Validation of APHRODITE Precipitation Data for Humid and Sub Humid Regions of Pakistan
Validation of APHRODITE Precipitation Data for Humid and Sub Humid Regions of Pakistan
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巴基斯坦湿润和半湿润地区阿芙罗狄蒂降水数据的验证
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. B. Cheema
中科院分区：
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作者：
Gohar Ali;G. Rasul;T. Mahmood;Q. Zaman;S. B. Cheema
利用人类与自然研究所（RIHN）和日本气象厅气象研究所（MRI/JMA）以0.05度分辨率为巴基斯坦开发的亚洲降水高分辨观测资料整合用于水资源评价（APHRODITE’s水资源）资料，对巴基斯坦湿润和亚湿润地区进行了年代际分析。在1971 - 2007年的年代际基础上，建立了阿芙罗狄特和观测日降水数据集的散点图。不同台站在不同年代的相关系数（R2）值从非常差（例如Kotli， 2001-2007年为0.001）到非常好（例如Astore， 2001-2007年为0.98）不等。在年代际基础上对两个数据集的月总量进行平均，并再次构建散点图。在这种情况下，相关系数（R2）的结果远远好于逐日降水数据集的结果。在平均月分析中，伊斯兰堡和Kotli的日降水数据集的相关性非常差，超过98%。还计算了该地区每个站点的两个降水数据集之间的偏差。分析表明，阿佛洛狄特资料低估了大多数台站在发生强降雨月份的观测资料。在7月份，穆扎法拉巴德的偏差最大可达271毫米。在降雨量小的地方，偏差较小。一些台站也记录了对阿芙罗狄特降水数据的略微高估。1971-1980年10年间，伊斯兰堡3月对阿芙罗狄蒂降水资料的最大高估（约40毫米）。
The Asian Precipitation Highly Resolved Observed Data Integration Towards Evaluation of water resources (APHRODITE’s water resources) data developed for Pakistan on a 0.05 degree resolution by Research Institute for Humanity and Nature (RIHN) and the Meteorological Research Institute of Japan Meteorological Agency (MRI/JMA), was analyzed on decadal basis for the humid and sub humid regions of Pakistan. Scatter plots of both the APHRODITE and observed daily precipitation datasets were constructed on decadal basis from 1971 to 2007. The coefficient of correlation (R2) values vary from very poor (e.g. 0.001 for Kotli, 2001–2007) to very good (e.g.0.98 for Astore, 2001–2007) for different stations in various decades. Monthly totals of both the datasets were averaged on decadal bases and scatter plots were again constructed. In this case the correlation coefficient (R2) results are far better than those determined for daily precipitation datasets. The very poor correlation results in case of daily precipitation datasets for Islamabad and Kotli are more than 98% in case of mean monthly analysis. Biases between the two precipitation datasets were also calculated for every station in the region. This analysis shows that the APHRODITE data underestimates the observed data for most of the stations in those months in which heavy rainfall occurs. This bias reaches up to a maximum of 271mm for Muzaffarabad in the month of July. The bias is less where the rainfall amount is small. A slight overestimation of APHRODITE precipitation data has also been recorded for some stations. The maximum overestimation of APHRODITE precipitation data (about 40mm) was observed for Islamabad in the month of March for the decade 1971–1980.