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The Effect of Natural Multidecadal Ocean Temperature Oscillations on Contiguous U.S. Regional Temperatures

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  • Bruce E Kurtz

Abstract

Atmospheric temperature time series for the nine climate regions of the contiguous U.S. are accurately reproduced by the superposition of oscillatory modes, representing the Atlantic multidecadal oscillation (AMO) and the Pacific decadal oscillation (PDO), on a monotonic mode representing, at least in part, the effect of radiant forcing due to increasing atmospheric CO2. The relative importance of the different modes varies among the nine climate regions, grouping them into three mega-regions: Southeastern comprising the South, Southeast and Ohio Valley; Central comprising the Southwest, Upper Midwest, and Northeast; and Northwestern comprising the West, Northwest, and Northern Rockies & Plains. The defining characteristics of the mega-regions are: Southeastern – dominated by the AMO, no PDO influence; Central – influenced by the AMO, no PDO influence, Northwestern – influenced by both the AMO and PDO. Temperature vs. time curves calculated by combining the separate monotonic and oscillatory modes agree well with the measured temperature time series, indicating that the 1938-1974 small decrease in contiguous U.S. temperature was caused by the superposition of the downward-trending oscillatory mode on the upward-trending monotonic mode while the 1980-2000 large increase in temperature was caused by the superposition of the upward-trending oscillatory mode on the upward-trending monotonic mode. The oscillatory mode, mostly representing the AMO, was responsible for about 72% of the entire contiguous U.S. temperature increase over that time span with the contribution varying from 86 to 42% for individual climate regions.

Suggested Citation

  • Bruce E Kurtz, 2015. "The Effect of Natural Multidecadal Ocean Temperature Oscillations on Contiguous U.S. Regional Temperatures," PLOS ONE, Public Library of Science, vol. 10(6), pages 1-12, June.
    • Handle: RePEc:plo:pone00:0131349
    DOI: 10.1371/journal.pone.0131349
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    References listed on IDEAS

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    1. Mads Faurschou Knudsen & Marit-Solveig Seidenkrantz & Bo Holm Jacobsen & Antoon Kuijpers, 2011. "Tracking the Atlantic Multidecadal Oscillation through the last 8,000 years," Nature Communications, Nature, vol. 2(1), pages 1-8, September.
    2. Diego Macias & Adolf Stips & Elisa Garcia-Gorriz, 2014. "Application of the Singular Spectrum Analysis Technique to Study the Recent Hiatus on the Global Surface Temperature Record," PLOS ONE, Public Library of Science, vol. 9(9), pages 1-7, September.
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