{"refrec":{"BRefID":211422,"RR":"<b>Barth, A.; Alvera-Azcárate, A.; Beckers, J.M.; Weisberg, R.H.; Vandenbulcke, L.; Lenartz, F.; Rixen, M.</b> (2009). Dynamically constrained ensemble perturbations - application to tides on the West Florida Shelf. <i>Ocean Sci. 5(3)</i>: 259-270","BEntID":203344,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Ocean Sci. 5(3)</i>: 259-270","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Barth, A.; Alvera-Azcárate, A.; Beckers, J.M.; Weisberg, R.H.; Vandenbulcke, L.; Lenartz, F.; Rixen, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Barth, A. <i>et al.</i>","Englishabstract":"A method is presented to create an ensemble of perturbations that satisfies linear dynamical constraints. A cost function is formulated defining the probability of each perturbation. It is shown that the perturbations created with this approach take the land-sea mask into account in a similar way as variational analysis techniques. The impact of the land-sea mask is illustrated with an idealized configuration of a barrier island. Perturbations with a spatially variable correlation length can be also created by this approach. The method is applied to a realistic configuration of the West Florida Shelf to create perturbations of the M2 tidal parameters for elevation and depth-averaged currents. The perturbations are weakly constrained to satisfy the linear shallow-water equations. Despite that the constraint is derived from an idealized assumption, it is shown that this approach is applicable to a non-linear and baroclinic model. 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