Impact of AMSU-A and MHS radiances assimilation on Typhoon Megi (2016) forecasting

被引:2
|
作者
Liu, Chaoshun [1 ,2 ]
Gong, Junqiang [1 ,2 ,3 ]
机构
[1] East China Normal Univ, Key Lab Geog Informat Sci, Minist Educ, Shanghai 200241, Peoples R China
[2] East China Normal Univ, Sch Geog Sci, Shanghai 200241, Peoples R China
[3] Jinhua Meteorol Bur, Jinhua 321099, Zhejiang, Peoples R China
来源
OPEN GEOSCIENCES | 2023年 / 15卷 / 01期
关键词
assimilation; Weather Research and Forecasting model's three-dimensional variational data assimilation system; Typhoon Megi (2016); Advanced Microwave Sounder Unit-A; Microwave Humidity Sounder; ATMOSPHERIC-TEMPERATURE; WEATHER-PREDICTION; TROPICAL CYCLONES; CHINA; INTENSITY; SYSTEM; TRACK; INITIALIZATION; MOISTURE; COASTAL;
D O I
10.1515/geo-2022-0460
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
To better understand the assimilation contribution and influence mechanism of different satellite platforms and different microwave instruments, the radiance data of Advanced Microwave Sounding Unit-A (AMSU-A) and the Microwave Humidity Sounder (MHS) onboard NOAA-15 and NOAA-18 are assimilated to investigate various assimilation effects on the prediction of path and intensity of Typhoon Megi (2016) based on Weather Research and Forecasting (WRF) three-dimensional variation and the WRF model. The community radiative transfer model is employed as the forward operator. The quality control and bias correction procedures before the radiance data assimilation (DA) are performed to improve the simulations.Impact of AMSU-A and MHS radiances assimilation on Typhoon Megi (2016)'s path and intensity is investigated by six experiments (without and with AMSU-A and MHS DA) with initial conditions at 1200 UTC on 25 September 2016 and 60 h forecast integration.The results are compared to the observational data from the China Meteorological Administration tropical cyclone database. The impact mechanisms of DA adjustments to the initial fields and assimilation increment analysis of each physical quantity field are investigated in detail. The findings show that NOAA-15 AMSU-A assimilation produces the best output over the course of the 60 h simulation, demonstrating that assimilation satellite data from multiple platforms is not always better than assimilation satellite data from a single platform. In comparison, MHS assimilation has a favorable effect on short-term path and strength forecasts, but has a negative impact on long-term forecasts. The effect of MHS DA needs to be further investigated.
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收藏
页数:16
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