Ensemble Kalman filter updates based on regularized sparse inverse Cholesky factors
Ensemble Kalman filter updates based on regularized sparse inverse Cholesky factors
复制标题
基于正则化稀疏逆 Cholesky 因子的集成卡尔曼滤波器更新
DOI:
10.1175/mwr-d-20-0299.1
复制
发表时间:
2021
影响因子:
3.2
通讯作者:
Katzfuss, Matthias
中科院分区:
文献类型:
--
作者:
Boyles, Will;Katzfuss, Matthias
The ensemble Kalman filter (EnKF) is a popular technique for data assimilation in high-dimensional nonlinear state-space models. The EnKF represents distributions of interest by an ensemble, which is a form of dimension reduction that enables straightforward forecasting even for complicated and expensive evolution operators. However, the EnKF update step involves estimation of the forecast covariance matrix based on the (often small) ensemble, which requires regularization. Many existing regularization techniques rely on spatial localization, which may ignore long-range dependence. Instead, our proposed approach assumes a sparse Cholesky factor of the inverse covariance matrix, and the nonzero Cholesky entries are further regularized. The resulting method is highly flexible and computationally scalable. In our numerical experiments, our approach was more accurate and less sensitive to misspecification of tuning parameters than tapering-based localization.
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影响因子:
4.4
作者:
Kidd, Brian;Katzfuss, Matthias
通讯作者:
Katzfuss, Matthias
影响因子:
2.2
作者:
Jurek, Marcin;Katzfuss, Matthias
通讯作者:
Katzfuss, Matthias
DOI:
10.1080/01621459.2019.1592753
发表时间:
2017-04
影响因子:
3.7
作者:
M. Katzfuss;Jonathan R. Stroud;C. Wikle
通讯作者:
M. Katzfuss;Jonathan R. Stroud;C. Wikle
影响因子:
5.7
作者:
Katzfuss, Matthias;Guinness, Joseph
通讯作者:
Guinness, Joseph