期刊
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
卷 32, 期 8, 页码 1536-1543出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JTECH-D-14-00162.1
关键词
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资金
- E-AIMS (EU FP7 Project) [312642]
- EUERC [246777]
- O2-Floats [KO 1717/3-1]
- German Science Foundation (DFG) [SFB754]
- European Research Council (ERC) [246777] Funding Source: European Research Council (ERC)
A yet unexplained drift of (some) oxygen optodes during storage/transport and thus significant deviations from factory/laboratory calibrations have been a major handicap for autonomous oxygen observations. Optode drift appears to be systematic and is predominantly a slope effect due to reduced oxygen sensitivity. A small contribution comes from a reduced luminophore lifetime, which causes a small positive offset. A reliable in situ reference is essential to correct such a drift. Traditionally, this called for a ship-based reference cast, which poses some challenges for opportunistic float deployments. This study presents an easily implemented alternative using near-surface/in-air measurements of an Aanderaa optode on a 10-cm stalk and compares it to the more traditional approaches (factory, laboratory, and in situ deployment calibration). In-air samples show a systematic bias depending on the water saturation, which is likely caused by occasional submersions of the standard-height stalk optode. Linear regression of measured in-air supersaturation against in-water supersaturation (using ancillary meteorological data to define the saturation level) robustly removes this bias and thus provides a precise (0.2%) and accurate (1%) in situ correction that is available throughout the entire instrument's lifetime.
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