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arXiv 1201.2612stat.AP
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风矢量的Enhancement模式输出统计

Ensemble model output statistics for wind vectors

Nina Schuhen, Thordis L. Thorarinsdottir, Tilmann Gneiting

摘要:

提出了一种二维风矢量集合预报后处理的二元集合模式输出统计(EMOS)技术,其中后处理的概率预报采用二元正态概率密度函数的形式。后处理的平均值和方差的风矢量分量的线性偏差校正版本的集合平均值和集合方差,分别和风分量之间的条件相关性表示的集合平均风向的三角函数。在一个案例研究中的风矢量在北美太平洋西北部的48小时预报与华盛顿大学的中尺度Ensemble,双变量EMOS密度预报校准和尖锐,并显示出相当大的改善,原始集合和参考预报,包括集合Copula耦合。

英文摘要:

A bivariate ensemble model output statistics (EMOS) technique for the postprocessing of ensemble forecasts of two-dimensional wind vectors is proposed, where the postprocessed probabilistic forecast takes the form of a bivariate normal probability density function. The postprocessed means and variances of the wind vector components are linearly bias-corrected versions of the ensemble means and ensemble variances, respectively, and the conditional correlation between the wind components is represented by a trigonometric function of the ensemble mean wind direction. In a case study on 48-hour forecasts of wind vectors over the North American Pacific Northwest with the University of Washington Mesoscale Ensemble, the bivariate EMOS density forecasts were calibrated and sharp, and showed considerable improvement over the raw ensemble and reference forecasts, including ensemble copula coupling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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