Assessments of moisture fluxes east of the Andes in South America in a global warming scenario

Assessments of moisture fluxes east of the Andes in South America in a global warming scenario
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全球变暖情景下南美洲安第斯山脉以东的水分通量评估

DOI:
10.1002/joc.1800
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发表时间:
2008
期刊:
International Journal of Climatology
影响因子:
--
通讯作者:
Soares W
Soares W
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--
文献类型:
--
作者:
Soares W

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英国Hadley中心的HadRM 3 P区域模式被用来评估南美洲安第斯山脉以东两个时期的水汽通量和低空急流(LLJ):第一个时期可以被理解为当前气候,涵盖1980 - 1989年;第二个阶段涵盖了政府间气候变化专门委员会(IPCC)排放情景特别报告(SRES)A2高预测的未来全球变暖气候下的2080 - 2089年,排放情景。分析结果考虑了低层大气中垂直积分的水汽输送和南美洲两个核心地区-亚马逊流域和拉普拉塔河流域之间的水汽通量。为了分析安第斯山脉以东的水分输送,根据风速和垂直风切变,按照用于定义LLJ的修正的Bonner标准1,建立了南美LLJ的复合材料。沿沿着两个盆地的横向边界的积分表明,可能有一个更强烈的水汽输送从热带地区提供给中尺度对流系统在亚热带拉普拉塔盆地在IPCC A2的情况下,与目前相比。这是因为向南的强烈气流与更快的低空急流相关,从亚马逊盆地向南带来更多水分。还观察到,LLJ的存在影响了亚马逊盆地当前气候和温暖气候下的水分辐合。在未来高排放情景A2中,全球变暖气候中更强烈的LLJ表明,与目前相比,从安第斯山脉北部到东南部的水分输送增加。版权所有© 2008皇家气象学会
The HadRM3P regional model from the UK Hadley Centre has been used to assess the moisture flux and the low-level jet (LLJ) east of the Andes in South America over two time periods: the first can be understood as the current climate and covers the period from 1980 to 1989; the second covers the period from 2080 to 2089 under a future global warming climate as projected by the Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) A2 high-emission scenario. The results are analyzed considering the vertically integrated moisture transport in the lower atmosphere and the moisture flux between the two core areas of South America–the Amazon Basin and the La Plata River Basin. In order to analyze the moisture transport east of the Andes, composites of South American LLJs were built based on the wind speed and vertical wind shear following the modified Bonner criteria 1 used to define LLJs. Integrations along the lateral boundaries of the two basins show that there could be a more intense moisture transport from tropical regions available to feed the mesoscale convective systems in the subtropical La Plata Basin in the IPCC A2 scenario, as compared to the present. This is because of the intense flow to the south associated with a faster LLJ bringing more moisture from the Amazon Basin southwards. It was also observed that the presence of the LLJ affects moisture convergence in the Amazon Basin in the current climate as well as in the warmer climate. In the future high-emission scenario A2, a more intense LLJ in a global warming climate suggests increased moisture transport from north to south east of the Andes as compared to the present. Copyright 2008 Royal Meteorological Society
DOI: --
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发表时间: 2003
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发表时间: 2006
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