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Antarctic Radiosonde Observations Reduce Uncertainties and Errors in Reanalyses and Forecasts over the Southern Ocean: An Extreme Cyclone Case
Advances in Atmospheric Sciences ( IF 6.5 ) Pub Date : 2020-03-22 , DOI: 10.1007/s00376-019-8231-x
Kazutoshi Sato , Jun Inoue , Akira Yamazaki , Naohiko Hirasawa , Konosuke Sugiura , Kyohei Yamada

Cyclones with strong winds can make the Southern Ocean and the Antarctic a dangerous environment. Accurate weather forecasts are essential for safe shipping in the Southern Ocean and observational and logistical operations at Antarctic research stations. This study investigated the impact of additional radiosonde observations from Research Vessel “Shirase” over the Southern Ocean and Dome Fuji Station in Antarctica on reanalysis data and forecast experiments using an ensemble data assimilation system comprising the Atmospheric General Circulation Model for the Earth Simulator and the Local Ensemble Transform Kalman Filter Experimental Ensemble Reanalysis, version 2. A 63-member ensemble forecast experiment was conducted focusing on an unusually strong Antarctic cyclonic event. Reanalysis data with (observing system experiment) and without (control) additional radiosonde data were used as initial values. The observing system experiment correctly captured the central pressure of the cyclone, which led to the reliable prediction of the strong winds and moisture transport near the coast. Conversely, the control experiment predicted lower wind speeds because it failed to forecast the central pressure of the cyclone adequately. Differences were found in cyclone predictions of operational forecast systems with and without assimilation of radiosonde observations from Dome Fuji Station. 强风气旋可以使南大洋和南极成为危险的环境。准确的天气预报对南大洋的安全运输以及南极研究站的观测和后勤作业至关重要。本文研究了从南大洋Shirase研究船和南极圆顶富士站获取的补充无线电探空仪观测数据,对再分析数据及预报试验的影响,预报试验使用集合数据同化系统,该系统包括地球模拟器的大气环流模式以及基于局部集合变换卡尔曼滤波方法的试验集合再分析。针对一个异常强的南极气旋事件进行了63组集合预报试验,使用(观测系统试验)和不使用(控制试验)补充无线电探空仪数据的再分析数据作为初始值。观测系统试验正确获取了气旋的中心气压,因此准确预测了南极沿岸的强风和水汽输送。相反,控制试验预测的风速较低,因其未能充分预测出气旋中心气压。在业务预报系统中同化圆顶富士站的无线电探空仪观测数据与否,对气旋的预测存在差异。

中文翻译:

南极无线电探空仪观测减少了重新分析和预测南大洋的不确定性和错误:一个极端气旋案例

带有强风的气旋会使南大洋和南极成为危险的环境。准确的天气预报对于南大洋的安全航运以及南极研究站的观测和后勤业务至关重要。本研究使用集合数据同化系统(包括地球模拟器大气环流模型和局集合变换卡尔曼滤波器实验集合再分析,第 2 版。针对异常强烈的南极气旋事件进行了 63 人集合预报实验。有(观测系统实验)和没有(对照)附加无线电探空仪数据的再分析数据被用作初始值。观测系统实验正确地捕捉到了气旋的中心压力,从而对海岸附近的强风和水分输送进行了可靠的预测。相反,控制实验预测较低的风速,因为它未能充分预测气旋的中心压力。在同化和未同化 Dome Fuji Station 无线电探空仪观测的情况下,业务预报系统的气旋预测存在差异。强风气旋可以使南大洋和南极成为危险的。对南洋安全运输以及大南极环境研究的布局和后勤作业大站的布局。本文研究了从南洋船和南极圆顶富士山的研究。站获取的无线电无线电探空仪播数据,对再分析及试验预报的影响,预报使用集合同数据,系统包括地球试验数据的大气环流模式,以及基于局部集合变换卡尔曼滤波方法的试验集合再分析。针对一次异常强的南极气事件进行了63次集合云预报试验,
更新日期:2020-03-22
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