YAO Jia-lin,ZHANG Hua,LI Ze-chun,et al.Preliminary Study on Construction Method of GRAPES Model External Background Profiles[J].Journal of Chengdu University of Information Technology,2016,(06):622-628.
GRAPES模式顶外部背景廓线构造方法初步研究
- Title:
- Preliminary Study on Construction Method of GRAPES Model External Background Profiles
- 文章编号:
- 2096-1618(2016)06-0622-07
- Keywords:
- weather forecast; numerical forecast method; one dimensional variational model; top model; background profile
- 分类号:
- P456.7
- 文献标志码:
- A
- 摘要:
- 为得到与实际高层大气环流形势相近的GRAPES模式顶以上背景廓线,设计5种尽可能贴合模式顶以上实际温度误差随高度分布的模拟试验,利用一维变分方法和实际高光谱IASI资料对模式顶以上温度廓线进行订正,并利用通道权重制定4种高层通道的选择方案,结果表明:该方法可将包含各种误差的温度廓线进行调整,一般在1 hPa处调整率达最大,最大超过90%; 在0.1 hPa处调整率较低,维持在30%左右; 10 hPa处调整率较小,因为该处调整前后的温度误差都很小; 选取通道权重高于50 hPa的通道即可对模式顶以上温度廓线进行有效调整。通过改进数值预报方法,为进一步提高GRAPES模式的天气预报效果奠定了基础。
- Abstract:
- In order to get close to the actual situation of the upper atmospheric circulation model GRAPES above the top of the background profile, we design 5 simulation test mode to fit the actual temperature with height above the top of the error distribution as much as possible. By using one-dimensional variational method and real hyperspectral IASI data correction on the pattern above the top temperature profile, and by using the channel weight formulation of the 4 top channels, the results show that the temperature profile of this method will contain a variety of error adjustment. And the general adjustment rate reaches a maximum at 1 hPa, while the maximum of more than 90%; at 0.1 hPa the adjustment rate is low, which remains at around 30%; 10 hPa adjustment rate is smaller, because the temperature error before or after adjustment is very small; the selected channel weight is higher than that of the 50 hPa channel, and it can be effectively adjusted to the pattern above the top temperature profile. By improving the numerical forecast method, we can establishe the foundation to further improve the weather forecast effect of GRAPES model.
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备注/Memo
收稿日期:2016-05-05 基金项目:公益性行业(气象)科研专项资助项目(GYHY2012060 02、GYHY201106008)