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High resolution ph measurements using a lab-on-chip sensor in surface waters of northwest European shelf seas

High resolution ph measurements using a lab-on-chip sensor in surface waters of northwest European shelf seas
High resolution ph measurements using a lab-on-chip sensor in surface waters of northwest European shelf seas

Increasing atmospheric CO2 concentrations are resulting in a reduction in seawater pH, with potential detrimental consequences for marine organisms. Improved efforts are required to monitor the anthropogenically driven pH decrease in the context of natural pH variations. We present here a high resolution surface water pH data set obtained in summer 2011 in North West European Shelf Seas. The aim of our paper is to demonstrate the successful deployment of the pH sensor, and discuss the carbonate chemistry dynamics of surface waters of Northwest European Shelf Seas using pH and ancillary data. The pH measurements were undertaken using spectrophotometry with a Lab-on-Chip pH sensor connected to the underway seawater supply of the ship. The main processes controlling the pH distribution along the ship’s transect, and their relative importance, were determined using a statistical approach. The pH sensor allowed 10 measurements h-1 with a precision of 0.001 pH units and a good agreement with pH calculated from a pair of discretely sampled carbonate variables dissolved inorganic carbon (DIC), total alkalinity (TA) and partial pressure of CO2 (pCO2) (e.g., pHDICpCO2). For this summer cruise, the biological activity formed the main control on the pH distribution along the cruise transect. This study highlights the importance of high quality and high resolution pH measurements for the assessment of carbonate chemistry dynamics in marine waters.

European shelf seas, High resolution pH measurements, Lab-on-chip, LOC, Microfluidics, Seawater pH, Spectrophotometry
1424-8220
Rérolle, Victoire M.C.
c30c1441-f55d-48c9-a9c6-659a7a125c60
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Ribas-Ribas, Mariana
85a1f816-cfbd-4a9d-83ff-28611827edcd
Kitidis, Vassilis
dcefa34f-4596-4bbf-b7f8-6b3c422e2df8
Brown, Ian
19c45c4c-f3be-4573-b568-207681d5ce32
Bakker, Dorothee C.E.
c89339eb-bee7-49f7-9410-dc317a009042
Lee, Gareth A.
dd91e0d4-71ce-4d18-a945-1d09e5217543
Mowlem, Matthew C.
6f633ca2-298f-48ee-a025-ce52dd62124f
Rérolle, Victoire M.C.
c30c1441-f55d-48c9-a9c6-659a7a125c60
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Ribas-Ribas, Mariana
85a1f816-cfbd-4a9d-83ff-28611827edcd
Kitidis, Vassilis
dcefa34f-4596-4bbf-b7f8-6b3c422e2df8
Brown, Ian
19c45c4c-f3be-4573-b568-207681d5ce32
Bakker, Dorothee C.E.
c89339eb-bee7-49f7-9410-dc317a009042
Lee, Gareth A.
dd91e0d4-71ce-4d18-a945-1d09e5217543
Mowlem, Matthew C.
6f633ca2-298f-48ee-a025-ce52dd62124f

Rérolle, Victoire M.C., Achterberg, Eric P., Ribas-Ribas, Mariana, Kitidis, Vassilis, Brown, Ian, Bakker, Dorothee C.E., Lee, Gareth A. and Mowlem, Matthew C. (2018) High resolution ph measurements using a lab-on-chip sensor in surface waters of northwest European shelf seas. Sensors (Switzerland), 18 (8), [2622]. (doi:10.3390/s18082622).

Record type: Article

Abstract

Increasing atmospheric CO2 concentrations are resulting in a reduction in seawater pH, with potential detrimental consequences for marine organisms. Improved efforts are required to monitor the anthropogenically driven pH decrease in the context of natural pH variations. We present here a high resolution surface water pH data set obtained in summer 2011 in North West European Shelf Seas. The aim of our paper is to demonstrate the successful deployment of the pH sensor, and discuss the carbonate chemistry dynamics of surface waters of Northwest European Shelf Seas using pH and ancillary data. The pH measurements were undertaken using spectrophotometry with a Lab-on-Chip pH sensor connected to the underway seawater supply of the ship. The main processes controlling the pH distribution along the ship’s transect, and their relative importance, were determined using a statistical approach. The pH sensor allowed 10 measurements h-1 with a precision of 0.001 pH units and a good agreement with pH calculated from a pair of discretely sampled carbonate variables dissolved inorganic carbon (DIC), total alkalinity (TA) and partial pressure of CO2 (pCO2) (e.g., pHDICpCO2). For this summer cruise, the biological activity formed the main control on the pH distribution along the cruise transect. This study highlights the importance of high quality and high resolution pH measurements for the assessment of carbonate chemistry dynamics in marine waters.

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sensors-18-02622 - Version of Record
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More information

Accepted/In Press date: 4 August 2018
e-pub ahead of print date: 10 August 2018
Published date: 10 August 2018
Keywords: European shelf seas, High resolution pH measurements, Lab-on-chip, LOC, Microfluidics, Seawater pH, Spectrophotometry

Identifiers

Local EPrints ID: 424471
URI: http://eprints.soton.ac.uk/id/eprint/424471
ISSN: 1424-8220
PURE UUID: 16556480-31d4-4d12-826b-1c62be561019

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Date deposited: 05 Oct 2018 11:37
Last modified: 07 Oct 2020 00:57

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