Seamless Stratocumulus Simulation across the Turbulent Gray Zone

被引：194

作者：

Boutle, I. A. ^{[1
]}

Eyre, J. E. J. ^{[1
]}

Lock, A. P. ^{[1
]}

机构：

[1] Met Off, Exeter EX1 3PB, Devon, England

来源：

MONTHLY WEATHER REVIEW | 2014年 / 142卷 / 04期

基金：

英国自然环境研究理事会;

关键词：

Boundary layer; Cloud parameterizations; Large eddy simulations; Numerical weather prediction; forecasting; Parameterization; Subgrid-scale processes; PART I; SCHEME; CLOUD; MODEL; REPRESENTATION; FLUXES;

D O I：

10.1175/MWR-D-13-00229.1

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

A pragmatic approach for representing partially resolved turbulence in numerical weather prediction models is introduced and tested. The method blends a conventional boundary layer parameterization, suitable for large grid lengths, with a subgrid turbulence scheme suitable for large-eddy simulation. The key parameter for blending the schemes is the ratio of grid length to boundary layer depth. The new parameterization is combined with a scale-aware microphysical parameterization and tested on a case study forecast of stratocumulus evolution. Simulations at a range of model grid lengths between 1 km and 100 m are compared to aircraft observations. The improved microphysical representation removes the correlation between precipitation rate and model grid length, while the new turbulence parameterization improves the transition from unresolved to resolved turbulence as grid length is reduced.

引用

页码：1655 / 1668

页数：14

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