Impact of Megha-Tropiques SAPHIR radiance assimilation on the simulation of tropical cyclones over Bay of Bengal

D. M, D. Gopalakrishnan, A. Chandrasekar, S. K. Singh, V. S. Prasad
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Abstract

Impact of SAPHIR radiance assimilation on the simulation of tropical cyclones over Indian region has been investigated using the Weather Research and Forecasting (WRF) model. Three cyclones that formed over Bay of Bengal have been considered in the present study. Assimilation methodology used here is the three dimensional variational (3DVar) scheme within the WRF model. With the initial and boundary conditions from Global Forecasting System (GFS) analyses from the National Centres for Environmental Prediction (NCEP), a control run (CTRL) without assimilation of any data and a 3DVar run with the assimilation of SAPHIR radiance have been performed. Both model simulations have been compared with the observations from India Meteorological Department (IMD), Tropical Rainfall Measurement Mission (TRMM), and analysis fields from GFS. Detailed analysis reveals that, the SAPHIR radiance assimilation has led to significant improvement in the simulation of all the three cyclones in terms of cyclone track, intensity, accumulated rainfall. The simulation of warm core structure and relative vorticity profile of each cyclone by 3DVar run are found to be more closer to GFS analyses, when compared with the CTRL run.
大热带SAPHIR辐射同化对孟加拉湾热带气旋模拟的影响
利用天气研究与预报(WRF)模式研究了sapir辐射同化对印度地区热带气旋模拟的影响。本研究考虑了孟加拉湾上空形成的三个气旋。这里使用的同化方法是WRF模式中的三维变分(3DVar)方案。利用国家环境预测中心(NCEP)全球预报系统(GFS)分析的初始条件和边界条件,进行了不同化任何数据的控制运行(CTRL)和同化sapir辐射的3DVar运行。将两种模式的模拟结果与印度气象局(IMD)、热带降雨测量任务(TRMM)和GFS分析场的观测结果进行了比较。详细分析表明,sapir辐射同化对三个气旋的模拟在气旋路径、强度、累积雨量等方面都有显著改善。与CTRL运行相比,3DVar运行对各气旋暖核结构和相对涡度廓线的模拟更接近GFS分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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