Simulating natural carbon sequestration in the Southern Ocean: on uncertainties associated with eddy parameterizations and iron deposition.

Dietze, Heiner, Getzlaff, Julia and Löptien, Ulrike (2017) Simulating natural carbon sequestration in the Southern Ocean: on uncertainties associated with eddy parameterizations and iron deposition. Open Access Biogeosciences (BG), 14 . pp. 1561-1576. DOI 10.5194/bg-14-1561-2017.

[img]
Preview
Text
bg-14-1561-2017.pdf - Published Version
Available under License Creative Commons: Attribution 3.0.

Download (4Mb) | Preview

Supplementary data:

Abstract

The Southern Ocean is a major sink for anthropogenic carbon. Yet, there is no quantitative consensus about how this sink will change when surface winds increase (as they are anticipated to do). Among the tools employed to quantify carbon uptake are global coupled ocean-circulation biogeochemical models. Because of computational limitations these models still fail to resolve potentially-important spatial scales. Instead, processes on these scales are parameterized. There is concern that deficiencies in these so-called eddy-parameterizations might imprint wrong sensitivities of projected oceanic carbon uptake. Here, we compare natural carbon uptake in the Southern Ocean simulated with contemporary eddy-parameterizations. We find that very differing parameterizations yield surprisingly similar oceanic carbon in response to strengthening winds. In contrast, we find (in an additional simulation) that the carbon uptake does differ substantially when the supply of bioavailable iron is altered within its envelope of uncertainty. We conclude that a more comprehensive understanding of bioavailable iron dynamics will substantially reduce the uncertainty of model-based projections of oceanic carbon uptake.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-14-1561-2017
ISSN: 1726-4170
Related URLs:
Projects: BIOACID
Date Deposited: 02 Nov 2016 07:43
Last Modified: 05 Apr 2017 13:18
URI: http://oceanrep.geomar.de/id/eprint/34510

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...