Postmillennium changes in stratospheric temperature consistently resolved by GPS radio occultation and AMSU observations

Sergey Khaykin 1 Beatriz M. Funatsu 2 Alain Hauchecorne 3 Sophie Godin-Beekmann 3 Chantal Claud 3, 4 Philippe Keckhut 3 Andrea Pazmino 3 Hans Gleisner 5 Johannes K. Nielsen 5 Stig Syndergaard 5 Kent B. Lauritsen 5
1 TROPO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
2 LETG - Nantes - Littoral, Environnement, Télédétection, Géomatique
3 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
4 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
5 DMI - Danish Meteorological Institute
Abstract : Temperature changes in the lower and middle stratosphere during 2001-2016 are evaluated using measurements from GPS Radio Occultation (RO) and Advanced Microwave Sounding Unit (AMSU) aboard the Aqua satellite. After downsampling of GPS-RO profiles according to the AMSU weighting functions, the spatially and seasonally resolved trends from the two data sets are in excellent agreement. The observations indicate that the middle stratosphere has cooled in the time period 2002-2016 at an average rate of –0.14±0.12 to –0.36±0.14 K/decade, while no significant change was found in the lower stratosphere. The meridionally and vertically resolved trends from high-resolution GPS-RO data exhibit a marked inter-hemispheric asymmetry and highlight a distinct boundary between tropospheric and stratospheric temperature change regimes matching the tropical thermal tropopause. The seasonal pattern of trend reveals significant opposite-sign structures at high and low latitudes, providing indication of seasonally varying change in stratospheric circulation.
Keywords : GPS radio occultation AMSU trend stratospheric temperature change
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Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-01566401
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Submitted on : Friday, July 21, 2017 - 8:05:26 AM
Last modification on : Wednesday, January 29, 2020 - 4:47:38 PM

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Sergey Khaykin, Beatriz M. Funatsu, Alain Hauchecorne, Sophie Godin-Beekmann, Chantal Claud, et al.. Postmillennium changes in stratospheric temperature consistently resolved by GPS radio occultation and AMSU observations. Geophysical Research Letters, American Geophysical Union, 2017, 44 (14), pp.7510-7518. ⟨10.1002/2017GL074353⟩. ⟨insu-01566401⟩

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