Assimilation of FORMOSAT-3/COSMIC electron density profiles into a coupled thermosphere/ionosphere model using ensemble Kalman filtering

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題名:	Assimilation of FORMOSAT-3/COSMIC electron density profiles into a coupled thermosphere/ionosphere model using ensemble Kalman filtering
作者:	劉正彥;Lee, I. T.;Matsuo, T.;Richmond, A. D.;Liu, J. Y.;Wang, W.;Lin, C. H.;Anderson, J. L.;Chen, M. Q.
貢獻者:	地球科學學院太空科學與工程學系
關鍵詞:	Atmospheric research;Atmospheric sciences;data assimilation;Data collection;Earth sciences;Earth, ocean, space;ensemble Kalman filter;Exact sciences and technology;FORMOSAT-3/COSMIC;Global positioning systems;GPS;Hydrodynamics;Ionosphere;Physics;Quality control;Radio
日期:	2012-01-01
上傳時間:	2026-04-23 11:03:18 (UTC+8)
出版者:	Wiley-Blackwell;Washington, DC: Blackwell Publishing Ltd
摘要:	摘要： This paper presents our effort to assimilate FORMOSAT‐3/COSMIC (F3/C) GPS Occultation Experiment (GOX) observations into the National Center for Atmospheric Research (NCAR) Thermosphere Ionosphere Electrodynamics General Circulation Model (TIE‐GCM) by means of ensemble Kalman filtering (EnKF). The F3/C electron density profiles (EDPs) uniformly distributed around the globe which provide an excellent opportunity to monitor the ionospheric electron density structure. The NCAR TIE‐GCM simulates the Earth's thermosphere and ionosphere by using self‐consistent solutions for the coupled nonlinear equations of hydrodynamics, neutral and ion chemistry, and electrodynamics. The F3/C EDP are combined with the TIE‐GCM simulations by EnKF algorithms implemented in the NCAR Data Assimilation Research Testbed (DART) open‐source community facility to compute the expected value of electron density, which is ‘the best’ estimate of the current ionospheric state. Assimilation analyses obtained with real F3/C electron density profiles are compared with independent ground‐based observations as well as the F3/C profiles themselves. The comparison shows the improvement of the primary ionospheric parameters, such as NmF2 and hmF2. Nevertheless, some unrealistic signatures appearing in the results and high rejection rates of observations due to the applied outlier threshold and quality control are found in the assimilation experiments. This paper further discusses the limitations of the model and the impact of ensemble member creation approaches on the assimilation results, and proposes possible methods to avoid these problems for future work. Key Points First use of EnKF to assimilate F3/C density profiles into a coupled model Posterior NmF2 and hmF2 agree better with observations than default simulations Forcing parameters would be estimated to reduce inconsistencies 其他題名： J. Geophys. Res 出版者： Washington, DC: Blackwell Publishing Ltd 出版日期： 2012-10 出處： Journal of Geophysical Research: Space Physics, 2012-10, Vol.117 (A10), p.n/a 資源來源： Wiley Online Library All Journals 版權： 2012. American Geophysical Union. All Rights Reserved. 版權： 2015 INIST-CNRS 版權： Copyright American Geophysical Union 2012 識別號： ISSN: 0148-0227 識別號： ISSN: 2169-9380 識別號： EISSN: 2156-2202 識別號： EISSN: 2169-9402 識別號： DOI: 10.1029/2012JA017700
顯示於類別:	[太空科學與工程學系] 期刊論文

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