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| Titel |
Characteristics of lee wave generation in the World Ocean |
| VerfasserIn |
Robert Scott, John Goff, Alberto Garabato, George Nurser |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250049407
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| Zusammenfassung |
| The rate of generation of internal gravity waves in the lee of small length scale topography by
geostrophic flow in the World Ocean was estimated using simple linear theory with
corrections for finite amplitude topography. Several global data sets were combined for the
calculation including a global ocean general circulation model for the near-bottom
geostrophic flow statistics, over 500 moored abyssal current meter records to assess the
model, historical climatological data for the buoyancy frequency, 178 deep water CTD casts
to assess the climatological data, and two independent estimates of the small scale
topographic statistical properties. The first topography estimate was based on an
empirically-derived relationship between paleo-spreading rates and abyssal hill roughness,
with corrections for sedimentation. The second estimate was based on small-scale
(< 100Â km) roughness of satellite altimetry-derived gravity field, using upward
continuation relationships to derive estimates of abyssal hill roughness at the seafloor
at scales less than approximately 20Â km. Lee waves generation was found to be
an important part of the global mechanical energy budget of the balanced flow. |
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