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    Reassessing changes in diurnal temperature range: A new data set and characterization of data biases


    Thorne, Peter and Menne, M.J. and Williams Jr., C.N. and Rennie, J.J. and Lawrimore, Jay and Vose, R.S. and Peterson, Thomas C. and Durre, I. and Davy, R. and Esau, I. and Klein-Tank, A.M.G. and Merlone, A. (2016) Reassessing changes in diurnal temperature range: A new data set and characterization of data biases. Journal of Geophysical Research: Atmospheres, 121. pp. 5115-5135. ISSN 2169-8996

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    Abstract

    It has been a decade since changes in diurnal temperature range (DTR) globally have been assessed in a stand-alone data analysis. The present study takes advantage of substantively improved basic data holdings arising from the International Surface Temperature Initiative’s databank effort and applies the National Centers for Environmental Information’s automated pairwise homogeneity assessment algorithm to reassess DTR records. It is found that breakpoints are more prevalent in DTR than other temperature elements and that the resulting adjustments have a broader distribution. This strongly implies that there is an overarching tendency, across the global meteorological networks, for nonclimatic artifacts to impart either random or anticorrelated rather than correlated biases in maximum and minimum temperature series. Future homogenization efforts would likely benefit from simultaneous consideration of DTR and maximum and minimum temperatures, in addition to average temperatures. Estimates of change in DTR are relatively insensitive to whether adjustments are calculated directly or inferred from adjustments returned for the maximum and minimum temperature series. The homogenized series exhibit a reduction in DTR since the midtwentieth century globally (-0.044 K/decade). Adjustments serve to approximately halve the long-term global reduction in DTR in the basic “raw” data. Most of the estimated DTR reduction occurred over 1960–1980. In several regions DTR has apparently increased over 1979–2012, while globally it has exhibited very little change (-0.016 K/decade). Estimated changes in DTR are an order of magnitude smaller than in maximum and minimum temperatures, which have both been increasing rapidly on multidecadal timescales (0.186 K/decade and 0.236 K/decade, respectively, since the midtwentieth century).

    Item Type: Article
    Keywords: diurnal temperature range; homogeneity; trends;
    Academic Unit: Faculty of Social Sciences > Geography
    Faculty of Social Sciences > Research Institutes > Irish Climate Analysis and Research Units, ICARUS
    Item ID: 8966
    Identification Number: https://doi.org/10.1002/2015JD024583
    Depositing User: Peter Thorne
    Date Deposited: 07 Nov 2017 14:46
    Journal or Publication Title: Journal of Geophysical Research: Atmospheres
    Publisher: American Geophysical Union (AGU)
    Refereed: Yes
    URI:

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