https://ir.lib.ncu.edu.tw/handle/987654321/46762 推動GNSS衛星資料與新型態大氣觀測之科學應用， 透過跨領域合作，發揮新世代大氣觀測資料價值，推動卓越及創新研究。 Search the Channel s https://ir.lib.ncu.edu.tw/simple-search https://ir.lib.ncu.edu.tw/handle/987654321/109595 title: 利用福衛星系加值資料改善低對流層天氣分析與預報-利用福衛星系加值資料改善低對流層天氣分析與預報( I );Enhanced Lower-Tropospheric Weather Analysis and Forecasting with Formosat Constellation Value-Added Products( I ) abstract: 本計畫利用機器學習方式，針對低對流層掩星資料偏差進行修正，以期能提升GNSS掩星資料(如：福衛七號)之低層觀測品質，並增加資料在同化系統中的使用率，透過跨系統的技術整合，包含動態觀測誤差、天頂對流層延遲資料反演等，精進對於大氣低層水氣結構之掌握能力，並實質強化我國在 GNSS 掩星領域的資料加值與自主研發能量。 <br> Mon, 27 Jul 2026 07:26:44 GMT https://ir.lib.ncu.edu.tw/handle/987654321/109593 title: GNSS偏極化掩星資料同化算子( II );Gnss Polarimetric Radio Occultation Data Assimilation Operator ( II )( II ) abstract: 本計畫參與人員可學習資料同化技術，GNSS掩星資料相關知識，拓展及強化台灣學術有關掩星資料同化的相關技能，藉由參與本計畫之國際合作，還可了解國際上相關研究的最新發展。 另一方面，WRFDA系統已在國內許多氣象相關研究與預報作業中心等廣為使用，本研究建立的同化技術與優化等成果，未來也可提供相關單位作為參考。 <br> Mon, 27 Jul 2026 07:26:18 GMT https://ir.lib.ncu.edu.tw/handle/987654321/103199 title: Two overlooked biases of the advanced research wrf (arw) model in geopotential height and temperature abstract: 摘要： The authors have discovered two sizeable biases in the Weather Research and Forecasting (WRF) model: a negative bias in geopotential and a warm bias in temperature, appearing both in the initial condition and the forecast. The biases increase with height and thus manifest themselves at the upper part of the model domain. Both biases stem from a common root, which is that vertical structures of specific volume and potential temperature are convex functions. The geopotential bias is caused by the particular discrete hydrostatic equation used in WRF and is proportional to the square of the thickness of model layers. For the vertical levels used in this study, the bias far exceeds the gross 1-day forecast bias combining all other sources. The bias is fixed by revising the discrete hydrostatic equation. WRF interpolates potential temperature from the grids of an external dataset to the WRF grids in generating the initial condition. Associated with the Exner function, this leads to the marked bias in temperature. By interpolating temperature to the WRF grids and then computing potential temperature, the bias is removed. The bias corrections developed in this study are expected to reduce the disparity between the forecast and observations, and eventually to improve the quality of analysis and forecast in the subsequent data assimilation. The bias corrections might be especially beneficial to assimilating height-based observations (e.g., radio occultation data). 出版者： Boston, MA: American Meteorological Society 出版日期： 2012-12-01 出處： Monthly weather review, 2012-12, Vol.140 (12), p.3907-3918 資源來源： EBSCOhost OmniFile Full Text Select 版權： 2014 INIST-CNRS 版權： Copyright American Meteorological Society Dec 2012 識別號： ISSN: 0027-0644 識別號： EISSN: 1520-0493 識別號： DOI: 10.1175/MWR-D-12-00045.1 識別號： CODEN: MWREAB <br> Thu, 23 Apr 2026 03:25:25 GMT https://ir.lib.ncu.edu.tw/handle/987654321/103196 title: Traveling magnetopause distortion related to a large-scale magnetosheath plasma jet: THEMIS and ground-based observations abstract: 摘要： Here, we present a case study of THEMIS and ground‐based observations of the perturbed dayside magnetopause and the geomagnetic field in relation to the interaction of an interplanetary directional discontinuity (DD) with the magnetosphere on 16 June 2007. The interaction resulted in a large‐scale local magnetopause distortion of an “expansion – compression – expansion” (ECE) sequence that lasted for ∼15 min. The compression was caused by a very dense, cold, and fast high‐βmagnetosheath plasma flow, a so‐called plasma jet, whose kinetic energy was approximately three times higher than the energy of the incident solar wind. The plasma jet resulted in the effective penetration of magnetosheath plasma inside the magnetosphere. A strong distortion of the Chapman‐Ferraro current in the ECE sequence generated a tripolar magnetic pulse “decrease – peak– decrease” (DPD) that was observed at low and middle latitudes by some ground‐based magnetometers of the INTERMAGNET network. The characteristics of the ECE sequence and the spatial‐temporal dynamics of the DPD pulse were found to be very different from any reported patterns of DD interactions with the magnetosphere. The observed features only partially resembled structures such as FTE, hot flow anomalies, and transient density events. Thus, it is difficult to explain them in the context of existing models. Key Points A magnetosheath jet causes a strong distortion of the dayside magnetopause The jet results in intense plasma penetration inside the magnetosphere Ground magnetic variations trace the jet traveling along the magnetopause 其他題名： J. Geophys. Res 出版者： Washington, DC: Blackwell Publishing Ltd 出版日期： 2012-08 出處： Journal of Geophysical Research: Space Physics, 2012-08, Vol.117 (A8), p.n/a 資源來源： Wiley Online Library 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: 10.1029/2011JA016861 <br> Thu, 23 Apr 2026 03:25:22 GMT