Evaluation of Grid-point Atmospheric Model of
IAP LASG Version 2 (GAMIL2)
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LI Lijuan,
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WANG Bin,
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DONG Li,
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LIU Li,
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SHEN Si,
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HU Ning,
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SUN Wenqi,
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WANG Yong,
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HUANG Wenyu,
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SHI Xiangjun,
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PU Ye,
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and YANG Guangwen
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Graphical Abstract
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Abstract
The Grid-point Atmospheric Model of IAP LASG version 2 (GAMIL2) has
been developed through upgrading the deep convection parameterization, cumulus
cloud fraction and two-moment cloud microphysical scheme, as well as changing
some of the large uncertain parameters. In this paper, its performance is
evaluated, and the results suggest that there are some significant improvements
in GAMIL2 compared to the previous version GAMIL1, for example, the components
of the energy budget at the top of atmosphere (TOA) and surface; the geographic
distribution of shortwave cloud radiative forcing (SWCF); the ratio of
stratiform versus total rainfall; the response of atmospheric circulation to
the tropical ocean; and the eastward propagation and spatiotemporal structures
of the Madden Julian Oscillation (MJO). Furthermore, the indirect aerosols
effect (IAE) is -0.94 W m-2, within the range of 0 to -2 W m-2
given by the IPCC 4th Assessment Report (2007). The influence of uncertain
parameters on the MJO and radiation fluxes is also discussed.
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