱季水分来源的时空变异性进行调查。这项研究调查了巴西隆多尼亚州旱季降水的水分来源，特别是在干旱年份。利用降水场框架，我们量化了罗多尼亚州(巴西亚马逊)降水中水分贡献的可变性以及天气环流模式的影响。海洋蒸发占平均旱季降水量的58%，而大陆循环占42%。在干旱年份，尽管森林保持或增加了蒸散量，但由于天气环流的变化，海洋和森林对旱季降雨量的水分贡献减少，从而减少了向罗多尼亚的水分输送。
Water is redistributed from evaporation sources to precipitation sinks through atmospheric moisture transport. In the Brazilian Amazon, the spatial and temporal variability of dry season moisture sources for key agricultural regions has not been investigated. This study investigates moisture sources for dry season rainfall in the state of Rondônia in Brazil, especially during drought years. Using a precipitationshed framework, we quantified the variability of moisture contributions to rainfall in the state of Rondônia (Brazilian Amazon) and the influence of synoptic circulation patterns. Ocean evaporation accounts for 58% of mean dry season precipitation while continental recycling contributed 42%. During drought years, although forests maintain or increase evapotranspiration, the moisture contribution of both ocean and forests to dry season rainfall decreases due to the synoptic circulation changes, reducing the moisture transport into Rondônia.