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首页> 外文期刊>International Journal of Climatology: A Journal of the Royal Meteorological Society >Climate change impacts on reference crop evapotranspiration in North-West hydrological region of Bangladesh
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Climate change impacts on reference crop evapotranspiration in North-West hydrological region of Bangladesh

机译：气候变化对孟加拉西北水文地区参考作物蒸散量的影响

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摘要

Climate change is a critical global environmental challenge that has rigorous impacts on crop-water demand and a number of other systems, such as hydrological systems and ecosystems. Reference crop evapotranspiration (ETo) being a hydrological parameter reflects the integrated effects of various climatic parameters. Consequently, any variations in the climatic parameters induce variability in ETo. This study identified the accountable climatic parameters for the variability of ETo in Dinajpur and Bogra districts of the North-West hydrological region of Bangladesh. ETo was determined by FAO Penman-Monteith method from the daily weather parameters of the two districts for a period of 21 years (1990-2010). Trends of ETo and its governing climatic parameters over the years were detected and quantified. Correlations between ETo and the governing parameters were determined. The results revealed decreasing trends of ETo in most of the months of the year during the study period in both districts. The climatic parameters causing the observed trends in ETo differed over the months of the year. The combine effects of decreasing net radiation and wind speed, and increasing mean daily air temperature and saturation vapour pressure deficit contributed reducing ETo in the study area. These results, by enhancing our understanding of the effects of climate variability and climate change on ETo, will help sustainable planning of water resources utilization in agriculture of the region.
机译：气候变化是全球性的关键环境挑战，对作物的需水量和许多其他系统（如水文系统和生态系统）产生了严峻影响。参考作物的蒸散量（ETo）是水文参数，反映了各种气候参数的综合作用。因此，气候参数的任何变化都会引起ETo的变化。这项研究确定了孟加拉西北水文地区迪纳伊布尔和博格拉地区ETo的变化的可靠气候参数。 ETO是根据粮农组织Penman-Monteith方法从两个地区21年（1990-2010年）的每日天气参数确定的。多年来对ETo的趋势及其控制的气候参数进行了检测和量化。确定了ETo与控制参数之间的相关性。结果显示，在研究期间，这两个地区在一年中的大部分月份内，ETo的趋势都在下降。导致观测到的ETo趋势的气候参数在一年中的几个月中有所不同。减少净辐射和风速以及增加平均每日气温和饱和蒸气压赤字的综合作用有助于减少研究区域的ETo。这些结果通过加深我们对气候变率和气候变化对ETo的影响的理解，将有助于对该地区农业水资源利用的可持续规划。

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