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第 219回 大気海洋物理学・気候力学セミナー のおしらせ

日　時： 6月 30日(木) 午前 09:30
場　所： 環境科学院 D棟2階 D201号室

発表者： ヤッカラ ヤグネッシュ ラガヴァ (地球圏科学専攻 大気海洋物理学・気候力学コース/D3)
\\Yakkala Yagnesh Raghava (Course in atmosphere-ocean climate dynamics/DC3)
題　目： The formation mechanism of a thick snow band over the Sea of Okhotsk

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The formation mechanism of a thick snow band over the Sea of Okhotsk
\\ (ヤッカラ ヤグネッシュ ラガヴァ\\Yakkala Yagnesh Raghava) 発表要旨 :

During cold-air outbreaks in the East Asian winter-monsoon season,
a thick snow band frequently appears over the Sea of Okhotsk along 
the north face of Hokkaido Island and causes heavy snowfall locally. 
The Weather Research & Forecast Model(WRF), a non-hydrostatic model 
has been used to perform numerical simulations with high-resolution 
to investigate the underlying mechanism of the formation and evolution
of snow bands. The simulations were able to reproduce the cloud bands
captured in satellite images. The results showed that north westerly
winds blowing from the northern Sea of Japan underwent a topographical
effect over Hokkaido and Sakhalin Islands and formed a convergence
zone
over the Sea of Okhotsk extending from the cleft between the two
islands. 
The thick snow band formed as the prevailing relatively-warm
northwesterly was uplifted along the convergence zone.  Sensitivity
simulations revealed that topographical effects are rather minimal 
with the comparison of land sea temperature differences. It has been
found that low level wind flow across the coast due to the land sea 
temperature contrast has been responsible for the formation of the 
cloud band.

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