Unified parameterization of the planetary boundary layer and shallow convection with a higher-order turbulence closure in the Community Atmosphere Model: single-column experiments

被引：62

作者：

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

Gettelman, A. ^{[1
]}

Morrison, H. ^{[1
]}

Larson, V. E. ^{[2
]}

Schanen, D. P. ^{[2
]}

Meyer, N. R. ^{[2
]}

Craig, C. ^{[1
]}

机构：

[1] Natl Ctr Atmospher Res, Boulder, CO 80307 USA

[2] Univ Wisconsin, Milwaukee, WI 53201 USA

来源：

GEOSCIENTIFIC MODEL DEVELOPMENT | 2012年 / 5卷 / 06期

基金：

美国国家科学基金会;

关键词：

PROBABILITY DENSITY-FUNCTIONS; LARGE-EDDY SIMULATIONS; PART I; CLIMATE SENSITIVITY; CUMULUS CONVECTION; STRATOCUMULUS; CLOUDS; SCALE; UNCERTAINTIES; TRANSITION;

D O I：

10.5194/gmd-5-1407-2012

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This paper describes the coupling of the Community Atmosphere Model (CAM) version 5 with a unified multi-variate probability density function (PDF) parameterization, Cloud Layers Unified by Binormals (CLUBB). CLUBB replaces the planetary boundary layer (PBL), shallow convection, and cloud macrophysics schemes in CAM5 with a higher-order turbulence closure based on an assumed PDF. Comparisons of single-column versions of CAM5 and CAM-CLUBB are provided in this paper for several boundary layer regimes. As compared to large eddy simulations (LESs), CAM-CLUBB and CAM5 simulate marine stratocumulus regimes with similar accuracy. For shallow convective regimes, CAM-CLUBB improves the representation of cloud cover and liquid water path (LWP). In addition, for shallow convection CAM-CLUBB offers better fidelity for subgrid-scale vertical velocity, which is an important input for aerosol activation. Finally, CAM-CLUBB results are more robust to changes in vertical and temporal resolution when compared to CAM5.

引用

收藏

页码：1407 / 1423

页数：17

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