期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 7, 页码 2434-2440出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL059087
关键词
lee waves; deep ocean; current meters
资金
- Strategie d'Attractivite Durable from the Region Bretagne
- CNRS
- NSF [OCE-0851457, OCE-0960834]
- NASA [NNX10AE93G]
- National Oceanography Centre, Southampton, UK
- Marie Curie Career Integration grant
- Directorate For Geosciences
- Division Of Ocean Sciences [0960834] Funding Source: National Science Foundation
- NASA [134922, NNX10AE93G] Funding Source: Federal RePORTER
Using the world's largest data set of in situ ocean current measurements, combined with a high-resolution topography roughness data set, we use a model-assisted hierarchical clustering methodology to estimate the global lee wave generation rate at the ocean floor. Our analysis suggests that internal wave generation contributes 0.750.19 TW (2 standard deviation) to the oceanic energy budget but with a strong dependence on the Brunt-Vaisala (buoyancy) frequency climatology used. This estimate is higher than previous calculations and suggests that internal wave generation may be a much more significant contributor to the global oceanic mechanical energy budget than had previously been assumed. Our results imply that lee wave generation and propagation may be a dominant sink of at least half and potentially the overwhelming majority of ocean surface wind work on the geostrophic circulation.
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