Consistent increase in dimethyl sulphide (DMS) in response to high CO2 in five shipboard bioassays from contrasting NW European waters

Hopkins, FE; Archer, SD. 2014 Consistent increase in dimethyl sulphide (DMS) in response to high CO2 in five shipboard bioassays from contrasting NW European waters [in special issue: Field investigation of ocean acidification effects in northwest European seas] Biogeosciences Discussions, 11. 2267-2303. 10.5194/bgd-11-2267-2014

[img]
Preview
Text
Hopkins and Archer BGD 2014.pdf

Download (5MB) | Preview

Abstract/Summary

The ubiquitous marine trace gas dimethyl sulphide (DMS) comprises the greatest natural source of sulphur to the atmosphere and is a key player in atmospheric chemistry and climate. We explore the short term response of DMS and its algal precursor dimethyl sulphoniopropionate (DMSP) production and cycling to elevated carbon dioxide (CO2) and ocean acidification (OA) in five highly replicated 96 h shipboard bioassay experiments from contrasting sites in NW European shelf waters. In general, the response to OA throughout this region showed little variation, despite encompassing a range of biological and biogeochemical conditions. We observed consistent and marked increases in DMS concentrations relative to ambient controls, and decreases in DMSP concentrations. Quantification of rates of specific DMSP synthesis by phytoplankton and bacterial DMS gross production/consumption suggest algal processes dominated the CO2 response, likely due to a physiological response manifested as increases in direct cellular exudation of DMS and/or DMSP lyase enzyme activities. The variables and rates we report increase our understanding of the processes behind the response to OA. This could provide the opportunity to improve upon mesocosm-derived empirical modelling relationships, and move towards a mechanistic approach for predicting future DMS concentrations.

Item Type: Publication - Article
Subjects: Chemistry
Ecology and Environment
Marine Sciences
Oceanography
Divisions: Plymouth Marine Laboratory > Science Areas > Cycling in the Sunlit Ocean
Depositing User: Dr Frances Hopkins
Date made live: 10 Jun 2014 13:42
Last Modified: 06 Jun 2017 16:11
URI: http://plymsea.ac.uk/id/eprint/6069

Actions (login required)

View Item View Item