Development of a novel turbulence scheme in the atmospheric boundary layer for high resolution mesoscale models

2016 Fiscal Year Final Research Report

• Project/Area Number: 26800246
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Japan, Meteorological Research Institute
• Principal Investigator: Kitamura Yuji 気象庁気象研究所, 環境・応用気象研究部, 主任研究官 (40455275)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 大気境界層 / 乱流モデリング / 解像度依存性

Outline of Final Research Achievements

It has been known that existing turbulence parameterization schemes are not applicable to high resolution mesoscale models in the atmospheric boundary layer. The dependence of turbulence length scales on the spatial resolution is estimated from an a priori analysis using high resolution Large-Eddy Simulations to solve this problem. The turbulence length scales are empirically determined as a function of the model resolution on the basis of the result obtained from this analysis, and are applied by extending the existing scheme. It is confirmed that the proposed new turbulence scheme can appropriately represent the turbulent transport even at the spatial resolution where existing schemes cannot be applied.

Free Research Field

大気科学