The assimilation cycle experiments with every 6 h in two months of the GRAPES global 3DVar analysis based on pressure level and prediction system were carried out and diagnosed by using the conventional observations transferred by GTS and satellite observations. The results show that: There are 5~20 gpm negative geopotential bias above tropopause of middle and low latitude and 5~20 gpm positive geopotential bias in polar region below 100 hPa. There are bigger negative relative humidity bias in South Pole and positive relative humidity bias at the upper level. It is obvious that there is wind bias at the upper level of equator. The geopotential RMSE difference between GRAPES analysis and NCEP analysis on 500 hPa are about 10 gpm for north hemisphere and 15~24 gpm for south hemisphere. The bias and RMSE between the interpolated values of analysis and observed values have decreased. However, the geopotential height background fields have obvious negative bias in compared with observations, and there is no obvious improvement above 100 hPa. The experiments of global 3DVar analysis and prediction system indicate that the system can be run stably, although there are systemic bias for analysis and 6 h prediction fields.
ZHUANG Zhaorong
,
XUE Jishan
,
LU Huijuan
,
HAN Wei
,
LIU Yan
. Experiments of Global GRAPES-3DVar Analysis based on Pressure Level and Prediction System[J]. Plateau Meteorology, 2014
, 33(3)
: 666
-674
.
DOI: 10.7522/j.issn.1000-0534.2013.00039
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