Statistical Downscaling of AGCM60km Precipitation based on Spatial Correlation of AGCM20km Output

IF 0.6 Q4 WATER RESOURCES

Hydrological Research Letters Pub Date : 2017-01-01 DOI:10.3178/HRL.11.58

Sunmin Kim, Y. Tachikawa, E. Nakakita

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引用次数: 1

Abstract

: A statistical downscaling method based on regressing precipitation data is introduced and applied to 60-km resolution Atmospheric General Circulation Model (AGCM60km) output for daily precipitation. The method utilizes a regression domain with a 3×3 60-km grid, and the downscaling target is 3×3 20-km grids in the center of the regression domain. By shifting the regression domain one grid by one grid in 60-km resolution, the same form of regression model, but different regression coefficients for each 20-km grid, can be applied to all the downscaling target areas. Based on application tests for the Asian Monsoon region, the statistical downscaling algorithm shows extremely effective results with a certain pattern of regression error. The monthly based downscaled results from AGCM60km output shows a rather good match to the monthly mean precipitation amount of AGCM20km. The downscaled results also show a plausible mimic to the AGCM20km output in the frequency of daily precipitation amounts; however, the results showed noticeable limitations in simulating low rainfall amounts (e.g., less than 5 mm d –1 ), especially on land.

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基于AGCM20km输出空间相关性的AGCM60km降水统计降尺度

:介绍了一种基于降水数据回归的统计降尺度方法，并将其应用于60km分辨率大气环流模式(AGCM60km)的日降水输出。该方法利用3×3 60 km网格的回归域，降尺度目标为回归域中心的3×3 20 km网格。通过在60 km分辨率下逐格移动回归域，可以将相同形式的回归模型应用于所有降尺度目标区域，但每个20 km网格的回归系数不同。在亚洲季风区的应用试验表明，统计降尺度算法在一定的回归误差模式下取得了非常有效的结果。AGCM60km的月平均降水量与AGCM20km的月平均降水量具有较好的匹配关系。缩小后的结果在日降水量频率上也显示出与AGCM20km输出的似是而非的模拟;然而，结果显示在模拟低降雨量(例如小于5毫米d -1)方面有明显的局限性，特别是在陆地上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrological Research Letters WATER RESOURCES-

CiteScore

1.90

自引率

18.20%

发文量

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.