Nobuyuki Utsumi, Shinjiro Kanae, Hyungjun Kim, Shinta Seto, Taikan Oki, Tomoko Nitta and Yukiko Hirabayashi
Release Date: October 7, 2008

Importance of wind-induced undercatch adjustment in a gauge-based analysis of daily precipitation over Japan
Nobuyuki Utsumi1), Shinjiro Kanae1), Hyungjun Kim1), Shinta Seto1), Taikan Oki1), Tomoko Nitta1) and Yukiko Hirabayashi2)

1) Institute of Industrial Science, The University of Tokyo
2) Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi

(Received: May 26, 2008)
(Accepted for publication: July 27, 2008)

Abstract:
We produced a new gauge-based analysis of daily precipitation over Japan from 1981 to 2000 on a 0.01° grid. Wind-induced undercatch was adjusted at each observation station, and orographic effects were considered in the process of spatial interpolation from station data to the gridded product. The resulting gridded gauge-based analysis of precipitation was validated against observed river discharge data. The validation demonstrated that the product is reasonable, mostly because of the undercatch adjustment. Based on the resulting product, Japan receives nearly 2000 mm/year of precipitation on average, which is approximately 10% larger than commonly thought.

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To cite this article:
Nobuyuki Utsumi, Shinjiro Kanae, Hyungjun Kim, Shinta Seto, Taikan Oki, Tomoko Nitta and Yukiko Hirabayashi: “Importance of wind-induced undercatch adjustment in a gauge-based analysis of daily precipitation over Japan”, Hydrological Research Letters, Vol. 2, pp.47-51, (2008) .

doi:10.3178/hrl.2.47
JOI JST.JSTAGE/hrl/2.47
Copyright (c) 2008 Japan Society of Hydrology and Water Resources