Evaluation of energy fluxes in the NCEP climate forecast system version 2.0 (CFSv2)

被引:6
|
作者
Rai, Archana [1 ]
Saha, Subodh Kumar [1 ]
机构
[1] Indian Inst Trop Meteorol, Dr Homi Bhabha Rd, Pune 411008, Maharashtra, India
关键词
SURFACE RADIATION BUDGET; ATMOSPHERE RADIATION; SUMMER MONSOON; MODEL; REANALYSIS; CONSISTENT; AMERICA; BALANCE; CLOUDS; IMPACT;
D O I
10.1007/s00382-017-3587-z
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The energy fluxes at the surface and top of the atmosphere (TOA) from a long free run by the NCEP climate forecast system version 2.0 (CFSv2) are validated against several observation and reanalysis datasets. This study focuses on the annual mean energy fluxes and tries to link it with the systematic cold biases in the 2 m air temperature, particularly over the land regions. The imbalance in the long term mean global averaged energy fluxes are also evaluated. The global averaged imbalance at the surface and at the TOA is found to be 0.37 and 6.43 Wm(-2), respectively. It is shown that CFSv2 overestimates the land surface albedo, particularly over the snow region, which in turn contributes to the cold biases in 2 m air temperature. On the other hand, surface albedo is highly underestimated over the coastal region around Antarctica and that may have contributed to the warm bias over that oceanic region. This study highlights the need for improvements in the parameterization of snow/sea-ice albedo scheme for a realistic simulation of surface temperature and that may have implications on the global energy imbalance in the model.
引用
收藏
页码:101 / 114
页数:14
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