• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >A Case Study of the Effect of the Observation Time in 3D-Var on Near-Surface Wind Forecasts in a Limited Region
【24h】

A Case Study of the Effect of the Observation Time in 3D-Var on Near-Surface Wind Forecasts in a Limited Region

机译：3D-VAR观察时间对有限区域近地风预报的观察时间效果的案例研究

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The relationships between the prediction of near-surface winds and the corresponding time of observations in eastern China were explored using the Advanced Weather Research and Forecasting (WRF) model and the three-dimensional variational (3D-Var) scheme in the gridpoint statistical interpolation (GSI) system. A series of one-month experiments was conducted in January 2018 with different time window configurations from 0.01 to 3.0 h. The relationship between the wind observation time and the model forecast was non-linear. An observational time closer to the initial time in the model usually have greater impact on the prediction of near-surface wind speeds. Observations in the 0.4-0.8 h time window associated with abnormally high with large near-surface wind speeds provide a negative impact. The predictions improved at a much smaller rate when the time window was increased from 0.8 to 3.0 h. No significant difference was seen as the time window increased in wind direction predictions, even with large wind increments. The optimum configuration of the time window in the GSI 3D-Var system for predicting near-surface winds should therefore be 0.2 or 0.4 h. A better understanding of the relationships between the observations and the predictions will help select more effective observations when using the 3D-Var scheme.
机译：利用GRIDPOINT统计插值中的先进天气研究和预测（WRF）模型和三维变分（3D-VAR）方案探索了近地表风的预测与中国东部地区的相应观察的关系之间的关系GSI）系统。 2018年1月进行了一系列一个月的实验，不同的时间窗口配置从0.01到3.0小时。风观察时间和模型预测之间的关系是非线性的。较近模型中初始时间的观测时间通常对近表面风速的预测产生更大的影响。在0.4-0.8小时内窗口的观察与大近表面风速异常高的时间窗口提供负面影响。当时间窗口从0.8增加到3.0小时时，预测以更小的速率提高了更小的速率。随着时间窗口在风向预测中增加的时间窗口，即使具有大风量增量，也没有显着差异。因此，用于预测近表面风的GSI 3D-VAR系统中的时间窗的最佳配置应为0.2或0.4小时。更好地了解观察和预测之间的关系，将有助于在使用3D-VAR方案时选择更有效的观察。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号