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首页> 外文期刊>International Journal of Geosciences >Rainfall Variability over Ghana: Model versus Rain Gauge Observation
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Rainfall Variability over Ghana: Model versus Rain Gauge Observation

机译：加纳的降雨变化：模型与雨量计观测

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This paper used the International Centre for Theoretical Physics (ICTP) Regional Climate Model, Version 3 (RegCM3) and rain gauge data selected from the Ghana Meteorological Agency (GMet) from 1990 to 2008 to investigate the extent and nature of variability in the annual rainfall and pattern of the raining seasons in Ghana. In the study, six meteorological stations selected from three rainfall distribution zones according to the divisions of the GMet were used to study the pattern of rainfall and its departure from the normal trend. The study also assessed the performance of the RegCM3 simulation with reference to the observed gauge data. Results confirmed the unimodal nature of the rainfall annual cycle over the northern belt and bi-modal rainfall nature over the middle and southern belts of Ghana. Negative departures of rainfall implying consistent downward trend were observed at all the stations. Our analysis showed that RegCM3 captured the average rainfall over Ghana but demonstrated an underestimation as compared to the observed gauge data. The model also had difficulty stimulating the departures accurately in direction and in magnitude in all the stations except for Accra where RegCM3 simulated the right direction of the departures.
机译：本文使用国际理论物理中心（ICTP）区域气候模型第3版（RegCM3）和1990年至2008年选自加纳气象局（GMet）的雨量计数据来调查年降水量变化的程度和性质和加纳雨季的模式。在这项研究中，根据GMet的划分，从三个降雨分布区中选择了六个气象站，以研究降雨的模式及其与正常趋势的偏离。该研究还参考观察到的量规数据评估了RegCM3仿真的性能。结果证实了加纳北部带的降雨年周期的单峰性质和加纳中南部带的双峰降雨性质。在所有台站均观测到降雨的负向偏离，表明持续下降趋势。我们的分析表明，RegCM3捕获了加纳的平均降雨量，但与观测到的标尺数据相比，其估算低了。该模型还难以在除阿克拉（RegCM3模拟正确的偏离方向）以外的所有站点中准确地刺激偏离方向和幅度。

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