Tracking passive drifters in a high resolution ocean model: implications for interannual variability of larval krill transport to South Georgia

Thorpe, Sally E., Heywood, Karen J. ORCID: https://orcid.org/0000-0001-9859-0026, Stevens, David P. ORCID: https://orcid.org/0000-0002-7283-4405 and Brandon, Mark A. (2004) Tracking passive drifters in a high resolution ocean model: implications for interannual variability of larval krill transport to South Georgia. Deep Sea Research Part I: Oceanographic Research Papers, 51 (7). pp. 909-920. ISSN 1879-0119

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Abstract

A particle tracking scheme that uses velocity output from an interannually varying forced run of a global ocean circulation model (Parallel Ocean Climate Model; POCM_4C) allows variability in the transport pathways across the Scotia Sea to South Georgia to be examined for the first time. The time-variant surface fluxes introduce realistic variability into the model velocity fields. This causes large variations in near-surface, mixed-layer transport from the Antarctic Peninsula region to South Georgia, an island in the southwest Atlantic sector of the Southern Ocean. The variability occurs on a variety of timescales with seasonal and longer periods of variability apparent in the 18 year time series of results. A quasi-four year period of variability is evident across the region in the sea surface temperature fields of POCM_4C and appears in the particle tracking results. This period, noted in other Southern Ocean data sets and ascribed to the Antarctic Circumpolar Wave, has been observed in the reproductive success of higher marine predators breeding on the island. The predicted oceanographic variability is likely to be significant for the South Georgia ecosystem by affecting the influx into the region of Antarctic krill (Euphausia superba), the main prey of the higher predators.

Item Type:	Article
Uncontrolled Keywords:	sdg 13 - climate action,sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/climate_action
Faculty \ School:	Faculty of Science > School of Environmental Sciences Faculty of Science > School of Mathematics University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups:	Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Meteorology, Oceanography and Climate Dynamics (former - to 2017) Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Fluid and Solid Mechanics
Depositing User:	David Stevens
Date Deposited:	01 Dec 2010 14:12
Last Modified:	20 Mar 2023 11:31
URI:	https://ueaeprints.uea.ac.uk/id/eprint/15906
DOI:	10.1016/j.dsr.2004.02.008

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