On the proportion of ballast versus non-ballast associated carbon export in the surface ocean
Table S1: Locations, cruise names, stations ID, sampling period and reference of the 234Th derived POC and mineral exports data used in this study. (5.146Kb)
Table S2: Station groups, corresponding cruises, enclosed stations, sample number and corresponding oceanic province. (571bytes)
Le Moigne, Frederic A. C.
Sanders, Richard J.
Martin, Adrian P.
Morris, Paul J.
Thomalla, Sandy J.
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The role of biominerals in driving carbon export from the surface ocean is unclear. We compiled surface particulate organic carbon (POC), and mineral ballast export fluxes from 55 different locations in the Atlantic and Southern Oceans. Substantial surface POC export accompanied by negligible mineral export was recorded implying that association with mineral phases is not a precondition for organic export to occur. The proportion of non-mineral associated sinking POC ranged from 0 to 80% and was highest in areas previously shown to be dominated by diatoms. This is consistent with previous estimates showing that transfer efficiency in such regions is low. However we propose that, rather than the low transfer efficiency arising from diatom blooms being inherently characterized by poorly packaged aggregates which are efficiently exported but which disintegrate readily in mid water, it is due to such environments having very high levels of unballasted organic C export.
Author Posting. © American Geophysical Union, 2012. 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 39 (2012): L15610, doi:10.1029/2012GL052980.
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