| 石羊河流域地表干湿变化的时空分布特征 |
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| 引用本文： | 王莺,李耀辉,姚玉璧,赵福年.石羊河流域地表干湿变化的时空分布特征[J].资源科学,2013,35(10):2112-2120. |
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| 作者姓名： | 王莺 李耀辉 姚玉璧 赵福年 |
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| 作者单位： | 中国气象局兰州干旱气象研究所, 甘肃省干旱气候变化与减灾重点实验室, 中国气象局干旱气候变化与减灾重点开放实验室, 兰州 730020;中国气象局兰州干旱气象研究所, 甘肃省干旱气候变化与减灾重点实验室, 中国气象局干旱气候变化与减灾重点开放实验室, 兰州 730020;中国气象局兰州干旱气象研究所, 甘肃省干旱气候变化与减灾重点实验室, 中国气象局干旱气候变化与减灾重点开放实验室, 兰州 730020;甘肃省定西市气象局, 定西 743003;中国气象局兰州干旱气象研究所, 甘肃省干旱气候变化与减灾重点实验室, 中国气象局干旱气候变化与减灾重点开放实验室, 兰州 730020 |
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| 基金项目： | 国家重点基础研究发展计划项目(编号: 2013CB430200,2013CB430206);国家重大科学研究计划项目(编号: 2012CB955903);中国清洁发展机制基金项目: “面向适应的气候灾害风险评估与管理机制研究”;兰州干旱气象研究所博士科研启动项目(编号: KYS2012BSKYO2);兰州干旱气象研究所科研业务费(编号: KYYWF201317) |
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| 摘 要： | 利用1960-2011年石羊河流域及周边12个气象站的逐日气象资料,采用FAO Penman-Monteith公式计算研究区各气象站的潜在蒸散发,并由此计算出各站的相对湿润度指数.在ArcGIS 9.3平台下得到区域相对湿润度指数的时空变化特征,并对影响其变化的气象要素进行了探讨.结果表明: 石羊河流域52年来有微弱变干趋势;该区相对湿润度指数自南向北逐渐增加,与降水量和海拔的空间分布比较一致,与潜在蒸散发的空间分布呈相反关系;流域大部分地区的地表相对湿润度指数倾向率呈增加趋势,增加较明显的区域位于祁连山脉附近,呈下降趋势的区域位于上游古浪县附近;流域地表相对湿润度指数在年内呈单峰型变化,1月、11月和12月最低,8月和9月最高,且随气温变暖,自流域南部向北部逐渐推移增大,当气温开始降低时,该指数又从北到南逐渐减少;石羊河流域地表干湿事件的变化与降水量、风速和相对湿度呈正相关,与潜在蒸散发、平均温度和日照时数呈负相关.
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| 关 键 词： | 石羊河流域 相对湿润度指数 潜在蒸散发 干湿状况 Penman-Monteith公式 |
Spatial and Temporal Patterns in Surface Humidity Changes in the Shiyang River Basin |
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| WANG Ying,LI Yaohui,YAO Yubi and ZHAO Funian.Spatial and Temporal Patterns in Surface Humidity Changes in the Shiyang River Basin[J].Resources Science,2013,35(10):2112-2120. |
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| Authors: | WANG Ying LI Yaohui YAO Yubi and ZHAO Funian |
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| Institution: | Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Change andDisaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Change andDisaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Change andDisaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;Meteorological Bureau of Dingxi City, Dingxi 743003, China;Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Change andDisaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China |
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| Abstract: | Potential evapotranspiration in the Shiyang River Basin and 12 surrounding meteorological stations was calculated using the FAO Penman-Monteith formula and daily meteorological data. The relative moisture index was then calculated from potential evapotranspiration. Spatiotemporal changes were analyzed with inverse distance weighting by AcrGIS 9.3 and meteorological factors affecting such changes are also discussed. The results show that there has been a weak drying trend in the Shiyang River Basin over the last 52 years. The relatively moisture index has increased gradually from south to north; precipitation and altitude spatial distribution of the spatial distribution of potential evapotranspiration follows the opposite relationship. The rate of increase in the relative moisture index shows an increasing trend in most areas, especially at Qilian Mountain. The relative humidity index peaks once during the year, and the minimum is recorded in January, November and December; the maximum value is in August and September. With warming, the relative humidity index increases gradually from south to north. Different factors have different impacts on the surface relative moisture index, showing a positive correlation with precipitation, wind speed and relative humidity, and a negative correlation with potential evapotranspiration, average temperature and hours of sunshine. |
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| Keywords: | Shiyang River Basin Relative moisture index Potential evapotranspiration Ddry and wet condition Penman-Monteith formula |
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