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    Temperature error in digital bathythermograph data

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    I_J_Mar_Sci_32_234.pdf (126.4Kb)
    Date
    2003
    Author
    Pankajakshan, T.
    Reddy, G.V.
    Ratnakaran, L.
    Sarupria, J.S.
    RameshBabu, V.
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    Abstract
    Simultaneous Digital Bathythermograph (DBT) and Nansen Cast data collected during two cruises of R.V. Gaveshani (GV-117 and GV-118) and archived in Indian Oceanographic Data Centre (IODC) are used to determine existing temperature errors in DBT. The resulting mean error for DBT data from the GV-117 cruise varies from -0.5 to -1 degrees C, while it varied between -0.3 and -0.6 degrees C for data from cruise GV-118. For both the data sets, the error shows consistently negative bias from surface to 800 m depth, however there is no apparent or measurable systematic dependence of the error on depth. Considering the given temperature accuracy of 0.05 degrees C, the observed DBT error, varying from -0.3 to -1 degrees C, is significant and such offsets should be removed from DBT archives. It is found that a corrective measure of +0.5 degrees C, equivalent to the mean surface offset obtained from two cruises, can considerably reduce the temperature error at all DBT depths.
    URI
    http://drs.nio.org/drs/handle/2264/413
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