Abstract
Regional ocean models are capable of forecasting conditions for usefully long intervals of time (days) provided that initial and ongoing conditions can be measured. In resource-limited circumstances, the placement of sensors in optimal locations is essential. Here, a nonlinear optimization approach to determine optimal adaptive sampling that uses the genetic algorithm (GA) method is presented. The method determines sampling strategies that minimize a user-defined physics-based cost function. The method is evaluated using identical twin experiments, comparing hindcasts from an ensemble of simulations that assimilate data selected using the GA adaptive sampling and other methods. For skill metrics, we employ the reduction of the ensemble root mean square error (RMSE) between the “true” data-assimilative ocean simulation and the different ensembles of data-assimilative hindcasts. A five-glider optimal sampling study is set up for a 400 km × 400 km domain in the Middle Atlantic Bight region, along the New Jersey shelf-break. Results are compared for several ocean and atmospheric forcing conditions.
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Acknowledgments
We are very thankful to W.G. Leslie for his help with the merging of atmospheric forcing fields used in the ocean simulations, to G. Gawarkiewicz and P. Abbot for their AWACS-SW06 ocean data, and to M. Taylor and J. Hare for their NMFS survey data. We also thank J. Evans, S. Glenn, and J. Wilkin for their real-time WRF atmospheric fluxes and the FNMOC teams for their own products. This work was supported in part by a Space and Naval Warfare Center (SPAWAR) SBIR program. PFJL and PJH are also grateful to the Office of Naval Research for partial support under grants N00014-14-1-0476 (Science of Autonomy LEARNS) and N00014-12-1-0944 (ONR6.2) to the Massachusetts Institute of Technology and N00014-11-1-0701 (MURI-IODA) to Woods Hole Oceanographic Institution. TFD’s contribution was funded by the SBIR and grant N00014- 11-1-0701 (MURI-IODA).
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Heaney, K.D., Lermusiaux, P.F., Duda, T.F. et al. Validation of genetic algorithm-based optimal sampling for ocean data assimilation. Ocean Dynamics 66, 1209–1229 (2016). https://doi.org/10.1007/s10236-016-0976-5
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DOI: https://doi.org/10.1007/s10236-016-0976-5