Study of unusual atmospheric icing at Mount Zao, Japan, using the Weather Research and Forecasting model

Evgeny Andreevich Podolskiy (Corresponding Author), Bjorn Egil Kringlebotn Nygaard, Kouichi Nishimura, Lasse Makkonen, Edward Peter Lozowski

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Abstract

A mesoscale atmospheric model, the Weather Research and Forecasting model (WRF), was used for a case study that reconstructs mid‐spring episodes of rime formation at Mt. Zao, Japan. One particularly interesting and rare form of rime was observed. The formations were feathery, opaque aggregates of granular ice 15–30 cm long, called “shrimp tails” in Japanese. Based on an analysis of model‐generated results, we find good quantitative agreement of modeled and observed wind and temperature time series at Jizosancho ropeway station. We identified two icing events (lasting for 36 and 41 h respectively, with surface air temperatures between −6.3° and −0.1°C, relatively constant westerly winds up to 26 m s−1, and maximum cloud liquid water contents (LWC) between 0.72 and 1.05 g m−3). We confirmed that high‐resolution modeling (1.1 km grid spacing) was much more accurate than simulations with coarser grids (10 and 3.3 km). The LWC during the formation period of this rare type of icing was estimated for the first time using the WRF model at Mt. Zao, and it was found to be up to several times higher than values previously used in experimental studies. We found that the joint wind speed‐air temperature distribution for this type of “tail” rime was more similar to that of a hard rime or glaze, than to a soft rime. We explain the formation of “shrimp tails” by wind impact angle and report previously made laboratory results on its effect on the droplet collision efficiency and the density of rime ice.
Original languageEnglish
Article numberD12106
Number of pages24
JournalJournal of Geophysical Research
Volume117
Issue number12
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

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rime
ice formation
weather
forecasting
Japan
Ice
tail
Water content
moisture content
ice
grids
glazes
shrimp
Glazes
atmospheric models
Liquids
water content
liquids
Time series
Temperature distribution

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Podolskiy, Evgeny Andreevich ; Nygaard, Bjorn Egil Kringlebotn ; Nishimura, Kouichi ; Makkonen, Lasse ; Lozowski, Edward Peter. / Study of unusual atmospheric icing at Mount Zao, Japan, using the Weather Research and Forecasting model. In: Journal of Geophysical Research. 2012 ; Vol. 117, No. 12.
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abstract = "A mesoscale atmospheric model, the Weather Research and Forecasting model (WRF), was used for a case study that reconstructs mid‐spring episodes of rime formation at Mt. Zao, Japan. One particularly interesting and rare form of rime was observed. The formations were feathery, opaque aggregates of granular ice 15–30 cm long, called “shrimp tails” in Japanese. Based on an analysis of model‐generated results, we find good quantitative agreement of modeled and observed wind and temperature time series at Jizosancho ropeway station. We identified two icing events (lasting for 36 and 41 h respectively, with surface air temperatures between −6.3° and −0.1°C, relatively constant westerly winds up to 26 m s−1, and maximum cloud liquid water contents (LWC) between 0.72 and 1.05 g m−3). We confirmed that high‐resolution modeling (1.1 km grid spacing) was much more accurate than simulations with coarser grids (10 and 3.3 km). The LWC during the formation period of this rare type of icing was estimated for the first time using the WRF model at Mt. Zao, and it was found to be up to several times higher than values previously used in experimental studies. We found that the joint wind speed‐air temperature distribution for this type of “tail” rime was more similar to that of a hard rime or glaze, than to a soft rime. We explain the formation of “shrimp tails” by wind impact angle and report previously made laboratory results on its effect on the droplet collision efficiency and the density of rime ice.",
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Study of unusual atmospheric icing at Mount Zao, Japan, using the Weather Research and Forecasting model. / Podolskiy, Evgeny Andreevich (Corresponding Author); Nygaard, Bjorn Egil Kringlebotn; Nishimura, Kouichi; Makkonen, Lasse; Lozowski, Edward Peter.

In: Journal of Geophysical Research, Vol. 117, No. 12, D12106, 2012.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Podolskiy, Evgeny Andreevich

AU - Nygaard, Bjorn Egil Kringlebotn

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AU - Makkonen, Lasse

AU - Lozowski, Edward Peter

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N2 - A mesoscale atmospheric model, the Weather Research and Forecasting model (WRF), was used for a case study that reconstructs mid‐spring episodes of rime formation at Mt. Zao, Japan. One particularly interesting and rare form of rime was observed. The formations were feathery, opaque aggregates of granular ice 15–30 cm long, called “shrimp tails” in Japanese. Based on an analysis of model‐generated results, we find good quantitative agreement of modeled and observed wind and temperature time series at Jizosancho ropeway station. We identified two icing events (lasting for 36 and 41 h respectively, with surface air temperatures between −6.3° and −0.1°C, relatively constant westerly winds up to 26 m s−1, and maximum cloud liquid water contents (LWC) between 0.72 and 1.05 g m−3). We confirmed that high‐resolution modeling (1.1 km grid spacing) was much more accurate than simulations with coarser grids (10 and 3.3 km). The LWC during the formation period of this rare type of icing was estimated for the first time using the WRF model at Mt. Zao, and it was found to be up to several times higher than values previously used in experimental studies. We found that the joint wind speed‐air temperature distribution for this type of “tail” rime was more similar to that of a hard rime or glaze, than to a soft rime. We explain the formation of “shrimp tails” by wind impact angle and report previously made laboratory results on its effect on the droplet collision efficiency and the density of rime ice.

AB - A mesoscale atmospheric model, the Weather Research and Forecasting model (WRF), was used for a case study that reconstructs mid‐spring episodes of rime formation at Mt. Zao, Japan. One particularly interesting and rare form of rime was observed. The formations were feathery, opaque aggregates of granular ice 15–30 cm long, called “shrimp tails” in Japanese. Based on an analysis of model‐generated results, we find good quantitative agreement of modeled and observed wind and temperature time series at Jizosancho ropeway station. We identified two icing events (lasting for 36 and 41 h respectively, with surface air temperatures between −6.3° and −0.1°C, relatively constant westerly winds up to 26 m s−1, and maximum cloud liquid water contents (LWC) between 0.72 and 1.05 g m−3). We confirmed that high‐resolution modeling (1.1 km grid spacing) was much more accurate than simulations with coarser grids (10 and 3.3 km). The LWC during the formation period of this rare type of icing was estimated for the first time using the WRF model at Mt. Zao, and it was found to be up to several times higher than values previously used in experimental studies. We found that the joint wind speed‐air temperature distribution for this type of “tail” rime was more similar to that of a hard rime or glaze, than to a soft rime. We explain the formation of “shrimp tails” by wind impact angle and report previously made laboratory results on its effect on the droplet collision efficiency and the density of rime ice.

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JO - Journal of Geophysical Research

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ER -