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Under what conditions should a user measure TDGP?
A user needs to measure TDGP when the atmospheric pressure is significantly different than the atmospheric pressure at the time of calibration.  This situation arises during extreme weather events and when sampling at elevation.  The largest pressure swings caused by weather are on the order of 3% deviation from standard sea level pressure.  Independent of atmospheric pressure, TDGP in the ocean is primarily controlled by the amount of dissolved oxygen.  Therefore, if oxygen levels at your intended sampling site are anomalous, you are advised to measure TDGP.