Sampling, feasibility, and priors in data assimilation
- Univ. of Kansas, Lawrence, KS (United States)
- Univ. of Arizona, Tucson, AZ (United States)
- Oregon State Univ., Corvallis, OR (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Importance sampling algorithms are discussed in detail, with an emphasis on implicit sampling, and applied to data assimilation via particle filters. Implicit sampling makes it possible to use the data to find high-probability samples at relatively low cost, making the assimilation more efficient. A new analysis of the feasibility of data assimilation is presented, showing in detail why feasibility depends on the Frobenius norm of the covariance matrix of the noise and not on the number of variables. A discussion of the convergence of particular particle filters follows. A major open problem in numerical data assimilation is the determination of appropriate priors, a progress report on recent work on this problem is given. The analysis highlights the need for a careful attention both to the data and to the physics in data assimilation problems.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1439205
- Alternate ID(s):
- OSTI ID: 1379537
- Journal Information:
- Discrete and Continuous Dynamical Systems, Vol. 36, Issue 8; ISSN 1078-0947
- Publisher:
- American Institute of Mathematical SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Joint state-parameter estimation of a nonlinear stochastic energy balance model from sparse noisy data
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journal | January 2019 |
Joint state-parameter estimation of a nonlinear stochastic energy balance model from sparse noisy data | text | January 2019 |
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