Evaluation of updated physical snowpack model SMAP（アップデートした積雪変質モデルSMAPの精度評価）

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概要

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• The 1D multilayered physical snowpack model Snow Metamorphism and Albedo Process (SMAP), which was originally designed for climate studies, is now updated by incorporating a detailed water movement scheme, realistic snow settlement process and limitation for the Richardson number to ensure minimum turbulent exchanges even under highly stable atmospheric conditions.　The evaluation of the updated version of SMAP was first performed using the data obtained at Sapporo, Japan, during the 2007-2009 winters and the effectiveness of these updates was demonstrated in terms of snow depth and snow surface temperature.　However, we pointed out that the choice of maximum Richardson number should be further examined.　To test the reliability of SMAP under different climate conditions, we applied it to Naga oka, Japan, during the 2011-2012 winter.　At Nagaoka, we performed snow-soil-coupled simulations, because ground heat flux was not available during the study period.　For this purpose, we developed a soil submodel for SMAP. Consequently, we confirmed that the updated version performed better than the old version in terms of mass balance simulations at Nagaoka too.　Although mass balance-related parameters of the snowpack simulated by the updated version agreed well with observations during the accumulation period, the model substantially overestimated snow depth, as well as column-integrated snow water equivalent during the ablation period.　By discussing the reasons for these discrepancies, we highlighted that further investigation on snow-melt processes for thick seasonal snowpack is necessary.

• 公益社団法人 日本雪氷学会の論文

著者

• IWATA Yukiyoshi（岩田幸良）

  National Institute for Rural Engineering, National Agriculture and Food Research Organization

• KODAMA Yuji（兒玉裕二）

  National Institute of Polar Research

• AOKI Teruo（青木輝夫）

  Meteorological Research Institute

• KUCHIKI Katsuyuki（朽木勝幸）

  Meteorological Research Institute

• NIWANO Masashi（庭野匡思）

  Meteorological Research Institute

• YAMAGUCHI Satoru（山口悟）

  Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Prevention

• NIWANO Masashi（庭野匡思）

  Meteorological Research Institute, Japan Meteorological Agency

• MOTOYOSHI Hiroki（本吉弘岐）

  Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Prevention

• HOSAKA Masahiro（保坂征宏）

  Meteorological Research Institute, Japan Meteorological Agency

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• Glaciological observations in 2012 and 2013 at SIGMA-A site, Northwest Greenland（北西グリーンランド , SIGMA-Aサイトにおける 2012年, 2013年の雪氷調査）
• Evaluation of updated physical snowpack model SMAP（アップデートした積雪変質モデルSMAPの精度評価）

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