Impacts of the ice-particle size distribution shape parameter on climate simulations with the Community Atmosphere Model Version 6 (CAM6)
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Published:2022-10-21
Issue:20
Volume:15
Page:7751-7766
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Zhang Wentao, Shi XiangjunORCID, Lu Chunsong
Abstract
Abstract. The impacts of the ice-crystal size distribution shape
parameter (μi) were considered in the two-moment bulk cloud
microphysics scheme of the Community Atmosphere Model Version 6 (CAM6). The
μi's impact on the statistical mean radii of ice crystals can be
analyzed based on their calculating formulas. Under the same mass
(qi) and number (Ni), the ratios of the mass-weighted radius
(Rqi, not related to μi) to other statistical mean radii
(e.g., effective radiative radius) are completely determined by μi. Offline tests show that μi has a significant impact on
the cloud microphysical processes owing to the μi-induced changes
in ice-crystal size distribution and statistical mean radii (excluding
Rqi). Climate simulations show that increasing μi would lead
to higher qi and lower Ni in most regions, and these impacts can be
explained by the changes in cloud microphysical processes. After increasing
μi from 0 to 5, the longwave cloud radiative effect increases
(stronger warming effect) by 5.58 W m−2 (25.11 %), and the
convective precipitation rate decreases by −0.12 mm d−1 (7.64 %). In short, the impacts of μi on climate simulations are
significant, and the main influence mechanisms are also clear. This suggests
that the μi-related processes deserve to be parameterized in a
more realistic manner.
Funder
National Key Research and Development Program of China National Natural Science Foundation of China
Publisher
Copernicus GmbH
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