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Oceanic mesoscale turbulence drives large biogeochemical interannual variability at middle and high latitudes

DRS at CSIR-National Institute of Oceanography

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Title Oceanic mesoscale turbulence drives large biogeochemical interannual variability at middle and high latitudes
 
Creator Levy, M.
Resplandy, L.
Lengaigne, M.
 
Subject AQUATIC COMMUNITIES
AQUATIC ECOLOGY, PRODUCTIVITY
OCEANOGRAPHY AND LIMNOLOGY
 
Description Observed phytoplankton interannual variability has been commonly related to atmospheric variables and climate indices. Here we showed that such relation is highly hampered by internal variability associated with oceanic mesoscale turbulence at middle and high latitudes. We used a 1/54◦idealized biogeochemical model with a seasonally repeating atmospheric forcing such that there was no external source of interannual variability. At the scale of moorings, our experiment suggested that internal variability was responsible for interannual fluctuations of the subpolar phytoplankton bloom reaching 80% in amplitude and 2 weeks in timing. Over broader scales, the largest impact occurred in the subtropics with interannual variations of 20% in new production. The full strength of this variability could not be captured with the same model run at coarser resolution, suggesting that submesoscale resolving models are needed to fully disentangle the major drivers of biogeochemical variability at interannual time scales
 
Date 2017-09-27T13:07:21Z
2017-09-27T13:07:21Z
2014
 
Type Journal Article
 
Identifier Geophysical Research Letters, vol.41; 2014; 2467-2474
http://drs.nio.org/drs/handle/2264/5172
 
Language en
 
Rights Copyright [2014]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher American Geophysical Union