Projected increases in the annual flood pulse of the Western Amazon

Projected increases in the annual flood pulse of the Western Amazon
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预计西​​亚马逊地区年度洪水脉冲将增加

DOI:
10.1088/1748-9326/11/1/014013
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发表时间:
2016
影响因子:
6.7
通讯作者:
Zulkafli Z
Zulkafli Z
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Zulkafli Z

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气候变化对亚马逊盆地的影响是一个深入研究的主题,因为亚马逊盆地生物多样性丰富,雨林在碳循环中发挥着重要作用。气候变化也对水文产生直接影响,人们越来越多地把努力的重点放在了解大陆和次区域尺度的水文动态,如西亚马逊。耦合模式相互比较项目第5阶段集合的新预测表明,秘鲁亚马逊流域的气候持续变暖,降水季节性增加。在这里,我们使用分布式陆面模型来量化这种气候变化对亚马逊河上游水文状况的潜在影响。使用极值分析,历史和未来的预测,每年的最小,平均和最大的河流流量产生的重现期范围在1年和100年之间。我们发现,RCP 4.5和8.5的气候变化方案项目的雨季洪水脉冲的严重程度增加(7.5%和12%的增加分别为100年一遇的洪水)。这些发现与先前根据《排放情景特别报告》气候预测预测的极端情况增加相一致,由于对河流物种繁殖过程、沼泽森林生态和洪泛区社会经济的潜在影响,在越来越多的文献中,更强烈地强调未来的干旱及其对雨林系统生存能力的影响,亚马逊。
The impact of a changing climate on the Amazon basin is a subject of intensive research because of its rich biodiversity and the significant role of rainforests in carbon cycling. Climate change has also a direct hydrological impact, and increasing efforts have focused on understanding the hydrological dynamics at continental and subregional scales, such as the Western Amazon. New projections from the Coupled Model Inter-comparison Project Phase 5 ensemble indicate consistent climatic warming and increasing seasonality of precipitation in the Peruvian Amazon basin. Here we use a distributed land surface model to quantify the potential impact of this change in the climate on the hydrological regime of the upper Amazon river. Using extreme value analysis, historical and future projections of the annual minimum, mean, and maximum river flows are produced for a range of return periods between 1 and 100 yr. We show that the RCP 4.5 and 8.5 scenarios of climate change project an increased severity of the wet season flood pulse (7.5% and 12% increases respectively for the 100 yr return floods). These findings agree with previously projected increases in high extremes under the Special Report on Emissions Scenarios climate projections, and are important to highlight due to the potential consequences on reproductive processes of in-stream species, swamp forest ecology, and socio-economy in the floodplain, amidst a growing literature that more strongly emphasises future droughts and their impact on the viability of the rainforest system over greater Amazonia.
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发表时间: 2009
期刊:
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