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| Titel |
Cloud-resolving simulation of heavy snowfalls in Japan for late December 2005: application of ocean data assimilation to a snow disaster |
| VerfasserIn |
M. Yamamoto, T. Ohigashi, K. Tsuboki, N. Hirose |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 9 ; Nr. 11, no. 9 (2011-09-26), S.2555-2565 |
| Datensatznummer |
250009678
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| Publikation (Nr.) |
 copernicus.org/nhess-11-2555-2011.pdf |
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| Zusammenfassung |
| We applied eddy-resolving ocean data assimilation to a cloud-resolving
atmospheric simulation of a snow disaster and investigated the effects of
mesoscale eddies on a heavy snowfall event in late December 2005. Ocean
circulation model (OCM) data assimilation reproduces mesoscale sea surface
temperature (SST) structures, which are smoothed out by optimum
interpolation. This difference between OCM-assimilation and
optimum-interpolation SSTs affects the atmospheric boundary layers over
oceanic mesoscale eddies. The atmospheric response to the SST difference is
complex at the cold tongue in the central Sea of Japan. Although the
horizontal wind and turbulent mixing are quickly and locally affected by the
low SST, the atmospheric temperature and water amounts are greatly affected
by the upstream high SST via the northwesterly advection. In the heavy
snowfall areas, the OCM assimilation greatly affects 10-day accumulated
precipitation, though it does not largely influence 10-day mean vertical
structures of wind, temperature and water vapor. Thus, we should recognize
the significance of oceanic mesoscale eddies for heavy snowfall. |
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