Regularized variational data assimilation for bias treatment using the Wasserstein metric
Regularized variational data assimilation for bias treatment using the Wasserstein metric
复制标题
使用 Wasserstein 度量进行偏差处理的正则化变分数据同化
DOI:
10.1002/qj.3794
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发表时间:
2020
影响因子:
8.9
通讯作者:
Lerman, Gilad
中科院分区:
文献类型:
--
作者:
Tamang, Sagar K.;Ebtehaj, Ardeshir;Zou, Dongmian;Lerman, Gilad
This article presents a new variational data assimilation (VDA) approach for the formal treatment of bias in both model outputs and observations. This approach relies on the Wasserstein metric, stemming from the theory of optimal mass transport, to penalize the distance between the probability histograms of the analysis state and an a priori reference dataset, which is likely to be more uncertain but less biased than both model and observations. Unlike previous bias‐aware VDA approaches, the new Wasserstein metric VDA (WM‐VDA) treats systematic biases of unknown magnitude and sign dynamically in both model and observations, through assimilation of the reference data in the probability domain, and can recover the probability histogram of the analysis state fully. The performance of WM‐VDA is compared with the classic three‐dimensional VDA (3D‐Var) scheme for first‐order linear dynamics and the chaotic Lorenz attractor. Under positive systematic biases in both model and observations, we consistently demonstrate a significant reduction in the forecast bias and unbiased root‐mean‐squared error.
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DOI:
10.1007/978-3-642-40457-3_32-1
发表时间:
2019
期刊:
Handbook of Hydrometeorological Ensemble Forecasting
影响因子:
--
作者:
G. Lannoy;P. Rosnay;R. Reichle
通讯作者:
R. Reichle
影响因子:
3.9
作者:
Yongxin Chen;T. Georgiou;A. Tannenbaum
通讯作者:
Yongxin Chen;T. Georgiou;A. Tannenbaum
DOI:
10.1007/978-3-319-67068-3_10
发表时间:
2018
期刊:
ArXiv
影响因子:
--
作者:
Yongxin Chen;T. Georgiou;A. Tannenbaum
通讯作者:
A. Tannenbaum
DOI:
10.1615/int.j.uncertaintyquantification.2019027745
发表时间:
2018
影响因子:
1.7
作者:
M. Motamed;D. Appelo
通讯作者:
D. Appelo
DOI:
10.3402/tellusa.v66.21789
发表时间:
2013
期刊:
Tellus A: Dynamic Meteorology and Oceanography
影响因子:
--
作者:
A. Ebtehaj;M. Zupanski;Gilad Lerman;E. Foufoula‐Georgiou
通讯作者:
E. Foufoula‐Georgiou