Cloud radiative forcing in Asian monsoon region simulated by IPCC AR4 AMIP models |
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| Authors: | Jiandong Li Yimin Liu Guoxiong Wu |
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| Institution: | State Key Laboratory of Atmospheric Science and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Science and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Science and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | This study examines cloud radiative forcing (CRF) in the Asian monsoon region (0°–50°N-60°–150°E) simulated by Intergovernmental
Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) AMIP models. During boreal winter, no model realistically reproduces
the larger long-wave cloud radiative forcing (LWCF) over the Tibet Plateau (TP) and only a couple of models reasonably capture
the larger short-wave CRF (SWCF) to the east of the TP. During boreal summer, there are larger biases for central location
and intensity of simulated CRF in active convective regions. The CRF biases are closely related to the rainfall biases in
the models. Quantitative analysis further indicates that the correlation between simulated CRF and observations are not high,
and that the biases and diversity in SWCF are larger than that in LWCF. The annual cycle of simulated CRF over East Asia (0°–50°N,
100°–145°E) is also examined. Though many models capture the basic annual cycle in tropics, strong LWCF and SWCF to the east
of the TP beginning in early spring are underestimated by most models. As a whole, GFDL-CM2.1, MPI-ECHAM5, UKMO-HadGAM1, and
MIROC3.2 (medres) perform well for CRF simulation in the Asian monsoon region, and the multi-model ensemble (MME) has improved
results over the individual simulations. It is suggested that strengthening the physical parameterizations involved over the
TP, and improving cumulus convection processes and model experiment design are crucial to CRF simulation in the Asian monsoon
region. |
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| Keywords: | cloud radiative forcing (CRF) AMIP models Asian monsoon region Tibet Plateau (TP) active convective region |
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