Applicability of CRU high-resolution grid precipitation data in Haihe River basin
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Abstract:
Under the premise of climate change and the intensification of human activities,precipitation on a global scale shows obvious regional changes,has a certain impact on the natural environment and the development of human society.Therefore,studying the changes and laws of regional precipitation can not only promote the understanding of regional water cycle changes,but also have important significance for regional water resources protection,ecological construction,and sustainable and healthy economic development.The study of the hydrological cycle under climate change requires a long series of precipitation data,and the insufficient length of the existing data series is one of the main obstacles to climate change-related research. CRU applicability in the Haihe River basin (HRB) was analyzed from the perspectives of areal rainfall and site rainfall.To evaluate its system,the selected evaluation index is Pearson correlation coefficient (R),root mean square error (RMSE),mean absolute error (MAE),and bias. The applicability of CRU data in the Zhanghe River subbasin of the HRB is better than that of the entire HRB,and the evaluation results have reached the expected expectations.The mutation and periodicity test results are consistent with the previous analysis results based on the measured data.The difference in station density of the two river basins,the data processing method,and the error in the data itself make the evaluation results of the area rainfall of the two basins have a certain difference.Simultaneously,because CRU is 05° grid data,the HRB is affected by factors such as the limitation of the number of stations and the grid coverage area when the data is produced,which has certain limitations for restoring the measured data of the stations.Especially after 1990,there will be certain errors in the quality of the restored site data,which should be considered when using it in the future. CRU data can better reflect the rainfall change characteristics of the HRB and its subbasins,and compared to the HRB,CRU data in its subbasin of Zhanghe basin is more reliable.However,due to changes in the global observation sites of CRU data,the method of restoration and the uncertainty of the data itself should be fully considered when using the CRU data to research and restore the measured data at the site,especially after 1990.
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