山地森林流域潜在蒸散对气候因子的敏感性

IF 0.6 Q4 WATER RESOURCES Hydrological Research Letters Pub Date : 2019-01-01 DOI:10.3178/HRL.13.41
Fereshteh Ghiami-Shomami, Kohzo Kawasaki, Leonardo, S. Shinoda, Yan Fan
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引用次数: 4

摘要

参考蒸散量(ET0)的估算在水文研究中具有重要意义。由于气候变化预计会引起水资源和农业部门的变化,因此需要了解不同气候变量变化对ET0的可能影响。采用敏感性分析分析了气象参数(最高和最低气温(Tmax和Tmin)、日照时数(n)、最大和最小相对湿度(RHmax和RHmin)和风速(uz)的扰动对ET0的影响。联合国粮食及农业组织(FAO) 56 Penman-Monteith方法利用日本森林山区Enbara和Futatsumori流域1979-2017年的气候数据计算了ET0。在日、月、季、年时间尺度上量化了气候因子对ET0的贡献。每日结果显示波动很大。从逐月和季节分析来看,暖季时,Tmax和n对ET0的影响更大,特别是在5月;冷季时,RH对ET0的影响更大,特别是在12月。从历年结果来看,对蒸散量影响最大的因子依次为Tmax、n、uz、RH和Tmin。研究还发现,不同地形和地理特征的样地,ET0对气候参数变化的响应也不同。
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Sensitivity of potential evapotranspiration to climate factors in forested mountainous watersheds
Estimation of reference evapotranspiration (ET0) is important in hydrological studies. As climate change is pre‐ dicted to cause changes in water resources and agriculture sectors, the possible implications of changes in different climate variables on ET0 need to be understood. Sensitivity analysis was employed to illustrate the effects of perturba‐ tion in meteorological parameters (maximum and minimum air temperature (Tmax and Tmin), sunshine hours (n), maxi‐ mum and minimum relative humidity (RHmax and RHmin)) and wind speed (uz) on ET0. ET0 was calculated by The Food and Agriculture Organization of the United Nations (FAO) 56 Penman-Monteith approach using climate data from 1979–2017 for the Enbara and Futatsumori water‐ sheds in forested mountain areas in Japan. We quantified the contributions of climatic factors to ET0 at daily, monthly, seasonal and annual time scales. Daily results showed large fluctuations. According to the monthly and seasonal analysis, during warm seasons, Tmax and n had more influence on ET0, especially in May, while for the cold seasons, RH effect was dominant, especially in December. Based on the annual results, the factors most influencing ET0 were Tmax followed by n, uz, RH and Tmin. We also found that the response of ET0 to changes in cli‐ matic parameters differs for sites with different topographic and geographic characteristics.
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来源期刊
CiteScore
1.90
自引率
18.20%
发文量
9
审稿时长
10 weeks
期刊介绍: Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.
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