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Nepheloid layer, sediment

  • 2003
  • OriginalPaper
  • Chapter
Published in:
Author
I. Nicholas McCave
Published in
Encyclopedia of Sediments and Sedimentary Rocks
Publisher
Springer Netherlands

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Excerpt

The lower water column in most parts of the ocean, both shelf waters and the deep sea, shows a large increase in light scattering and attenuation conferred by the presence of increased amounts of fine-grained particulate material. This has been confirmed by size measurements and filtration of seawater with gravimetric analysis. This part of the water column is termed the bottom nepheloid layer (BNL) (Figure N3). Optical work shows that the BNL is up to 2000 m thick and generally has a basal uniform region, the bottom mixed nepheloid layer, corresponding quite closely to the bottom mixed layer defined by constant potential temperature. Above this light scattering falls off more or less exponentially to the clear-water minimum marking the top of the BNL.
Figure N3
Full depth nephelometer profile in the Rockall Trough.
Bottom, intermediate and surface nepheloid layers and the clear water minimum are apparent as well as two large inversions (after McCave, 1986). The instrument is uncalibrated but in this area the maximum concentration is probably of order 500 mg m−3
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previous chapter Neomorphism and recrystallization
next chapter Neritic carbonate depositional environments
Title
Nepheloid layer, sediment
Author
I. Nicholas McCave
Copyright Year
2003
Publisher
Springer Netherlands
Book
Encyclopedia of Sediments and Sedimentary Rocks

Print ISBN: 978-1-4020-0872-6

Electronic ISBN: 978-1-4020-3609-5

Copyright Year: 2003

DOI
https://doi.org/10.1007/978-1-4020-3609-5_144
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