Towards an integrated observation and modeling system in the New York Bight using variational methods. Part II : repressenter-based observing strategy evaluation


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dc.contributor.author Zhang, Weifeng G.
dc.contributor.author Wilkin, John L.
dc.contributor.author Levin, Julia C.
dc.date.accessioned 2010-11-19T18:32:53Z
dc.date.available 2010-11-19T18:32:53Z
dc.date.issued 2009-09-23
dc.identifier.uri http://hdl.handle.net/1912/4102
dc.description Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Ocean Modelling 35 (2010): 134-145, doi:10.1016/j.ocemod.2010.06.006. en_US
dc.description.abstract As part of an effort to build an integrated observation and modeling system for the New York Bight, this study explores observing system design using a representer-based method. The Representer of a single observation describes the covariance between the observed quantity and ocean state at all locations at any time. It is related closely to the influence of the observation on control variable correction in a 4D Variational data assimilation system. We prove that these properties hold for the combination of representers that is associated with an arithmetic function of model variables or a group of observations. The representer-based method is used here to identify which of a set of proposed tracks for an autonomous coastal glider is better for predicting horizontal salt flux within the Hudson Shelf Valley in a 2-day forecast period. Twin experiments confirm the result. The system is also used to compare different observation strategies. We show that a glider that traverses a regular transect influences a larger area than a continuously profiling mooring, but the mooring carries stronger influence at the observation location. The representer analysis shows how the information provided by observations extends toward the dynamically upstream and how increasing the duration of the analysis window captures more dynamical connections and expands the area of influence of the observations in data assimilation. Overall, the study demonstrates that the representer methodology can quantitatively contrast different observational strategies and determine spatial patterns and temporal extent of the influence of observations, both of which are helpful for evaluating the design of observation networks. en_US
dc.description.sponsorship This work was funded by National Science Foundation grant OCE-0238957. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.relation.uri http://dx.doi.org/10.1016/j.ocemod.2010.06.006
dc.subject Representer en_US
dc.subject Adjoint en_US
dc.subject Observing system design en_US
dc.subject Adaptive sampling en_US
dc.subject Observation influence en_US
dc.subject New York Bight en_US
dc.title Towards an integrated observation and modeling system in the New York Bight using variational methods. Part II : repressenter-based observing strategy evaluation en_US
dc.type Preprint en_US

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