Bulletin of Glaciological Research
Online ISSN : 1884-8044
Print ISSN : 1345-3807
ISSN-L : 1345-3807
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)
NIWANO Masashi(庭野匡思)AOKI Teruo(青木輝夫)KUCHIKI Katsuyuki(朽木勝幸)HOSAKA Masahiro(保坂征宏)KODAMA Yuji(兒玉裕二)YAMAGUCHI Satoru(山口悟)MOTOYOSHI Hiroki(本吉弘岐)IWATA Yukiyoshi(岩田幸良)
ジャーナル フリー

2014 年 32 巻 p. 65-78


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.

© 2014 公益社団法人 日本雪氷学会
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