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  Estimation of seasonal snow mass balance in Japan with a high-resolution snow cover simulation system by Japan Meteorological Agency

Niwano, M., Suya, M., Nagaya, K., Yamaguchi, S., Matoba, S., Harada, I., Ohkawara, N. (2023): Estimation of seasonal snow mass balance in Japan with a high-resolution snow cover simulation system by Japan Meteorological Agency, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3167

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020484 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020484_1
Genre: Conference Paper

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 Creators:
Niwano, Masashi1, Author
Suya, Masami1, Author
Nagaya, Koichi1, Author
Yamaguchi, Satoru1, Author
Matoba, Sumito1, Author
Harada, Ikuo1, Author
Ohkawara, Nozomu1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The coastal areas in Japan that face the Sea of Japan is exposed to the cold and dry winter northwesterly monsoon. This air flow obtains large amount of moisture from the relatively warm Sea of Japan, resulting in enormous snowfall and snow water equivalent (SWE) especially in the mountainous region. However, reliable quantitative information on seasonal snow cover in Japan is still lacking. These motivated us to develop a coupled system that consists of the Japan Meteorological Agency (JMA)’s operational convection-permitting regional atmospheric model Local Forecast Model (LFM), Radar/Raingauge-Analyzed Precipitation (R/A) data, as well as the snow physics model Snow Metamorphism and Albedo Process (SMAP). The horizontal resolution of the current system is 1 km. We have evaluated the system in terms of SWE and confirmed that the obtained normalized root mean square error and normalized bias fall within the range of the snow model performances previously reported by the ESM-SnowMIP project. Numerical model simulations with the system during the 2017–2022 winters indicate that the seasonal peak area-integrated SWE in Japan reaches 42.2 Gt on average. It is unveiled that the 2017–2022 five-year-averaged March snow-covered-area-average SWE is 228 mm, which is 2.3 times higher than the 1980–2018 snow-covered-area-average SWE for the Northern Hemisphere above 40° N. We also highlight that the system has been used in JMA operationally since the 2022–2023 winter, where Snow Depth Analysis and Snowfall Amount Analysis, and Very Short-range Forecasts of Snow with a spatial resolution of 5km are issued hourly (https://www.jma.go.jp/bosai/en_snow/).

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-3167
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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