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Robust Sensor for Extended Autonomous Measurements of Surface Ocean Dissolved Inorganic Carbon
journal contribution
posted on 2015-03-17, 00:00 authored by Andrea J. Fassbender, Christopher L. Sabine, Noah Lawrence-Slavas, Eric H. De Carlo, Christian Meinig, Stacy Maenner JonesOcean carbon monitoring
efforts have increased dramatically in
the past few decades in response to the need for better marine carbon
cycle characterization. Autonomous pH and carbon dioxide (CO2) sensors capable of yearlong deployments are now commercially available;
however, due to their strong covariance, this is the least desirable
pair of carbonate system parameters to measure for high-quality, in
situ, carbon-cycle studies. To expand the number of tools available
for autonomous carbonate system observations, we have developed a
robust surface ocean dissolved inorganic carbon (DIC) sensor capable
of extended (>year) field deployments with a laboratory determined
uncertainty of ±5 μmol kg–1. Results
from the first two field tests of this prototype sensor indicate that
measurements of DIC are ∼90% more accurate than estimates of
DIC calculated from contemporaneous and collocated measurements of
pH and CO2. The improved accuracy from directly measuring
DIC gives rise to new opportunities for quantitative, autonomous carbon-cycle
studies.
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surface oceancarbon dioxideExtended Autonomous MeasurementsDICfield testscollocated measurementscarbonate system parametersCO 2.Surface Ocean DissolvedAutonomous pHfield deploymentsRobust Sensorcarbonate system observationsCarbonOcean carbon monitoring effortsprototype sensormarine carbon cycle characterization
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