| 土壤温湿状况对黄河源区水循环过程的影响 |
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| 引用本文： | 彭雯,高艳红,王婉昭.土壤温湿状况对黄河源区水循环过程的影响[J].地球科学进展,2012,27(11):1252-1261. |
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| 作者姓名： | 彭雯 高艳红 王婉昭 |
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| 作者单位： | 1. 中国科学院寒区旱区环境与工程研究所陆面过程与气候变化重点实验室,甘肃兰州730000 湖北省气象局公众气象服务中心,湖北武汉430074
2. 中国科学院寒区旱区环境与工程研究所陆面过程与气候变化重点实验室,甘肃兰州,730000 |
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| 基金项目： | 中国科学院知识创新工程重要方向项目“黄河源区陆面过程对水资源变化的影响研究”，国家重点基础研究发展计划项目“青藏高原沙漠化对全球变化的响应”，中国科学院百人计划项目“全球变化背景下青藏高原周边典型流域气候变化研究”资助 致谢:数值计算得到了中国科学院超级计算兰州分中心的支持和帮助;特此感谢 |
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| 摘 要： | 众多研究表明黄河源区受气候变化影响,土壤活动层逐渐下降。土壤温、湿度是陆面过程及地球系统中的重要物理量,它们通过影响地表能量和物质交换而影响大气环流和降水等。利用WRF（Weather Research and Forecasting）模式,选取2个典型年分别设计了2个控制试验和2个敏感性试验来探讨土壤初始状况变化对区域水循环的影响,通过再循环降水率定量描述不同气候背景下陆面对黄河源区水循环的影响,并尝试从环流角度进一步分析土壤初始状况改变对源区水循环影响的物理机制。结果表明：陆面对水循环的影响受大尺度环流背景场影响较大,较弱的环流背景下再循环降水率较强环流背景大5%左右。土壤初始状况对水循环要素有一定程度的影响。土壤初始温度升高/降低,水汽通量增多/减少,后期降水增大/减小。不同环流背景下,土壤记忆时间不同,在弱的环流背景下,土壤记忆时间要长,初始状况扰动可持续1～2个月。
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| 关 键 词： | 土壤状况 黄河源区 水循环 再循环降水率 |
Impact of Different Initial Soil Conditions on the Water Cycle of Yellow River Source Region |
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| Peng Wen,Gao Yanhong,Wang Wanzhao.Impact of Different Initial Soil Conditions on the Water Cycle of Yellow River Source Region[J].Advance in Earth Sciences,2012,27(11):1252-1261. |
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| Authors: | Peng Wen Gao Yanhong Wang Wanzhao |
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| Institution: | 1.Key Laboratory of Land Surface Process and Climate Change , Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou 730000，China;
2.Public Weather Service Center of the Hubei Provincial Meteorological Bureau，Wuhan 430074，China |
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| Abstract: | Many studies show that affected by climate change，the soil active layer of the Yellow River source region gradually decreased. Soil temperature and moisture are important physical elements in land surface process and earth system. They have influence on the atmospheric circulation and precipitation through affecting surface energy and mass exchanges. In this paper, two control experiments were conducted for two typical warm/cold climate seasons using the Weather Research and Forecasting model (WRF). Meanwhile, two sensitive simulations were designed to discuss the impact different initial soil conditions on the regional water cycle. The precipitation recycling ratio is considered as an index to explore the impact of land surface process impact on water cycle. We further explore the possible physical mechanism of the impact from the circulation. The following results are obtained. Large-scale circulation has large control on the land effect on the water cycle. The precipitation recycling ratio is about 5% larger in a weaker circulation than in a stronger one. Initial soil conditions have a certain extent impact on the water cycle elements. Warmer/cooler initial soil temperatures make water vapor flux, and post-precipitation increase/decrease. Soil has different memory under different atmospheric circulation. It is longer in a weaker circulation than stronger one. Soil initial condition perturbations can sustain from one month to two months. |
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| Keywords: | Soil regime Yellow River source region Water cycle Precipitation recycling ratio |
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