Special Edition on Tropical Cyclones in 2015-2016 : Air-Sea Coupled Data Assimilation Experiment for Typhoons Kilo, Etau and the September 2015 Kanto-Tohoku Heavy Rainfall with the Advanced Microwave Scanning Radiometer 2 Sea Surface Temperature
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- WADA Akiyoshi
- Typhoon Research Department, Meteorological Research Institute, Tsukuba, Japan
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- TSUGUTI Hiroshige
- Forecast Research Department, Meteorological Research Institute, Tsukuba, Japan
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- OKAMOTO Kozo
- Typhoon Research Department, Meteorological Research Institute, Tsukuba, Japan
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- SEINO Naoko
- Forecast Research Department, Meteorological Research Institute, Tsukuba, Japan
書誌事項
- タイトル別名
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- Air-Sea Coupled Data Assimilation Experiment for Typhoons Kilo, Etau and the September 2015 Kanto-Tohoku Heavy Rainfall with the Advanced Microwave Scanning Radiometer 2 Sea Surface Temperature
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<p> The September 2015 Kanto-Tohoku heavy rainfall event occurred in a stationary linear convective system between Typhoons Kilo and Etau. We investigated the influence of sea surface temperature (SST) on the local heavy rainfall event using a regional air-sea strongly coupled data assimilation system based on the local ensemble transform Kalman filter (LETKF) and a nonhydrostatic atmosphere model (NHM) coupled with an ocean-surface wave model and a multilayer ocean model with an Advanced Microwave Scanning Radiometer 2 (AMSR2) level 2 (L2) SST product. From the validation of SST analyzed by the coupled data assimilation system with the Japanese geostationary multi-functional transport satellite 2 hourly SST product and in-situ observations at a moored buoy, we demonstrated that the coupled system with the AMSR2 L2 SST led to an improvement in the SST analysis. Based on the verification using radiosonde observations and radar-rain gauge rainfall analysis, the analysis of the lower-atmospheric components was improved by the air-sea coupled NHM-LETKF.</p><p> The local torrential rainfall event that occurred around 37°N in the Tochigi prefecture was embedded in a stationary linear convective system. The location of the linear convective system corresponded to the synoptic-scale convergence area between the cyclonic circulation associated with Etau and easterly lower-tropospheric winds. Strong southerly winds associated with Etau caused a periodic enhancement of local convection along the convergence area on the upwind side of the linear convective system and resulted in a wave-like train of the total water content around an altitude of 4-8 km on the leeward side. The improvement of SST analysis could not only change the transition of Etau to the extratropical cyclone but also the lower-tropospheric wind field and thereby the location of the stationary linear convective system with embedded local torrential rain.</p>
収録刊行物
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- 気象集誌. 第2輯
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気象集誌. 第2輯 97 (3), 553-575, 2019
公益社団法人 日本気象学会
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詳細情報
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- CRID
- 1390564238098706560
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- NII論文ID
- 130007659681
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- NII書誌ID
- AA00702524
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- ISSN
- 21869057
- 00261165
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- NDL書誌ID
- 029756895
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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