Data assimilation considerations for improved ocean predictability during the Gulf of Mexico Grand Lagrangian Deployment (GLAD)
| Autor: | B.L. Lipphardt, Darek Bogucki, Arthur J. Mariano, M. Josefina Olascoaga, Angelique C. Haza, Gregg A. Jacobs, Arnoldo Valle-Levinson, Falko Judt, Peter L. Spence, Helga S. Huntley, Patrick J. Hogan, Mozheng Wei, Edward H. Ryan, Shuyi S. Chen, Ad Reniers, Guillaume Novelli, Andrew C. Poje, Francisco J. Beron-Vera, Milan Curcic, Hans Ngodock, Prasad G. Thoppil, Mohamed Iskandarani, Clark Rowley, A. D. Kirwan, Brent Bartels, Emanuel Coelho, Nathan J. M. Laxague, Scott Smith, Brian K. Haus, Robert W. Helber, Matthew Gough, Tamay M. Özgökmen, Annalisa Griffa |
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| Rok vydání: | 2014 |
| Předmět: |
Ocean
Gulf of Mexico Atmospheric Science Covariance Meteorology Computer science Ocean current Modeling Interval (mathematics) Geotechnical Engineering and Engineering Geology Oceanography Drifter Data assimilation Data acquisition Assimilation Computer Science (miscellaneous) Satellite Predictability |
| Zdroj: | Ocean modelling (Oxf., Print) 83 (2014): 98–117. doi:10.1016/j.ocemod.2014.09.003 info:cnr-pdr/source/autori:Jacobs, Gregg A.; Bartels, Brent P.; Bogucki, Darek J.; Beron-Vera, Francisco J.; Chen, Shuyi S.; Coelho, Emanuel F.; Curcic, Milan; Griffa, Annalisa; Gough, Matthew; Haus, Brian K.; Haza, Angelique C.; Helber, Robert W.; Hogan, Patrick J.; Huntley, Helga S.; Iskandarani, Mohamed; Judt, Falko; Kirwan, A. D., Jr.; Laxague, Nathan; Valle-Levinson, Arnoldo; Lipphardt, Bruce L., Jr.; Mariano, Arthur J.; Ngodock, Hans E.; Novelli, Guillaume; Olascoaga, M. Josefina; Oezgoekmen, Tamay M.; Poje, Andrew C.; Reniers, Ad J. H. M.; Rowley, Clark D.; Ryan, Edward H.; Smith, Scott R.; Spence, Peter L.; Thoppil, Prasad G.; Wei, Mozheng/titolo:Data assimilation considerations for improved ocean predictability during the Gulf of Mexico Grand Lagrangian Deployment (GLAD)/doi:10.1016%2Fj.ocemod.2014.09.003/rivista:Ocean modelling (Oxf., Print)/anno:2014/pagina_da:98/pagina_a:117/intervallo_pagine:98–117/volume:83 |
| ISSN: | 1463-5003 |
| Popis: | Ocean prediction systems rely on an array of assumptions to optimize their data assimilation schemes. Many of these remain untested, especially at smaller scales, because sufficiently dense observations are very rare. A set of 295 drifters deployed in July 2012 in the north-eastern Gulf of Mexico provides a unique opportunity to test these systems down to scales previously unobtainable. In this study, background error covariance assumptions in the 3DVar assimilation process are perturbed to understand the effect on the solution relative to the withheld dense drifter data. Results show that the amplitude of the background error covariance is an important factor as expected, and a proposed new formulation provides added skill. In addition, the background error covariance time correlation is important to allow satellite observations to affect the results over a period longer than one daily assimilation cycle. The results show the new background error covariance formulations provide more accurate placement of frontal positions, directions of currents and velocity magnitudes. These conclusions have implications for the implementation of 3DVar systems as well as the analysis interval of 4DVar systems. Published by Elsevier Ltd. |
| Databáze: | OpenAIRE |
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