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Correction of Biogeochemical-Argo Radiometry for Sensor Temperature-Dependence and Drift: Protocols for a Delayed-Mode Quality Control

Authors :
Quentin Jutard
Emanuele Organelli
Nathan Briggs
Xiaogang Xing
Catherine Schmechtig
Emmanuel Boss
Antoine Poteau
Edouard Leymarie
Marin Cornec
Fabrizio D’Ortenzio
Hervé Claustre
Source :
Sensors, Vol 21, Iss 18, p 6217 (2021)
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

Measuring the underwater light field is a key mission of the international Biogeochemical-Argo program. Since 2012, 0–250 dbar profiles of downwelling irradiance at 380, 412 and 490 nm besides photosynthetically available radiation (PAR) have been acquired across the globe every 1 to 10 days. The resulting unprecedented amount of radiometric data has been previously quality-controlled for real-time distribution and ocean optics applications, yet some issues affecting the accuracy of measurements at depth have been identified such as changes in sensor dark responsiveness to ambient temperature, with time and according to the material used to build the instrument components. Here, we propose a quality-control procedure to solve these sensor issues to make Argo radiometry data available for delayed-mode distribution, with associated error estimation. The presented protocol requires the acquisition of ancillary radiometric measurements at the 1000 dbar parking depth and night-time profiles. A test on >10,000 profiles from across the world revealed a quality-control success rate >90% for each band. The procedure shows similar performance in re-qualifying low radiometry values across diverse oceanic regions. We finally recommend, for future deployments, acquiring daily 1000 dbar measurements and one night profile per year, preferably during moonless nights and when the temperature range between the surface and 1000 dbar is the largest.

Details

Language :
English
ISSN :
14248220
Volume :
21
Issue :
18
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.666ae1a738a44e66a423ff4aa7aaece8
Document Type :
article
Full Text :
https://doi.org/10.3390/s21186217