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Frederick T. Mayer and Oliver B. Fringer

1. Introduction In the ocean, because lee waves occur on length scales smaller than the resolution of global circulation models (GCMs), the lee wave drag must be parameterized. Existing parameterizations are based on steady-state solutions for the flow above “linear-height” hills, wherein the height of the hill is much smaller than the wavelength of the wave ( Bell 1975b ; Gill 1982 ). Most common among the unresolved bathymetric features of the deep ocean are the abyssal hills which are

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Magdalena Andres, Ruth C. Musgrave, Daniel L. Rudnick, Kristin L. Zeiden, Thomas Peacock, and Jae-Hun Park

round-trip acoustic travel time between 1000 m and the surface ( τ 1000 ) in the western Pacific. The model’s performance is evaluated by comparing at the PIES sites the calculated τ 1000 (modeled) with τ LP (observed). The variability captured by the model compares favorably to that measured by the FLEAT PIESs (e.g., that for site F5 is shown in Fig. 19a ). Correlation coefficients between τ 1000 and τ LP at the eight PIES sites show statistically significant values, ranging from 0.35 at F

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