Enhanced ocean carbon storage from anaerobic alkalinity generation in coastal sediments.

Thomas, H., Schiettecatte, L.-S., Suykens, K., Koné, Y. J. M., Shadwick, E. H., Prowe, Friederike , Bozec, Y., de Baar, H. J. W. and Borges, A. V. (2009) Enhanced ocean carbon storage from anaerobic alkalinity generation in coastal sediments. Open Access Biogeosciences (BG), 6 (2). pp. 267-274. DOI 10.5194/bg-6-267-2009.

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The coastal ocean is a crucial link between land, the open ocean and the atmosphere. The shallowness of the water column permits close interactions between the sedimentary, aquatic and atmospheric compartments, which otherwise are decoupled at long time scales (≅ 1000 yr) in the open oceans. Despite the prominent role of the coastal oceans in absorbing atmospheric CO2 and transferring it into the deep oceans via the continental shelf pump, the underlying mechanisms remain only partly understood. Evaluating observations from the North Sea, a NW European shelf sea, we provide evidence that anaerobic degradation of organic matter, fuelled from land and ocean, generates total alkalinity (AT) and increases the CO2 buffer capacity of seawater. At both the basin wide and annual scales anaerobic AT generation in the North Sea's tidal mud flat area irreversibly facilitates 7–10%, or taking into consideration benthic denitrification in the North Sea, 20–25% of the North Sea's overall CO2 uptake. At the global scale, anaerobic AT generation could be accountable for as much as 60% of the uptake of CO2 in shelf and marginal seas, making this process, the anaerobic pump, a key player in the biological carbon pump. Under future high CO2 conditions oceanic CO2 storage via the anaerobic pump may even gain further relevance because of stimulated ocean productivity.

Document Type: Article
Keywords: alkalinity, shelf seas, ocean carbon uptake
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-6-267-2009
ISSN: 1726-4170
Projects: Future Ocean
Date Deposited: 22 Sep 2009 14:16
Last Modified: 23 Sep 2019 21:02
URI: http://oceanrep.geomar.de/id/eprint/935

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