摘要
利用CMIP5的17个全球气候系统模式对500 hPa位势高度场的年代际回报结果,采用距平相关系数、均方根误差、平均绝对误差及连续等级概率评分4种指标,评估了贝叶斯模式平均(Bayesian model average,BMA)预报方法对东亚夏季环流的回报能力,并与最优单模式MIROC5和多模式简单集合平均结果进行了比较。结果表明,BMA方法对东亚夏季500 hPa位势高度场的回报效果是最好的,优于最优单模式MIROC5和简单集合平均的回报结果。BMA模型能产生高集中度的概率密度函数,并包含了多模式集成回报不确定性的定量估计。此外,BMA方法对西太平洋副热带高压的年际变率也有较好的回报效果,对西太平洋副热带高压的预报,选取60~70%概率下的结果更为合理。
By using the deeadal hindcast of the 500 hPa geopotential height field with 17 climatic system models of CMIPS, the capabilities of Bayesian Model Average (BMA) method to hindcast summer circulation over East Asia were evaluated employing assessment indexes as Anomaly Correlation Coeffi- cient (ACC), Root Mean Square Error (RMSE), Mean Absolute Error (MAE) and Continuous Ranked Probability Score (CRPS), and compared with the optimal single model MIROC5 and Multi-model En- semble Mean (EMN). Results show that the hindcast skill of BMA for 500 hPa geopotential height is bet- ter than that of MIROC5 and EMN. BMA yields probability density function (PDF) that are calibrated and provides quantitative estimates of the uncertainty. This is also ture for the case of inter-annual varia-bility of Subtropical High over West Pacific (WPSH), whose precipitation is more reasonable under 60- 70% probability.
出处
《气象科学》
北大核心
2016年第3期340-348,共9页
Journal of the Meteorological Sciences
基金
国家重大科学研究计划项目(2012CB955200)
江苏高校优势学科建设工程资助项目(PAPD)
江苏省"青蓝工程"(东亚季风与区域气候变化)