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    The Impact of Improved Thermistor Calibration on the Expendable Bathythermograph Profile Data

    Source: Journal of Atmospheric and Oceanic Technology:;2017:;volume( 034 ):;issue: 009::page 1947
    Author:
    Goes, Marlos;Babcock, Elizabeth;Bringas, Francis;Ortner, Peter;Goni, Gustavo
    DOI: 10.1175/JTECH-D-17-0024.1
    Publisher: American Meteorological Society
    Abstract: AbstractExpendable bathythermograph (XBT) data provide one of the longest available records of upper-ocean temperature. However, temperature and depth biases in XBT data adversely affect estimates of long-term trends of ocean heat content and, to a lesser extent, estimates of volume and heat transport in the ocean. Several corrections have been proposed to overcome historical biases in XBT data, which rely on constantly monitoring these biases. This paper provides an analysis of data collected during three recent hydrographic cruises that utilized different types of probes, and examines methods to reduce temperature and depth biases by improving the thermistor calibration and reducing the mass variability of the XBT probes.The results obtained show that the use of individual thermistor calibration in XBT probes is the most effective calibration to decrease the thermal bias, improving the mean thermal bias to less than 0.02°C and its tolerance from 0.1° to 0.03°C. The temperature variance of probes with screened thermistors is significantly reduced by approximately 60% in comparison to standard probes. On the other hand, probes with a tighter weight tolerance did not show statistically significant reductions in the spread of depth biases, possibly because of the small sample size or the sensitivity of the depth accuracy to other causes affecting the analysis.
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      The Impact of Improved Thermistor Calibration on the Expendable Bathythermograph Profile Data

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4245845
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    contributor authorGoes, Marlos;Babcock, Elizabeth;Bringas, Francis;Ortner, Peter;Goni, Gustavo
    date accessioned2018-01-03T10:59:56Z
    date available2018-01-03T10:59:56Z
    date copyright7/10/2017 12:00:00 AM
    date issued2017
    identifier otherjtech-d-17-0024.1.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4245845
    description abstractAbstractExpendable bathythermograph (XBT) data provide one of the longest available records of upper-ocean temperature. However, temperature and depth biases in XBT data adversely affect estimates of long-term trends of ocean heat content and, to a lesser extent, estimates of volume and heat transport in the ocean. Several corrections have been proposed to overcome historical biases in XBT data, which rely on constantly monitoring these biases. This paper provides an analysis of data collected during three recent hydrographic cruises that utilized different types of probes, and examines methods to reduce temperature and depth biases by improving the thermistor calibration and reducing the mass variability of the XBT probes.The results obtained show that the use of individual thermistor calibration in XBT probes is the most effective calibration to decrease the thermal bias, improving the mean thermal bias to less than 0.02°C and its tolerance from 0.1° to 0.03°C. The temperature variance of probes with screened thermistors is significantly reduced by approximately 60% in comparison to standard probes. On the other hand, probes with a tighter weight tolerance did not show statistically significant reductions in the spread of depth biases, possibly because of the small sample size or the sensitivity of the depth accuracy to other causes affecting the analysis.
    publisherAmerican Meteorological Society
    titleThe Impact of Improved Thermistor Calibration on the Expendable Bathythermograph Profile Data
    typeJournal Paper
    journal volume34
    journal issue9
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/JTECH-D-17-0024.1
    journal fristpage1947
    journal lastpage1961
    treeJournal of Atmospheric and Oceanic Technology:;2017:;volume( 034 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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