Differences between the Intense Precipitation Associated with Subsynoptic-Scale Baiu Frontal Depression Simulated by an AGCM and Described in Observational Studies
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概要
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We compared features of the precipitation associated with subsynoptic-scale Baiu frontal depression simulated by an atmospheric general circulation model (AGCM; T106L56: a spectral primitive-equationmodel with 56σ levels and triangular spectral truncation at zonal wavenumber 106) with the features had been described in observational studies. The 21-year model integration from 1979 to 1999 was constrained by observed sea-surface temperature and sea-ice distribution. As typical examples, this paper examines simulation cases for June 1991. Comparisons with past observational results showed that the AGCM properly simulated the Baiu front and the Baiu frontal precipitation in the averaged fields for a 15-day period in June 1991. However, the area of the largest 1-hour precipitation is simulated at about 500km northeastward from the area of the largest averaged precipitation. We also found significant differences between the simulations and the observations when we examined the daily precipitation and the maximum 1-hour precipitation for each day simulated by the model. While precipitation associated with subsynoptic-scale Baiu frontal depressions was relatively well simulated, intense precipitation in the trailing portion of these depressions was significantly underestimated. The result of the present study indicates that the ability of the AGCM to reproduce such extreme precipitation events must be examined in detail by comparing simulated daily and hourly precipitation with observational studies as well as by statistical analyses.
- 社団法人日本気象学会の論文
- 2008-08-25
著者
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Ninomiya Kozo
Frontier Research Center For Global Change Japan Agency For Marine-earth Science And Technology
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NISHIMURA Teruyuki
Frontier Research Center for Global Change, Japan Agency for Marie-Earth Science and Technology
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Suzuki Tsuneaki
Frontier Research Center For Global Change Japan Agency For Marine-earth Science And Technology
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Nishimura Teruyuki
Frontier Research Center For Global Change Japan Agency For Marine-earth Science And Technology
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Nishimura Teruyuki
Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology
関連論文
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- Multi-scale Interaction Processes Associated with Development of a Sub-Synoptic-Scale Depression on the Meiyu-Baiu Frontal Zone
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- Features of the Polar Air Outbreak and the Energy Balance in the Transformed Air-Mass Observed over the Japan Sea
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- Differences between the Intense Precipitation Associated with Subsynoptic-Scale Baiu Frontal Depression Simulated by an AGCM and Described in Observational Studies
- The North Pacific Subtropical High Characterized Separately for June, July, and August : Zonal Displacement Associated with Submonthly Variability