The impact of radar radial velocity data assimilation using variational and EnKF systems on the forecast of Super Typhoon Hato (2017) with Rapid Intensification

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Dongmei Xu , Jiajun Chen , Hong Li , Feifei Shen , Zhixin He
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引用次数: 0

Abstract

The prediction of the Rapid Intensification (RI) of Tropical Cyclones (TCs) is challenging in the nearshore areas of the northern South China Sea. In this study, we investigated the impact of radar Radial Velocity (RV) Data Assimilation (DA) on the initiation, development, and forecasts of the severe Typhoon Hato (2017), which is featured with rapid movement and intensifications. The investigation was based on rapid update cycling schemes based on variational and Ensemble Kalman Filter (EnKF) analyses by assimilating radar RV and conventional observations. Two EnKF DA experiments are designed to compare the horizontal localization scheme. It is found that, compared to the variational DA experiment, the two EnKF DA experiments tend to improve the dynamic and thermodynamic information of typhoon in the background more effectively, with the background error covariance estimated by the ensemble sampling. It seems the EnKF analyses based on the Successive Covariance Localization (SCL) method is able to more effectively adjust multiple scales even when the inner core of Hato is not completely covered by the RV observations.
使用变分和 EnKF 系统的雷达径向速度数据同化对快速加强型超强台风 "哈托"(2017 年)预报的影响
热带气旋(TC)的快速加强(RI)预测在南海北部近岸地区具有挑战性。在本研究中,我们研究了雷达径向速度(RV)数据同化(DA)对具有快速移动和增强特征的强台风 "哈托"(2017 年)的起始、发展和预报的影响。研究基于变异和集合卡尔曼滤波器(EnKF)分析的快速更新循环方案,通过同化雷达 RV 和常规观测数据进行。为比较水平定位方案,设计了两个 EnKF DA 实验。结果发现,与变异DA实验相比,两个EnKF DA实验倾向于更有效地改进台风背景的动态和热动力信息,背景误差协方差由集合采样估计。基于连续协方差定位(SCL)方法的EnKF分析似乎能够更有效地调整多个尺度,即使在RV观测数据没有完全覆盖 "哈托 "内核的情况下。
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来源期刊
Atmospheric Research
Atmospheric Research 地学-气象与大气科学
CiteScore
9.40
自引率
10.90%
发文量
460
审稿时长
47 days
期刊介绍: The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.
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