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Correction of Biogeochemical-Argo Radiometry for Sensor Temperature-Dependence and Drift: Protocols for a

Quentin Jutard¹, Emanuele Organelli², Nathan Briggs³

¹CNRS & Sorbonne Université, OSU Ecce Terra, 4 Place Jussieu, CEDEX 05, 75252 Paris, France.

Sensors (Basel, Switzerland)

|September 28, 2021

Summary

A new quality-control procedure improves the accuracy of underwater light field measurements from the Biogeochemical-Argo program. This method enhances data for ocean optics applications by addressing sensor drift and temperature effects.

Keywords:

BGC-Argo quality control radiometry

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Area of Science:

Oceanography
Optical Oceanography
Remote Sensing

Background:

The Biogeochemical-Argo program collects global underwater light field data.
Existing data quality control has limitations, particularly with sensor performance at depth.

Purpose of the Study:

To develop and validate a quality-control procedure for Argo radiometry data.
To improve the accuracy of underwater light measurements for delayed-mode distribution.

Main Methods:

Proposed a quality-control protocol using 1000 dbar parking depth and night-time profiles.
Tested the procedure on over 10,000 global profiles.
Included ancillary radiometric measurements and error estimation.

Main Results:

Achieved a quality-control success rate exceeding 90% for each spectral band.
Successfully re-qualified low radiometry values across diverse oceanic regions.
Demonstrated the procedure's effectiveness in addressing sensor dark responsiveness and temperature effects.

Conclusions:

The new procedure effectively enhances the quality of Argo radiometry data.
Recommendations for future deployments include daily 1000 dbar measurements and annual night profiles.
Improved data accuracy supports advanced ocean optics applications and biogeochemical studies.