Development of an Effective Non-Linear Normal-Mode Initialization Method for a High-Resolution Global Model

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概要

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• An efficient non-linear normal-mode initialization (NNMI) scheme for a super high-resolution atmospheric general circulation model (AGCM) has been developed. The conventional NNMI method, based on Machenhauer (1977), is difficult to apply to such an AGCM, with a grid spacing of 20 km, since it demands an extremely large computational memory. The new scheme combines two techniques; one is the vertical-mode initialization method proposed by Bourke and McGregor (1983), and the other is the incremental NNMI method proposed by Ballish et al. (1992). Comparisons with the conventional Machenhauer scheme, using a 60 km-resolution AGCM, show that the new scheme favorably suppresses undesirable gravity-wave oscillations, while maintaining meaningful tidal waves in the initial states. A medium-range forecast experiment with data assimilation shows that the new scheme is also competitive with the conventional scheme in terms of forecast skill. It is demonstrated that the new scheme is efficient and effective for a 20 km-resolution AGCM.

• 社団法人日本気象学会の論文
• 2007-04-25

著者

• MURAKAMI Hiroyuki

  Advanced Earth Science and Technology Organization (AESTO), Japan Meteorological Agency

• MATSUMURA Takayuki

  Numerical Prediction Division, Japan Meteorological Agency

• Murakami Hiroyuki

  Advanced Earth Science And Technology Organization (aesto) Japan Meteorological Agency

• Matsumura Takayuki

  Numerical Prediction Division Japan Meteorological Agency

関連論文

• Verification of Typhoon Forecasts for a 20km-mesh High-Resolution Global Model
• Development of an Effective Non-Linear Normal-Mode Initialization Method for a High-Resolution Global Model

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