Satlantic’ SeaWiFS Profiling Multichannel Radiometer (SPMR s/n006) and Multichannel Surface reference (SMSR s/n 006). Calibration history report (2001-2011)

Type Report
Date 2013-02
Language English
Ref. The BOUSSOLE project technical reports
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Author(s) Diamond Emilie1, Antoine David1, Vellucci Vincenzo1, Gentili Bernard1, Bécu Guislain1, Scott Alec1
Affiliation(s) 1 : Laboratoire d’Océanographique de Villefranche (LOV) 06238 Villefranche sur mer cedex, FRANCE

Validation of the “geophysical products” derived from observations of satellite ocean colour sensors requires the collection of the same parameters from in situ instrumentation. In particular, the irradiance reflectance or the remote sensing reflectance have to be determined from field measurements of radiometric quantities such as the upward and downward plane irradiances at various depths in the water column. This task has been performed in the frame of the BOUée pour l’acquiSition d’une Série à Long termE (BOUSSOLE) project by using a commercial radiometer system specifically designed for that purpose. This system is built by the Satlantic company (Halifax, Nova Scotia, Canada). It is composed on an in-water profiling radiometer called the “SeaWiFS Profiling Multichannel Radiometer” (SPMR) and a deck reference called the “SeaWiFS Multichannel Surface reference” (SMSR). Deployment procedures and data processing are succinctly presented hereafter. The Satlantic’ SPMR was specifically designed to collect data for validation of the National Aeronautics and Space Administration (NASA) Sea-viewing Wide Field-of-view Sensor (SeaWiFS) ocean color instrument. The SPMR/SMSR system that was built for the remote sensing group of the Laboratoire d’Océanographie de Villefranche (LOV) measures both downward and upward underwater irradiance in 13 spectral channels (Ed(λ) and Eu(λ), respectively), and the above-water downward irradiance in the same 13 channels (Es(λ)). These 13 channels were adapted to the band set of the European Space Agency (ESA) Medium Resolution Imaging Spectrometer (MERIS). The LOV SPMR/SMSR is serial number 006. This system was bought in 1994 and has been used since then, until it was lost at sea during BOUSSOLE cruise 110 in April 2011. It was deployed during a number of oceanographic cruises before being used for BOUSSOLE, and still on a few occasion during the course of the project, from 1996 to 2009 (MINOS in 1996 in the Mediterranean, COASTLOOC in 1996-1997 in European coastal waters, PROSOPE in 1999 in the Mediterranean, POMME in 2000 in the Northeastern Atlantic, BIOSOPE in 2004 in the Southeast Pacific, BATS in 2009 in the Bermuda area, and Plumes & Blooms in 2009 in the Santa Barbara channel). From July 2001 to April 2011, the SPMR/SMSR 006 was essentially used during the monthly BOUSSOLE cruises, during which more than 800 profiles were collected. This report summarizes the calibration history of these instruments. It does not include the description of the data processing that allows derivation of apparent optical properties from the profiles of radiometric quantities.

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Diamond Emilie, Antoine David, Vellucci Vincenzo, Gentili Bernard, Bécu Guislain, Scott Alec (2013). Satlantic’ SeaWiFS Profiling Multichannel Radiometer (SPMR s/n006) and Multichannel Surface reference (SMSR s/n 006). Calibration history report (2001-2011). The BOUSSOLE project technical reports.