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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Assessment of the Impact of FORMOSAT-7/COSMIC-2 GNSS RO Observations on Midlatitude and Low-Latitude Ionosphere Specification: Observing System Simulation Experiments Using Ensemble Square Root Filter
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Assessment of the Impact of FORMOSAT-7/COSMIC-2 GNSS RO Observations on Midlatitude and Low-Latitude Ionosphere Specification: Observing System Simulation Experiments Using Ensemble Square Root Filter

机译：评估Formosat-7 / COSMIC-2 GNSS RO观察对中际和低纬度电离层规格的影响：使用集合方根过滤器观察系统仿真实验

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摘要

The Formosa Satellite-7/Constellation Observing System for Meteorology, Ionosphere, and Climate-2 (FORMOSAT-7/COSMIC-2) Global Navigation Satellite System radio occultation (RO) payload can provide global observations of slant total electron content (sTEC) with an unprecedentedly high spatial temporal resolution. Recently, a new ionospheric data assimilation system, the Community Gridpoint Statistical Interpolation (GSI) Ionosphere, is constructed with the National Oceanic and Atmospheric Administration GSI Ensemble Square Root Filter and the Global Ionosphere Plasmasphere and the Thermosphere Ionosphere Electrodynamic General Circulation Model. The paper demonstrates the capability of the GSI Ionosphere to improve the ionospheric specification and make a quantitative assessment of the impact of FORMOSAT-7/COSMIC-2 RO data on the ionospheric observing system simulation experiments conducted to calibrate key Ensemble Square Root Filter parameters that control detrimental effects of the sampling errors, particularly on the ensemble-based estimation of the correlation between observations and model states, in order to yield high-quality assimilation analysis. Results from the observing system simulation experiments show that (1) an ensemble size larger than 70 is recommended for assimilation of RO sTEC data with the GSI Ionosphere and (2) localizing the impact of observations around the tangent points in the horizontal direction with a length scale of 5,000 km is effective in improving assimilation analysis quality. Assimilation of sTEC data from FORMOSAT-7/COSMIC-2 can considerably improve the global ionospheric specification through the application of the GSI Ionosphere. The GSI Ionosphere can provide instantaneous global pictures of the ionosphere variability and help characterize day-to-day variability of the ionosphere and deepen our understanding of the observed day-to-day variability.
机译：Formosa卫星-7 /星座的气象，电离层和气候 - 2（Formosat-7 / Cosmic-2）全局导航卫星系统无线电掩星（RO）有效载荷可以提供对倾斜全电子含量（STEC）的全局观察一种前所未有的高空间时间分辨率。最近，通过国家海洋和大气管理GSI合奏方形根过滤器和全球电离层电流电力通用循环模型构建了一种新的电离层数据同化系统，构建了全国海洋和大气施用GSI合奏和全球电离层电力通用循环模型。本文证明了GSI电离层改善电离层规范的能力，并对Formosat-7 / COSMIC-2 RO数据的影响进行定量评估，对控制的电离层观察系统模拟实验进行控制采样误差的有害影响，特别是在观察和模型状态之间的相关性估计上，以产生高质量的同化分析。观察系统仿真实验的结果表明（1）建议使用GSI电离层和（2）将RO STEC数据和（2）分化在水平方向上的切线周围的影响的影响，以使RO STEC数据同化的组合尺寸5,000公里的规模对于改善同化分析质量有效。来自Formosat-7 / COSMIC-2的STEC数据的同化通过应用GSI电离层可以大大改善全局电离层规范。 GSI电离层可以提供电离层变异性的瞬时全球图片，并有助于表征电离层的日常变异性，深化我们对观察到的日常变异性的理解。

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    C. -T. Hsu; T. Matsuo; X. Yue; T. -W. Fang; T. Fuller-Rowell; K. Ide; J. -Y. Liu;

  • 作者单位

    Institute of Space Science National Central University Taoyuan Taiwan;

    Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA;

    Institude of Geology and Geophysics Chinese Academy of Sciences Beijing China;

    Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA;

    Institude of Geology and Geophysics Chinese Academy of Sciences Beijing China;

    Department of Atmospheric and Oceanic Science University of Maryland College Park MD USA;

    Institute of Space Science National Central University Taoyuan Taiwan;

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  • 正文语种 eng
  • 中图分类 空间物理;
  • 关键词

    Assessment; Impact of FORMOSAT-7/COSMIC-2; Root Filter;

    机译：评估;Formosat-7 / Cosmic-2的影响;根过滤器;

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