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Depth attenuation of organic matter export associated with jelly falls

Record type: Article

We explore the attenuation in the export ratio of jelly-POM (particulate organic matter) with depth as a function of the decay rate, temperature, and sedimentation rate. Using data from the Vertical Transport In the Global Ocean project, we compare ratios computed with the Martin-curve, with a particle-based parameterization, and with sediment-trap data. Owing to the temperature dependence of the decay rate (Q10 5 4.28), the jelly-POM export ratio below 500m is 20–45% larger in subpolar and temperate areas than in the tropics. Vertical migration of gelatinous zooplankton leads to a variable starting depth of a jelly fall (death depth), which governs the start of remineralization, and the fate of the biomass. Owing to the absence of observations, we employ a sinking speed matrix ranging from 100 m d21 to 1500 m d21 to represent slow- and fast-sinking carcasses. The assumption of a constant decay rate k independent of temperature in other particle-based models may not be appropriate. These results provide information for including jelly-POM in global biogeochemical model formulations.

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Citation

Lebrato, Mario, Pahlow, Markus, Oschlies, Andreas, Pitt, Kylie A., Jones, Daniel O.B., Molinero, Juan Carlos and Condon, Robert. H. (2011) Depth attenuation of organic matter export associated with jelly falls Limnology and Oceanography, 56, (5), pp. 1917-1928. (doi:10.4319/lo.2011.56.5.1917).

More information

Published date: 2011
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 197475
URI: http://eprints.soton.ac.uk/id/eprint/197475
ISSN: 0024-3590
PURE UUID: 56813a3c-5b89-49eb-87c9-4a5c8bfd4527

Catalogue record

Date deposited: 23 Sep 2011 12:12
Last modified: 18 Jul 2017 11:20

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Contributors

Author: Mario Lebrato
Author: Markus Pahlow
Author: Andreas Oschlies
Author: Kylie A. Pitt
Author: Daniel O.B. Jones
Author: Juan Carlos Molinero
Author: Robert. H. Condon

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