Jurnal Internasional Penyesuaian harian untuk curah hujan yang disebabkan oleh angin kurang dari curah hujan grid harian di Jepang – Masuda – – Ilmu Bumi dan Luar Angkasa

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Jurnal Internasional Penyesuaian harian untuk curah hujan yang disebabkan oleh angin kurang dari curah hujan grid harian di Jepang – Masuda – – Ilmu Bumi dan Luar Angkasa

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Northern Japan facing the Sea of ​​Japan is known for heavy snowfall. Because snow is very important as a source of water, accurate measurements are needed. We developed an optimal method for adjusting wind-induced rainfall undercatch for daily gridered rainfall data based on rain in Japan. On the Japanese Meteorological Agency (JMA) surface observation network, wind speed data are not measured at all rainfall stations; therefore, we tested three approaches to implementing wind correction using four-year observation data (2009-2012). First, we interpolate corrected precipitation using only stations that measure wind; second, we define lattice correction parameters, interpolate uncorrected precipitation from all stations, and adjust lattice precipitation; third, we interpolate corrected precipitation using wind data from the JMA surface network and re-analysis at stations where wind is not measured. Analysis of water budgets in mountainous areas (dam catchment areas) shows that the best results among the three are obtained by compensating for wind speeds using high resolution meteorological re-analysis data, followed by methods that apply daily correction parameters to daily rainfall data. The best method is to increase the amount of winter rainfall (December-February) by 12.7% in northern Japan, and the bias in the annual hydrological balance is reduced from 33% to 26% above mountainous regions. Proper consideration of meta information on rain gauges, such as the presence / absence of wind shields, is very important for quantitative assessments of heavy rainfall, especially in areas with heavy snowfall such as northern Japan.

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