Application of a new data operator‐splitting data assimilation technique to the 3‐D VERB diffusion code and CRRES measurements
Application of a new data operator‐splitting data assimilation technique to the 3‐D VERB diffusion code and CRRES measurements
复制标题
新的数据算子分割数据同化技术在 3D VERB 扩散码和 CRRES 测量中的应用
DOI：
10.1002/grl.50969
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发表时间：
2013
影响因子：
5.2
通讯作者：
D. Subbotin
中科院分区：
文献类型：
--
作者：
Y. Shprits;A. Kellerman;D. Kondrashov;D. Subbotin
在这项研究中，我们使用CRRES资料进行三维资料同化，并使用新发展的算符分裂方法进行三维通用电子辐射带模式(VERB)。用合成数据进行的模拟表明，本文提出的算子分裂卡尔曼滤波技术可以成功地重建辐射带的潜在动态演化。通过与常规卡尔曼滤波的比较，进一步验证了该方法的有效性。我们将这种新的方法应用于实际资料的三维同化，利用俯仰角、能量和L壳层相关的CRRES观测资料，在全球范围内重建了辐射带的动力学。L壳层时间截面的全球资料同化结果表明，近赤道镜像粒子和第一绝热不变量的高低值清楚地显示了相空间密度的径向分布的不同。在μ = 70 0 MeV/G的全球再分析截面上，相空间密度有一个明显的峰值，而在70 MeV/G的较低能量下，其分布是单调的。由于径向分布是从一次全球再分析中获得的，这些分布的差异反映了导致辐射带动能电子和相对论电子动态演化的基本物理过程的不同。
In this study we present 3‐D data assimilation using CRRES data and 3‐D Versatile Electron Radiation Belt Model (VERB) using a newly developed operator‐splitting method. Simulations with synthetic data show that the operator‐splitting Kalman filtering technique proposed in this study can successfully reconstruct the underlying dynamic evolution of the radiation belts. The method is further verified by the comparison with the conventional Kalman filter. We applied the new approach to 3‐D data assimilation of real data to globally reconstruct the dynamics of the radiation belts using pitch angle, energy, and L shell dependent CRRES observations. An L shell time cross section of the global data assimilation results for nearly equatorially mirroring particles and high and low values of the first adiabatic invariants clearly show the difference between the radial profiles of phase space density. At μ = 700 MeV/G cross section of the global reanalysis shows a clear peak in the phase space density, while at lower energy of 70 MeV/G the profiles are monotonic. Since the radial profiles are obtained from one global reanalysis, the differences in the profiles reflect the differences in the underlying physical processes responsible for the dynamic evolution of the radiation belt energetic and relativistic electrons.