TY - JOUR T1 - Biogeochemical sensor performance in the SOCCOM profiling float array A1 - Johnson,Kenneth S. A1 - Plant,Joshua N. A1 - Coletti,Luke J. A1 - Jannasch,Hans W. A1 - Sakamoto,Carole M. A1 - Riser,Stephen C. A1 - Swift,Dana D. A1 - Williams,Nancy L. A1 - Boss,Emmanuel A1 - Haentjens,Nils A1 - Talley,Lynne D. A1 - Sarmiento,Jorge L. AD - Monterey Bay Aquarium Res Inst, Moss Landing, CA 95039 USA. AD - Univ Washington, Sch Oceanog, Seattle, WA 98195 USA. AD - Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA. AD - Univ Maine, Sch Marine Sci, Orono, ME USA. AD - Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA. AD - Princeton Univ, Program Atmospher & Ocean Sci, Princeton, NJ 08544 USA. UR - https://archimer.ifremer.fr/doc/00662/77398/ DO - 10.1002/2017JC012838 KW - profiling floats KW - oxygen sensors KW - pH sensors KW - nitrate sensors KW - bio-optical sensors KW - Southern Ocean N2 - The Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) program has begun deploying a large array of biogeochemical sensors on profiling floats in the Southern Ocean. As of February 2016, 86 floats have been deployed. Here the focus is on 56 floats with quality-controlled and adjusted data that have been in the water at least 6 months. The floats carry oxygen, nitrate, pH, chlorophyll fluorescence, and optical backscatter sensors. The raw data generated by these sensors can suffer from inaccurate initial calibrations and from sensor drift over time. Procedures to correct the data are defined. The initial accuracy of the adjusted concentrations is assessed by comparing the corrected data to laboratory measurements made on samples collected by a hydrographic cast with a rosette sampler at the float deployment station. The long-term accuracy of the corrected data is compared to the GLODAPv2 data set whenever a float made a profile within 20 km of a GLODAPv2 station. Based on these assessments, the fleet average oxygen data are accurate to 1 +/- 1%, nitrate to within 0.5 +/- 0.5 mu mol kg(-1), and pH to 0.005 +/- 0.007, where the error limit is 1 standard deviation of the fleet data. The bio-optical measurements of chlorophyll fluorescence and optical backscatter are used to estimate chlorophyll a and particulate organic carbon concentration. The particulate organic carbon concentrations inferred from optical backscatter appear accurate to with 35 mg C m(-3) or 20%, whichever is larger. Factors affecting the accuracy of the estimated chlorophyll a concentrations are evaluated. Y1 - 2017/08 PB - Amer Geophysical Union JF - Journal Of Geophysical Research-oceans SN - 2169-9275 VL - 122 IS - 8 SP - 6416 EP - 6436 ID - 77398 ER -