Improvement of wind field forecasts for tropical cyclones over the North Indian Ocean

IF 2.4 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
S.D. Kotal, S.K. Bhattacharya
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引用次数: 5

Abstract

This paper demonstrates a modification method for real-time improvement of wind field forecasts for a typical cyclone VARDAH, which formed over the Bay of Bengal (BoB) in 2016. The proposed method to improve the wind field forecasts associated with tropical cyclone consists of two components. The first one is the relocation method, which relocates the wind field forecasts obtained from the Global Forecast System(GFS) data of National Centres for Environmental Prediction(NCEP). The relocation of the model forecasts wind field is made on forecast locations generated by Multi Model Ensemble (MME) track forecast of India Meteorological Department(IMD). The second one is the modification of wind speed, which directly modifies the NCEP GFS wind speed forecasts based on intensity forecasts by Statistical Cyclone Intensity Prediction(SCIP) model of IMD. Applying these two methods, the displacement of wind field and underestimation/overestimation of wind speed in the model forecast field can be improved. Both modification methods show considerable improvements in the displacement and speed of wind field forecasts. The displacement error of wind field is found to have improved by about 51% at 48 h and about 80% at 72 h forecast. Overestimation of maximum wind speed in the forecast field is found to be improved by about 88% at 48 h and about 38% at 72 h forecast. The spatial distributions of corrected wind speed forecasts are also found to be more analogous than direct model forecasts with the corresponding analysis wind at all forecast hours. Two proposed modification methods could provide improved wind field forecast associated with tropical cyclones in real-time.

改进北印度洋热带气旋的风场预报
本文介绍了2016年在孟加拉湾形成的典型气旋VARDAH风场预报实时改进的修正方法。提出的改进热带气旋风场预报的方法包括两个部分。第一种是重新定位法,将国家环境预报中心(NCEP)全球预报系统(GFS)的风场预报数据进行重新定位。根据印度气象局(IMD)的多模式集合(MME)路径预报所产生的预报位置,对模式预报风场进行了重新定位。二是对风速的修正,即在IMD统计气旋强度预报(SCIP)模式预报强度的基础上,直接修正NCEP GFS的风速预报。应用这两种方法可以改善模式预报场中风场的位移和风速的过低/过高估计。两种修正方法在风场位移和风速预报方面都有较大的改进。结果表明,在48 h预报时,风场位移误差提高了约51%,在72 h预报时,风场位移误差提高了约80%。在48 h和72 h预报时,预报场对最大风速的高估分别提高了约88%和约38%。校正后的风速预报在各预报时段的空间分布也比直接模式预报更接近于相应的分析风。提出的两种修正方法可提供更准确的热带气旋风场实时预报。
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来源期刊
Tropical Cyclone Research and Review
Tropical Cyclone Research and Review METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.60
自引率
3.40%
发文量
184
审稿时长
30 weeks
期刊介绍: Tropical Cyclone Research and Review is an international journal focusing on tropical cyclone monitoring, forecasting, and research as well as associated hydrological effects and disaster risk reduction. This journal is edited and published by the ESCAP/WMO Typhoon Committee (TC) and the Shanghai Typhoon Institute of the China Meteorology Administration (STI/CMA). Contributions from all tropical cyclone basins are welcome. Scope of the journal includes: • Reviews of tropical cyclones exhibiting unusual characteristics or behavior or resulting in disastrous impacts on Typhoon Committee Members and other regional WMO bodies • Advances in applied and basic tropical cyclone research or technology to improve tropical cyclone forecasts and warnings • Basic theoretical studies of tropical cyclones • Event reports, compelling images, and topic review reports of tropical cyclones • Impacts, risk assessments, and risk management techniques related to tropical cyclones
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