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

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)

    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

    Fingerprint

    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

    Cite this

    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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    title = "Study of unusual atmospheric icing at Mount Zao, Japan, using the Weather Research and Forecasting model",
    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.",
    author = "Podolskiy, {Evgeny Andreevich} and Nygaard, {Bjorn Egil Kringlebotn} and Kouichi Nishimura and Lasse Makkonen and Lozowski, {Edward Peter}",
    year = "2012",
    doi = "10.1029/2011JD017042",
    language = "English",
    volume = "117",
    journal = "Journal of Geophysical Research",
    issn = "0148-0227",
    publisher = "Wiley-Blackwell",
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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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    T1 - Study of unusual atmospheric icing at Mount Zao, Japan, using the Weather Research and Forecasting model

    AU - Podolskiy, Evgeny Andreevich

    AU - Nygaard, Bjorn Egil Kringlebotn

    AU - Nishimura, Kouichi

    AU - Makkonen, Lasse

    AU - Lozowski, Edward Peter

    PY - 2012

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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.

    U2 - 10.1029/2011JD017042

    DO - 10.1029/2011JD017042

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    VL - 117

    JO - Journal of Geophysical Research

    JF - Journal of Geophysical Research

    SN - 0148-0227

    IS - 12

    M1 - D12106

    ER -