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Going with the flow: The role of ocean circulation in global marine ecosystems under a changing climate

van Gennip, S.J.; Popova, E.E.; Yool, A.; Pecl, G.T.; Hobday, A.J.; Sorte, C.J.B.. 2017 Going with the flow: The role of ocean circulation in global marine ecosystems under a changing climate. Global Change Biology, 23 (7). 2602-2617. 10.1111/gcb.13586

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Accepted for publication in Global Change Biology. © 2017 American Geophysical Union. Further reproduction or electronic distribution is not permitted.
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Abstract/Summary

Ocean warming, acidification, deoxygenation and reduced productivity are widely considered to be the major stressors to ocean ecosystems induced by emissions of CO2. However, an overlooked stressor is the change in ocean circulation in response to climate change. Strong changes in the intensity and position of the western boundary currents have already been observed, and the consequences of such changes for ecosystems are beginning to emerge. In this study, we address climatically induced changes in ocean circulation on a global scale but relevant to propagule dispersal for species inhabiting global shelf ecosystems, using a high resolution global ocean model run under the IPCC RCP 8.5 scenario. The ¼ degree model resolution allows improved regional realism of the ocean circulation beyond that of available CMIP5-class models. We use a Lagrangian approach forced by modelled ocean circulation to simulate the circulation pathways that disperse planktonic life stages. Based on trajectory backtracking, we identify present-day coastal retention, dominant flow and dispersal range for coastal regions at the global scale. Projecting into the future, we identify areas of the strongest projected circulation change and present regional examples with the most significant modifications in their dominant pathways. Climatically-induced changes in ocean circulation should be considered as an additional stressor of marine ecosystems in a similar way to ocean warming or acidification.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/gcb.13586
ISSN: 13541013
Additional Keywords: climate change; global ocean circulation model; larval dispersal range; coastal connectivity; ecosystems
Date made live: 10 Jan 2017 14:16 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/515757

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