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A novel membrane inlet-infrared gas analysis (MI-IRGA) system for monitoring of seawater carbonate system

Camp, EF and Dong, LF and Suggett, DJ and Smith, DJ and Boatman, TG and Crosswel, JR and Evenhuis, C and Scorfield, S and Walinjkar, A and Woods, J and Lawson, T (2017) 'A novel membrane inlet-infrared gas analysis (MI-IRGA) system for monitoring of seawater carbonate system.' Limnology and Oceanography: Methods, 15 (1). 38 - 53. ISSN 1541-5856

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Abstract

Increased atmospheric CO 2 concentrations are driving changes in ocean chemistry at unprecedented rates resulting in ocean acidification, which is predicted to impact the functioning of marine biota, in particular of marine calcifiers. However, the precise understanding of such impacts relies on an analytical system that determines the mechanisms and impact of elevated pCO 2 on the physiology of organisms at scales from species to entire communities. Recent work has highlighted the need within experiments to control all aspects of the carbonate system to resolve the role of different inorganic carbon species on the physiological responses observed across taxa in real-time. Presently however, there are limited options available for continuous quantification of physiological responses, coupled with real-time calculation of the seawater carbonate chemistry system within microcosm environments. Here, we describe and characterise the performance of a novel pCO 2 membrane equilibrium system (the Membrane Inlet Infra-Red Gas Analyser, MI-IRGA) integrated with a continuous pH and oxygen monitoring platform. The system can detect changes in the seawater carbonate chemistry and determine organism physiological responses, while providing the user with real-time control over the microcosm system. We evaluate the systems control, response time and associated error, and demonstrate the flexibility of the system to operate under field conditions and within a laboratory. We use the system to measure physiological parameters (photosynthesis and respiration) for the corals Pocillipora damicornis and Porites cylindrica; in doing so we present a novel dataset examining the interactive role of temperature, light and pCO 2 on the physiology of P. cylindrica.

Item Type: Article
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Divisions: Faculty of Science and Health > Computer Science and Electronic Engineering, School of
Faculty of Science and Health > Life Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 17 Oct 2016 12:39
Last Modified: 14 Oct 2019 19:15
URI: http://repository.essex.ac.uk/id/eprint/17771

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