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Title: A unified parameterization of clouds and turbulence using CLUBB and subcolumns in the Community Atmosphere Model

Abstract

Most global climate models parameterize separate cloud types using separate parameterizations. This approach has several disadvantages, including obscure interactions between parameterizations and inaccurate triggering of cumulus parameterizations. Alternatively, a unified cloud parameterization uses one equation set to represent all cloud types. Such cloud types include stratiform liquid and ice cloud, shallow convective cloud, and deep convective cloud. Vital to the success of a unified parameterization is a general interface between clouds and microphysics. One such interface involves drawing Monte Carlo samples of subgrid variability of temperature, water vapor, cloud liquid, and cloud ice, and feeding the sample points into a microphysics scheme. This study evaluates a unified cloud parameterization and a Monte Carlo microphysics interface that has been implemented in the Community Atmosphere Model (CAM) version 5.3. Model computational expense is estimated, and sensitivity to the number of subcolumns is investigated. Results describing the mean climate and tropical variability from global simulations are presented. The new model shows a degradation in precipitation skill but improvements in shortwave cloud forcing, liquid water path, long-wave cloud forcing, precipitable water, and tropical wave simulation.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ORCiD logo; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1227326
Alternate Identifier(s):
OSTI ID: 1260874
Report Number(s):
PNNL-SA-110648
Journal ID: ISSN 1991-9603
Grant/Contract Number:  
SC0008668; AC06-76RLO 1830; SC0008323; AC05-76RL01830
Resource Type:
Published Article
Journal Name:
Geoscientific Model Development (Online)
Additional Journal Information:
Journal Name: Geoscientific Model Development (Online) Journal Volume: 8 Journal Issue: 12; Journal ID: ISSN 1991-9603
Publisher:
Copernicus Publications, EGU
Country of Publication:
Germany
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 97 MATHEMATICS AND COMPUTING

Citation Formats

Thayer-Calder, K., Gettelman, A., Craig, C., Goldhaber, S., Bogenschutz, P. A., Chen, C.-C., Morrison, H., Höft, J., Raut, E., Griffin, B. M., Weber, J. K., Larson, V. E., Wyant, M. C., Wang, M., Guo, Z., and Ghan, S. J. A unified parameterization of clouds and turbulence using CLUBB and subcolumns in the Community Atmosphere Model. Germany: N. p., 2015. Web. doi:10.5194/gmd-8-3801-2015.
Thayer-Calder, K., Gettelman, A., Craig, C., Goldhaber, S., Bogenschutz, P. A., Chen, C.-C., Morrison, H., Höft, J., Raut, E., Griffin, B. M., Weber, J. K., Larson, V. E., Wyant, M. C., Wang, M., Guo, Z., & Ghan, S. J. A unified parameterization of clouds and turbulence using CLUBB and subcolumns in the Community Atmosphere Model. Germany. https://doi.org/10.5194/gmd-8-3801-2015
Thayer-Calder, K., Gettelman, A., Craig, C., Goldhaber, S., Bogenschutz, P. A., Chen, C.-C., Morrison, H., Höft, J., Raut, E., Griffin, B. M., Weber, J. K., Larson, V. E., Wyant, M. C., Wang, M., Guo, Z., and Ghan, S. J. Tue . "A unified parameterization of clouds and turbulence using CLUBB and subcolumns in the Community Atmosphere Model". Germany. https://doi.org/10.5194/gmd-8-3801-2015.
@article{osti_1227326,
title = {A unified parameterization of clouds and turbulence using CLUBB and subcolumns in the Community Atmosphere Model},
author = {Thayer-Calder, K. and Gettelman, A. and Craig, C. and Goldhaber, S. and Bogenschutz, P. A. and Chen, C.-C. and Morrison, H. and Höft, J. and Raut, E. and Griffin, B. M. and Weber, J. K. and Larson, V. E. and Wyant, M. C. and Wang, M. and Guo, Z. and Ghan, S. J.},
abstractNote = {Most global climate models parameterize separate cloud types using separate parameterizations. This approach has several disadvantages, including obscure interactions between parameterizations and inaccurate triggering of cumulus parameterizations. Alternatively, a unified cloud parameterization uses one equation set to represent all cloud types. Such cloud types include stratiform liquid and ice cloud, shallow convective cloud, and deep convective cloud. Vital to the success of a unified parameterization is a general interface between clouds and microphysics. One such interface involves drawing Monte Carlo samples of subgrid variability of temperature, water vapor, cloud liquid, and cloud ice, and feeding the sample points into a microphysics scheme. This study evaluates a unified cloud parameterization and a Monte Carlo microphysics interface that has been implemented in the Community Atmosphere Model (CAM) version 5.3. Model computational expense is estimated, and sensitivity to the number of subcolumns is investigated. Results describing the mean climate and tropical variability from global simulations are presented. The new model shows a degradation in precipitation skill but improvements in shortwave cloud forcing, liquid water path, long-wave cloud forcing, precipitable water, and tropical wave simulation.},
doi = {10.5194/gmd-8-3801-2015},
journal = {Geoscientific Model Development (Online)},
number = 12,
volume = 8,
place = {Germany},
year = {Tue Dec 01 00:00:00 EST 2015},
month = {Tue Dec 01 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.5194/gmd-8-3801-2015

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Cited by: 31 works
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