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    Revisiting the controversial issue of tropical tropospheric temperature trends


    Mitchell, D.M. and Thorne, Peter and Scott, P.A. and Gray, L.J. (2013) Revisiting the controversial issue of tropical tropospheric temperature trends. Geophysical Research Letters, 40 (11). pp. 2801-2806. ISSN 0094-8276

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    Abstract

    Controversy remains over a discrepancy between modeled and observed tropical upper tropospheric temperature trends. This discrepancy is reassessed using simulations from the Coupled Climate Model Inter-comparison Project phase 5 (CMIP 5) together with radiosonde and surface observations that provide multiple realizations of possible “observed” temperatures given various methods of homogenizing the data. Over the 1979–2008 period, tropical temperature trends are not consistent with observations throughout the depth of the troposphere, and this primarily stems from a poor simulation of the surface temperature trends. This discrepancy is substantially reduced when (1) atmosphere-only simulations are examined or (2) the trends are considered as an amplification of the surface temperature trend with height. Using these approaches, it is shown that within observational uncertainty, the 5–95 percentile range of temperature trends from both coupled-ocean and atmosphere-only models are consistent with the analyzed observations at all but the upper most tropospheric level (150 hPa), and models with ultra-high horizontal resolution (≤ 0.5° × 0.5°) perform particularly well. Other than model resolution, it is hypothesized that this remaining discrepancy could be due to a poor representation of stratospheric ozone or remaining observational uncertainty.

    Item Type: Article
    Keywords: tropical; tropospheric; temperature; trends;
    Academic Unit: Faculty of Social Sciences > Geography
    Item ID: 6480
    Identification Number: https://doi.org/10.1002/grl.50465
    Depositing User: Peter Thorne
    Date Deposited: 20 Oct 2015 09:29
    Journal or Publication Title: Geophysical Research Letters
    Publisher: American Geophysical Union
    Refereed: Yes
    URI:

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