Systematic evaluation of the impacts of GPSRO data on the prediction of typhoons over the northwestern Pacific in 2008-2010

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Title:	Systematic evaluation of the impacts of GPSRO data on the prediction of typhoons over the northwestern Pacific in 2008-2010
Authors:	黃清勇;Chen, Y.-C.;Hsieh, M.-E.;Hsiao, L.-F.;Kuo, Y.-H.;Yang, M.-J.;Huang, C.-Y.;Lee, C.-S.
Contributors:	地球科學學院大氣科學學系
Keywords:	Analysis;Cold;Data;Data assimilation;Data collection;Data processing;Errors;Evaluation;Forecast errors;Global Positioning System;Global positioning systems;GPS;Humidity;Hurricanes;Measurement techniques;Meteorological research;Meteorological satellites;Positioning systems;Predictions;Radio occultation;Refractive index;Refractivity;Soundings;Statistical analysis;Typhoons;Water temperature;Water vapor;Water vapour;Weather;Weather forecasting;Wind;Wind fields
Date:	2015-06-23
Issue Date:	2026-04-21 14:05:47 (UTC+8)
Publisher:	Copernicus Gesellschaft mbH;Katlenburg-Lindau: Copernicus Publications
Abstract:	摘要： In this paper, we perform a systematic evaluation of the impact of Global Positioning System radio occultation (GPSRO) data on typhoon-track prediction over the northwestern Pacific. Specifically, we perform data assimilation and forecast experiments using the Typhoon Weather Research and Forecasting (TWRF) system at 45 km resolution on 11 typhoons (with a total of 327 cases) in the period of 2008–2010 over the northwestern Pacific, with or without the use of GPSRO refractivity observations. On average, about 100 GPSRO soundings are assimilated over a 12 h partially cycling assimilation period. The results indicate that the assimilation of GPSRO data reduces the 72 h track forecast errors by approximately 12 km (5 %). Although this is only a modest improvement, it is statistically significant. The assimilation of GPSRO data improves the analysis and the forecast of temperature, water vapor, and wind fields. Further analysis shows that the reduction in typhoon-track forecast errors can be attributed to the improved prediction of western Pacific subtropical high (WPSH) and its associated circulation, which leads to better forecasting of the environmental steering flow. 出版者： Katlenburg-Lindau: Copernicus Publications 出版日期： 2015-06-23 出處： Atmospheric measurement techniques, 2015-06, Vol.8 (6), p.2531-2542 資源來源： Publicly Available Content Database (Proquest) 版權： COPYRIGHT 2015 Copernicus GmbH 版權： Copyright Copernicus GmbH 2015 版權： 2015. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1867-8548 識別號： ISSN: 1867-1381 識別號： EISSN: 1867-8548 識別號： DOI: 10.5194/amt-8-2531-2015
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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