The fine-structure contamination of vertical velocity spectra in the deep ocean

Siedler, Gerold (1974) The fine-structure contamination of vertical velocity spectra in the deep ocean Deep Sea Research and Oceanographic Abstracts, 21 (1). pp. 37-46. DOI 10.1016/0011-7471(74)90017-5.

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When determining vertical velocity spectra from temperature time series and the mean vertical temperature gradient, restrictions may arise friom the existence of fine-structre. Phillips (1971) and Garrett and Munk (1971_ have shown that the fine-structure contamination of internal gravity wave spectra can be written as a function of some statistical properties of the internal wave field and the vertical wave number spectrum of the fine-structure. A consistent set of current and temperature data was obtained during an experiment at Site D to study this problem. The wave number spectrum of the vertical temperature fine-structure and the apparent frequently spectrum of internal waves are determined from these data. In contrast to the asasumptions in the above models, our fine-structure data imply a wave number spectrum proportional to (wave number)−3 in the range which is important here. Using the above set of data, a model is suggested to describe the effect of fine-structure on vertical velocity spectra computed with the mean vertical temperature gradient. It indicates a maximum fine-structure contamination of the true frequency spectrum of internal gravity waves in the middle of the internal wave band, with less contamination at low and high frequencies.

Document Type: Article
Keywords: physical oceanography; deep sea
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
DOI etc.: 10.1016/0011-7471(74)90017-5
ISSN: 0011-7471
Date Deposited: 11 Sep 2012 09:52
Last Modified: 08 Mar 2018 14:12

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