Abstract
To understand and eventually predict oceanic motions and fluxes, it is imperative to be able to follow them in three spatial dimensions and time. The number of observations available for this purpose in the oceans is rather small, compared to those available for the atmosphere. Conventional observations for the oceans, such as given by bathythermographs and current meters, are about 104 times fewer for the ocean than the World Weather Watch provides routinely for the atmosphere. Currently available satellite and other remote-sensing systems yield an observing density for the ocean that is still 10 times lower than for the atmosphere. Both these estimates do take into account the smaller spatial scales and longer time scales of the oceans (Ghil, 1989; Ghil and Malanotte-Rizzoli, 1991). Moreover, the largest number of oceanic observations are confined to the surface and — at best — small subsurface volumes (Munk and Wunsch, 1982).
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Ghil, M., Ide, K. (1994). Extended Kalman Filtering for Vortex Systems: An Example of Observing-System Design. In: Brasseur, P.P., Nihoul, J.C.J. (eds) Data Assimilation. NATO ASI Series, vol 19. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78939-7_7
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