An inverse relationship between production and export efficiency in the Southern Ocean
Charette, Matthew A.
Buesseler, Ken O.
MetadataShow full item record
In the past two decades, a number of studies have been carried out in the Southern Ocean to look at export production using drifting sediment traps and thorium-234 based measurements, which allows us to reexamine the validity of using the existing relationships between production, export efficiency, and temperature to derive satellite-based carbon export estimates in this region. Comparisons of in situ export rates with modeled rates indicate a two to fourfold overestimation of export production by existing models. Comprehensive analysis of in situ data indicates two major reasons for this difference: (i) in situ data indicate a trend of decreasing export efficiency with increasing production which is contrary to existing export models and (ii) the export efficiencies appear to be less sensitive to temperature in this region compared to the global estimates used in the existing models. The most important implication of these observations is that the simplest models of export, which predict increase in carbon flux with increasing surface productivity, may require additional parameters, different weighing of existing parameters, or separate algorithms for different oceanic regimes.
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 40 (2013): 1557–1561, doi:10.1002/grl.50219.
Showing items related by title, author, creator and subject.
Buesseler, Ken O.; Andrews, J. E.; Pike, Steven M.; Charette, Matthew A.; Goldson, Laura E.; Brzezinski, Mark A.; Lance, V. P. (2004-07-26)We studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4 week Fe enrichment experiment conducted in the high-silicate high-nitrate ...
Rosengard, Sarah Z.; Lam, Phoebe J.; Balch, William M.; Auro, Maureen E.; Pike, Steven M.; Drapeau, David T.; Bowler, Bruce C. (Copernicus Publications on behalf of the European Geosciences Union, 2015-07-02)Sequestration of carbon by the marine biological pump depends on the processes that alter, remineralize, and preserve particulate organic carbon (POC) during transit to the deep ocean. Here, we present data collected from ...
Th-234 deficit and excess in the Southern Ocean during spring 2001 : particle export and remineralization Savoye, Nicolas; Buesseler, Ken O.; Cardinal, D.; Dehairs, Frank (American Geophysical Union, 2004-06-16)234Th deficit and excess were examined in the upper 500 m of the Southern Ocean from Sub-Antarctic to Seasonal Ice Zones (Australian sector) during austral spring 2001. 234Th fluxes at 100 m indicate that particle export ...