Variational Data Assimilation with a Learned Inverse Observation Operator
Variational Data Assimilation with a Learned Inverse Observation Operator
复制标题
使用学习逆观测算子进行变分数据同化
DOI:
--
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Stephan Hoyer
中科院分区:
文献类型:
--
作者:
Thomas Frerix;Dmitrii Kochkov;Jamie A. Smith;D. Cremers;M. Brenner;Stephan Hoyer
Variational data assimilation optimizes for an initial state of a dynamical system such that its evolution fits observational data. The physical model can subsequently be evolved into the future to make predictions. This principle is a cornerstone of large scale forecasting applications such as numerical weather prediction. As such, it is implemented in current operational systems of weather forecasting agencies across the globe. However, finding a good initial state poses a difficult optimization problem in part due to the non-invertible relationship between physical states and their corresponding observations. We learn a mapping from observational data to physical states and show how it can be used to improve optimizability. We employ this mapping in two ways: to better initialize the non-convex optimization problem, and to reformulate the objective function in better behaved physics space instead of observation space. Our experimental results for the Lorenz96 model and a two-dimensional turbulent fluid flow demonstrate that this procedure significantly improves forecast quality for chaotic systems.
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影响因子:
7.5
作者:
Kudyshev, Zhaxylyk A.;Kildishev, Alexander, V;Boltasseva, Alexandra
通讯作者:
Boltasseva, Alexandra
影响因子:
2.7
作者:
J. Zhuang;Dmitrii Kochkov;Yohai Bar-Sinai;M. Brenner;Stephan Hoyer
通讯作者:
J. Zhuang;Dmitrii Kochkov;Yohai Bar-Sinai;M. Brenner;Stephan Hoyer
DOI:
10.1080/16000870.2019.1696646
发表时间:
2020
期刊:
Dynamic Meteorology and Oceanography
影响因子:
--
作者:
Tabeart J
通讯作者:
Tabeart J
DOI:
10.1073/pnas.1814058116
发表时间:
2019-07-30
影响因子:
11.1
作者:
Bar-Sinai, Yohai;Hoyer, Stephan;Brenner, Michael P.
通讯作者:
Brenner, Michael P.
影响因子:
3.7
作者:
Chandler, Gary J.;Kerswell, Rich R.
通讯作者:
Kerswell, Rich R.