Published April 23, 2021
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Uncertainties of particulate organic carbon concentrations in the mesopelagic zone of the Atlantic ocean
Authors/Creators
- 1. Plymouth Marine Laboratory, Prospect Place, Plymouth, PL1 3DH, UK
- 2. National Centre for Earth Observation, Plymouth, PL1 3DH, UK
- 3. National Centre for Earth Observation, Reading, RG6 6AH, UK
- 4. Sorbonne Universités, Laboratoire d'Océanographie de Villefranche, Institut de la Mer de Villefranche, Villefranche-sur-Mer, 06230, France
- 5. University of Reading, Reading, Berkshire, RG6 6AH, UK
Description
Measurements of particulate organic carbon (POC) in the open ocean provide grounds for estimating oceanic carbon budgets and for modelling carbon cycling. The majority of the published POC measurements have been collected at the sea surface. Thus, POC stocks in the upper layer of the water column are relatively well constrained. However, our understanding of the POC distribution and its dynamics in deeper areas is modest due to insufficient in POC measurements. Moreover, the accuracy of published POC estimates is not always quantified, and neither is it fully understood. In this study, we determined the POC concentrations of samples collected in the upper 500 m during an Atlantic Meridional Transect and described a method for quantifying its experimental uncertainties using duplicate measurements. The analysis revealed that the medians of the total experimental uncertainties associated with our POC concentrations in the productive and mesopelagic zones were 2.5(±1.2) mg/m3 and 2.6(±0.6) mg/m3, respectively. In relative terms, these uncertainties corresponded to ~14% and ~ 35% of POC concentrations, respectively. However, despite our best efforts, we could explain only ~ 21% of the total experimental POC uncertainty. The potential sources of this unexplained portion of uncertainty are discussed.
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