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Title: Role of Microphysical Parameterizations with Droplet Relative Dispersion in IAP AGCM 4.1

Abstract

In previous studies we see that accurate descriptions of the cloud droplet effective radius (Re) and the autoconversion process of cloud droplets to raindrops (Au) can effectively improve simulated clouds and surface precipitation, and reduce the uncertainty of aerosol indirect effects in global climate models (GCMs). In this paper, we implement cloud microphysical schemes including two-moment Au and R e considering relative dispersion of the cloud droplet size distribution into version 4.1 of the Institute of Atmospheric Physics atmospheric GCM (IAP AGCM 4.1), which is the atmospheric component of the Chinese Academy of Sciences-Earth System model (CAS-ESM 1.0). An analysis of the effects of different schemes shows that the newly implemented schemes can improve both the simulated shortwave (SWCF) and longwave cloud radiative forcings (LWCF) as compared to the standard scheme in IAP AGCM 4.1. The new schemes also effectively enhance the large-scale precipitation, especially over low latitudes, although the influences of total precipitation are insignificant for different schemes. Further studies show that similar results can be found with the Community Atmosphere Model 5.1 (CAM5.1).

Authors:
 [1];  [2];  [3];  [4];  [5]
+ Show Author Affiliations
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Earth Environment
  2. Chinese Academy of Sciences (CAS), Beijing (China). International Center for Climate and Environment Sciences
  3. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Earth Environment; Univ. of Chinese Academy of Sciences, Beijing (China)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental and Climate Sciences Dept.
  5. Tsinghua Univ., Beijing (China). Center for Earth System Science, Joint Center for Global Change Studies (JCGCS)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1392221
Report Number(s):
BNL-114208-2017-JA
Journal ID: ISSN 0256-1530
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Advances in Atmospheric Sciences
Additional Journal Information:
Journal Volume: 35; Journal Issue: 2; Journal ID: ISSN 0256-1530
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; relative dispersion; effective radius; autoconversion process; global climate models

Citation Formats

Xie, Xiaoning, Zhang, He, Liu, Xiaodong, Liu, Yiran, and Peng, Yangang. Role of Microphysical Parameterizations with Droplet Relative Dispersion in IAP AGCM 4.1. United States: N. p., 2018. Web. doi:10.1007/s00376-017-7083-5.
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Xie, Xiaoning, Zhang, He, Liu, Xiaodong, Liu, Yiran, & Peng, Yangang. Role of Microphysical Parameterizations with Droplet Relative Dispersion in IAP AGCM 4.1. United States. doi:10.1007/s00376-017-7083-5.
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Xie, Xiaoning, Zhang, He, Liu, Xiaodong, Liu, Yiran, and Peng, Yangang. Wed . "Role of Microphysical Parameterizations with Droplet Relative Dispersion in IAP AGCM 4.1". United States. doi:10.1007/s00376-017-7083-5. https://www.osti.gov/servlets/purl/1392221.
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@article{osti_1392221,
title = {Role of Microphysical Parameterizations with Droplet Relative Dispersion in IAP AGCM 4.1},
author = {Xie, Xiaoning and Zhang, He and Liu, Xiaodong and Liu, Yiran and Peng, Yangang},
abstractNote = {In previous studies we see that accurate descriptions of the cloud droplet effective radius (Re) and the autoconversion process of cloud droplets to raindrops (Au) can effectively improve simulated clouds and surface precipitation, and reduce the uncertainty of aerosol indirect effects in global climate models (GCMs). In this paper, we implement cloud microphysical schemes including two-moment Au and Re considering relative dispersion of the cloud droplet size distribution into version 4.1 of the Institute of Atmospheric Physics atmospheric GCM (IAP AGCM 4.1), which is the atmospheric component of the Chinese Academy of Sciences-Earth System model (CAS-ESM 1.0). An analysis of the effects of different schemes shows that the newly implemented schemes can improve both the simulated shortwave (SWCF) and longwave cloud radiative forcings (LWCF) as compared to the standard scheme in IAP AGCM 4.1. The new schemes also effectively enhance the large-scale precipitation, especially over low latitudes, although the influences of total precipitation are insignificant for different schemes. Further studies show that similar results can be found with the Community Atmosphere Model 5.1 (CAM5.1).},
doi = {10.1007/s00376-017-7083-5},
journal = {Advances in Atmospheric Sciences},
issn = {0256-1530},
number = 2,
volume = 35,
place = {United States},
year = {2018},
month = {1}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI:  10.1007/s00376-017-7083-5
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Figures / Tables:

Table 1 Table 1: Annual global mean cloud microphysical properties, precipitation and aerosol optical properties from IAP AGCM 4.1 (Standard and New) and observations: the vertical integrated cloud droplet concentration (CDNUMC), liquid water path (LWP), ice water path (IWP), cloud droplet effective radius at cloud top (REL), total cloud amount (CLDTOT), lowmore » cloud fraction (CLDLOW), middle cloud fraction (CLDMID), high cloud fraction (CLDHGH), cloud optical thickness (COT), SWCF, LWCF, total precipitation rate (large-scale + convective precipitation , PRECT) and aerosol optical depth (AOD). Differences in the corresponding properties between New and Standard (New−Standard) are also shown here. Note that the values in brackets are the corresponding standard deviations of the properties.« less
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