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Improved shadow correction for the marine optical buoy, MOBY.

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    A new 3-D instrument self-shading correction improves measurements from the Marine Optical Buoy (MOBY). This correction is crucial for accurate upwelling radiance data, especially during specific solar alignments.

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    Area of Science:

    • Oceanography
    • Optical Oceanography
    • Instrument Calibration

    Background:

    • Accurate measurement of upwelling radiance is essential for ocean color remote sensing.
    • The Marine Optical Buoy (MOBY) system provides long-term, in-situ optical measurements.
    • Instrument self-shading can introduce errors in radiance measurements.

    Purpose of the Study:

    • To develop and validate a 3-D instrument self-shading correction for MOBY upwelling radiance measurements.
    • To assess the impact of the correction on a 23-year data record.
    • To quantify the uncertainty associated with the self-shading correction.

    Main Methods:

    • Development of a 3-D self-shading correction algorithm.
    • Application and testing of the correction using a 23-year MOBY time series dataset.
    • Monte Carlo simulations to estimate correction uncertainty based on parameter variations.

    Main Results:

    • The 3-D correction is generally small (<2%), but significant under specific sun-collector alignments.
    • Correction uncertainty is typically <1%, but can reach 30% in regions of strong self-shading.
    • The correction was successfully applied to a long-term MOBY dataset.

    Conclusions:

    • The developed 3-D correction effectively addresses MOBY instrument self-shading.
    • The correction improves the accuracy of upwelling radiance data, particularly during challenging geometric conditions.
    • Understanding and quantifying correction uncertainty is vital for robust oceanographic data analysis.