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    Evaluation and Recommendations for Improving the Accuracy of an Inexpensive Water Temperature Logger

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    Type
    Article
    Authors
    Lentz, S. J.
    Churchill, J. H.
    Marquette, C.
    Smith, J.
    KAUST Grant Number
    USA 00002
    KSA 00011
    Date
    2013-07
    Permanent link to this record
    http://hdl.handle.net/10754/598243
    
    Metadata
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    Abstract
    Onset's HOBO U22 Water Temp Pros are small, reliable, relatively inexpensive, self-contained temperature loggers that are widely used in studies of oceans, lakes, and streams. An in-house temperature bath calibration of 158 Temp Pros indicated root-mean-square (RMS) errors ranging from 0.01° to 0.14°C, with one value of 0.23°C, consistent with the factory specifications. Application of a quadratic calibration correction substantially reduced the RMS error to less than 0.009°C in all cases. The primary correction was a bias error typically between -0.1° and 0.15°C. Comparison of water temperature measurements from Temp Pros and more accurate temperature loggers during two oceanographic studies indicates that calibrated Temp Pros have an RMSerror of~0.02°C throughout the water column at night and beneath the surface layer influenced by penetrating solar radiation during the day. Larger RMS errors (up to 0.08°C) are observed near the surface during the day due to solar heating of the black Temp Pro housing. Errors due to solar heating are significantly reduced by wrapping the housing with white electrical tape. © 2013 American Meteorological Society.
    Citation
    Lentz SJ, Churchill JH, Marquette C, Smith J (2013) Evaluation and Recommendations for Improving the Accuracy of an Inexpensive Water Temperature Logger. Journal of Atmospheric and Oceanic Technology 30: 1576–1582. Available: http://dx.doi.org/10.1175/JTECH-D-12-00204.1.
    Sponsors
    This work is based on research supported by Awards USA 00002 and KSA 00011 made by King Abdullah University of Science and Technology (KAUST) and by the Ocean Sciences Division of the National Science Foundation under Grant OCE-0548961. The authors appreciate helpful comments and suggestions from Anthony Kirincich and three anonymous reviewers.
    Publisher
    American Meteorological Society
    Journal
    Journal of Atmospheric and Oceanic Technology
    DOI
    10.1175/JTECH-D-12-00204.1
    ae974a485f413a2113503eed53cd6c53
    10.1175/JTECH-D-12-00204.1
    Scopus Count
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