The University of Southampton
University of Southampton Institutional Repository

Contrasting effects of temperature and winter mixing on the seasonal and inter-annual variability of the carbonate system in the Northeast Atlantic Ocean

Contrasting effects of temperature and winter mixing on the seasonal and inter-annual variability of the carbonate system in the Northeast Atlantic Ocean
Contrasting effects of temperature and winter mixing on the seasonal and inter-annual variability of the carbonate system in the Northeast Atlantic Ocean
Future climate change as a result of increasing atmospheric CO2 concentrations is expected to strongly affect the oceans, with shallower winter mixing and consequent reduction in primary production and oceanic carbon drawdown in low and mid-latitudinal oceanic regions. Here we test this hypothesis by examining the effects of cold and warm winters on the carbonate system in the surface waters of the Northeast Atlantic Ocean for the period between 2005 and 2007. Monthly observations were made between the English Channel and the Bay of Biscay using a ship of opportunity program. During the colder winter of 2005/2006, the maximum depth of the mixed layer reached up to 650 m in the Bay of Biscay, whilst during the warmer (by 2.6 ± 0.5 °C) winter of 2006/2007 the mixed layer depth reached only 300 m. The inter-annual differences in late winter concentrations of nitrate (2.8 ± 1.1 ?mol l?1) and dissolved inorganic carbon (22 ± 6 ?mol kg?1, with higher concentrations at the end of the colder winter (2005/2006), led to differences in the dissolved oxygen anomaly and the chlorophyll ?-fluorescence data for the subsequent growing season. In contrast to model predictions, the calculated air-sea CO2 fluxes (ranging from +3.7 to ?4.8 mmol m?2 d?1) showed an increased oceanic CO2 uptake in the Bay of Biscay following the warmer winter of 2006/2007 associated with wind speed and sea surface temperature differences.
1726-4170
1481-1492
Dumousseaud, C.
31cc4879-0d45-4674-8eba-93105ee25c2e
Achterberg, E.P.
685ce961-8c45-4503-9f03-50f6561202b9
Tyrrell, T.
6808411d-c9cf-47a3-88b6-c7c294f2d114
Charalampopoulou, A.
edaaa0e5-b045-4d54-8965-213c4c6079f2
Schuster, U.
43c12cdf-e87d-4379-a19c-e22246888c82
Hartman, M.
cdd63b60-f89a-4ef8-842d-7803f8213c18
Hydes, D.J.
ac7371d4-c2b9-4926-bb77-ce58480ecff7
Dumousseaud, C.
31cc4879-0d45-4674-8eba-93105ee25c2e
Achterberg, E.P.
685ce961-8c45-4503-9f03-50f6561202b9
Tyrrell, T.
6808411d-c9cf-47a3-88b6-c7c294f2d114
Charalampopoulou, A.
edaaa0e5-b045-4d54-8965-213c4c6079f2
Schuster, U.
43c12cdf-e87d-4379-a19c-e22246888c82
Hartman, M.
cdd63b60-f89a-4ef8-842d-7803f8213c18
Hydes, D.J.
ac7371d4-c2b9-4926-bb77-ce58480ecff7

Dumousseaud, C., Achterberg, E.P., Tyrrell, T., Charalampopoulou, A., Schuster, U., Hartman, M. and Hydes, D.J. (2010) Contrasting effects of temperature and winter mixing on the seasonal and inter-annual variability of the carbonate system in the Northeast Atlantic Ocean. Biogeosciences, 7 (5), 1481-1492. (doi:10.5194/bg-7-1481-2010).

Record type: Article

Abstract

Future climate change as a result of increasing atmospheric CO2 concentrations is expected to strongly affect the oceans, with shallower winter mixing and consequent reduction in primary production and oceanic carbon drawdown in low and mid-latitudinal oceanic regions. Here we test this hypothesis by examining the effects of cold and warm winters on the carbonate system in the surface waters of the Northeast Atlantic Ocean for the period between 2005 and 2007. Monthly observations were made between the English Channel and the Bay of Biscay using a ship of opportunity program. During the colder winter of 2005/2006, the maximum depth of the mixed layer reached up to 650 m in the Bay of Biscay, whilst during the warmer (by 2.6 ± 0.5 °C) winter of 2006/2007 the mixed layer depth reached only 300 m. The inter-annual differences in late winter concentrations of nitrate (2.8 ± 1.1 ?mol l?1) and dissolved inorganic carbon (22 ± 6 ?mol kg?1, with higher concentrations at the end of the colder winter (2005/2006), led to differences in the dissolved oxygen anomaly and the chlorophyll ?-fluorescence data for the subsequent growing season. In contrast to model predictions, the calculated air-sea CO2 fluxes (ranging from +3.7 to ?4.8 mmol m?2 d?1) showed an increased oceanic CO2 uptake in the Bay of Biscay following the warmer winter of 2006/2007 associated with wind speed and sea surface temperature differences.

This record has no associated files available for download.

More information

Published date: 2010
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 161377
URI: http://eprints.soton.ac.uk/id/eprint/161377
ISSN: 1726-4170
PURE UUID: a7a97f18-22f2-4d2d-802b-2c98b3cd9758
ORCID for C. Dumousseaud: ORCID iD orcid.org/0000-0001-5995-902X
ORCID for T. Tyrrell: ORCID iD orcid.org/0000-0002-1002-1716

Catalogue record

Date deposited: 28 Jul 2010 15:00
Last modified: 25 Jun 2024 01:42

Export record

Altmetrics

Contributors

Author: C. Dumousseaud ORCID iD
Author: E.P. Achterberg
Author: T. Tyrrell ORCID iD
Author: A. Charalampopoulou
Author: U. Schuster
Author: M. Hartman
Author: D.J. Hydes

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×