Lagged response of tropical tropospheric temperature to solar ultraviolet variations on intraseasonal time scales

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Abstract

Correlative and regression analyses of daily ERA-Interim reanalysis data for three separate solar maximum periods confirm the existence of a temperature response to short-term (mainly ∼27 day) solar ultraviolet variations at tropical latitudes in both the lower stratosphere and troposphere. The response, which occurs at a phase lag of 6-10 days after the solar forcing peak, consists of a warming in the lower stratosphere, consistent with relative downwelling and a slowing of the mean meridional (Brewer-Dobson) circulation, and a cooling in the troposphere. The midtropospheric cooling response is most significant in the tropical Pacific, especially under positive El Niño-Southern Oscillation conditions and may be related to a reduction in the number of Madden-Julian oscillation events that propagate eastward into the central Pacific following peaks in short-term solar forcing.

Original languageEnglish (US)
Pages (from-to)4066-4075
Number of pages10
JournalGeophysical Research Letters
Volume43
Issue number8
DOIs
StatePublished - Apr 28 2016

Keywords

  • lower stratosphere
  • solar ultraviolet radiation
  • tropospheric temperature

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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