气候变化领域集成服务门户(CCPortal): TOMOREF Operator for Assimilation of GNSS Tomography Wet Refractivity Fields in WRF DA System

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DOI	10.1029/2020JD032451
	TOMOREF Operator for Assimilation of GNSS Tomography Wet Refractivity Fields in WRF DA System
	Trzcina E.; Hanna N.; Kryza M.; Rohm W.
发表日期	2020
ISSN	2169897X
卷号	125 期号:17
英文摘要	Global Navigation Satellite System (GNSS) tomography is a technique that aims to obtain a 3-D field of humidity in the troposphere. It is based on observations of GNSS signal delays between satellites and ground-based receivers. The technique has been developed in recent years, showing positive results in the monitoring of severe weather events. The previous studies on assimilation into the numerical weather prediction models are based on available observation operators which are not adjusted to the GNSS tomography data. In this study, we demonstrate an observation operator TOMOREF dedicated to the assimilation of the GNSS tomography-derived 3-D fields of wet refractivity in a Weather Research and Forecasting (WRF) Data Assimilation (DA) system. The new tool has been tested based on wet refractivity fields derived during a heavy precipitation event. The results were validated using radiosonde observations, synoptic data, ERA5 reanalysis, and radar data. In the presented experiment, a positive impact of the GNSS tomography data assimilation on the forecast of relative humidity (RH) has been noticed (an improvement of root-mean-square error up to 0.5%). Moreover, the validation of the precipitation forecasts reveals the positive impact of the GNSS data assimilation within 1 hr after assimilation (the mean bias values are reduced up to 0.1 mm). Additionally, it was observed that assimilation of GNSS tomography data has a greater influence on the WRF model than the Zenith Total Delay (ZTD) observations, which proves the potential of the GNSS tomography data for weather forecasting. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	GNSS troposphere tomography; observation operator; TOMOREF; wet refractivity; WRF DA
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185802
作者单位	Institute of Geodesy and Geoinformatics, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland; Department of Geodesy and Geoinformation, TU Wien, Vienna, Austria; Department of Meteorology and Climatology, University of Wroclaw, Wroclaw, Poland
推荐引用方式 GB/T 7714	Trzcina E.,Hanna N.,Kryza M.,et al. TOMOREF Operator for Assimilation of GNSS Tomography Wet Refractivity Fields in WRF DA System[J],2020,125(17).
APA	Trzcina E.,Hanna N.,Kryza M.,&Rohm W..(2020).TOMOREF Operator for Assimilation of GNSS Tomography Wet Refractivity Fields in WRF DA System.Journal of Geophysical Research: Atmospheres,125(17).
MLA	Trzcina E.,et al."TOMOREF Operator for Assimilation of GNSS Tomography Wet Refractivity Fields in WRF DA System".Journal of Geophysical Research: Atmospheres 125.17(2020).