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A Lagrangian biogeochemical study of an eddy in the Northeast Atlantic |
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| Authors: | TD Jickells PS Liss S Turner J Read LM Cardenas F Carse M Hamren-Larssen M Steinke A Thompson SD Archer CS Law PD Nightingale CE Widdicombe LC Gilpin G Savidge P Hadziabdic R Upstill-Goddard R Simó A Allen |
| Institution: | a School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK b Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK c Plymouth Marine Laboratory, Prospect Place, West Hoe, Plymouth PL1 3DH, UK d Department of Environmental Sciences, University of Plymouth, Plymouth PL4 8AA, UK e School of Life Sciences, Napier University, Edinburgh EH10 5DT, UK f School of Biological Sciences, Queen’s University Belfast, Marine Laboratory, The Strand, Portaferry, Co. Down BT22 1PF, UK g Stable Isotope Biochemistry Laboratory, Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, Glasgow G75 0QF, UK h British Oceanographic Data Centre, Joseph Proudman Building, 6 Brownlow Street, Liverpool L35DA, UK i School of Marine Science and Technology, Ridley Building, University of Newcastle upon Tyne NE1 7RU, UK j Institut de Ciències del Mar, CMIMA-CSIC, Pg. Maritim de la Barceloneta 37-49, 08003 Barcelona, Catalonia, Spain k Institute for Atmospheric Science, School of the Environment, University of Leeds, Leeds, LS2 9JT, UK l Institute of Public and Environmental Health, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK m Department of Chemistry, University of Montana, Missoula, MT 59812, USA |
| Abstract: | We report the results of an experiment in the Northeast Atlantic in which sulphur hexafluoride (SF6) was released within an eddy and the behaviour of trace gases, nutrients and productivity followed within a Lagrangian framework over a period of 24 days. Measurements were also made in the air above the eddy in order to estimate air-sea exchange rates for some components. The physical, biological and biogeochemical properties of the eddy resemble those of other eddies studied in this area, suggesting that the results we report may be applicable beyond the specific eddy studied. During a period of low wind speed at the start of the experiment, we are able to quantitatively describe and balance the nutrient and carbon budgets for the eddy. We also report concentrations of various trace gases in the region which are similar to those observed in other studies and we estimate exchange rates for several trace gases. We show that the importance of gas exchange over other loss terms varies with time and also varies for the different gases. We show that the various trace gases considered (CO2, dimethyl sulphide (DMS), N2O, CH4, non-methane-hydrocarbons, methyl bromide, methyl iodide and volatile selenium species) are all influenced by physical and biological processes, but the overall distribution and temporal variability of individual gases are different to one another. A storm disrupted the stratification in the eddy during the experiment, resulting in enhanced nutrient supply to surface waters, enhanced gas exchange rates and a change in plankton community, which we quantify, although overall productivity was little changed. Emphasis is placed on the regularity of storms in the temperate ocean and the importance of these stochastic processes in such systems. |
| Keywords: | Nutrients Trace gases Primary productivity Air-sea exchange |
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