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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 33, issue 3 | Copyright
Ann. Geophys., 33, 363-369, 2015
https://doi.org/10.5194/angeo-33-363-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

ANGEO Communicates 19 Mar 2015

ANGEO Communicates | 19 Mar 2015

Long-term midlatitude mesopause region temperature trend deduced from quarter century (1990–2014) Na lidar observations

C.-Y. She1,2, D. A. Krueger1, and T. Yuan2 C.-Y. She et al.
  • 1Physics Department, Colorado State University, Fort Collins, CO 80523, USA
  • 2Center for Atmospheric and Space Sciences, Utah State University, Logan, UT 84322, USA

Abstract. The long-term midlatitude temperature trend between 85 and 105 km is deduced from 25 years (March 1990–December 2014) of Na Lidar observations. With a strong warming episode in the 1990s, the time series was least-square fitted to an 11-parameter nonlinear function. This yields a cooling trend starting from an insignificant value of 0.64 ± 0.99 K decade−1 at 85 km, increasing to a maximum of 2.8 ± 0.58 K decade−1 between 91 and 93 km, and then decreasing to a warming trend above 103 km. The geographic altitude dependence of the trend is in general agreement with model predictions. To shed light on the nature of the warming episode, we show that the recently reported prolonged global surface temperature cooling after the Mt Pinatubo eruption can also be very well represented by the same response function.

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The unique, quarter-century-long Na lidar observations of midlatitude mesopause region temperatures are used to yield a cooling trend starting from an insignificant value of 0.64K/decade at 85km, increasing to a maximum of 2.8K/decade between 91 and 93km, and then decreasing to a warming trend above 103km. The long warming episode observed in the 1990s is found to mirror that of the global surface cooling after the Mt Pinatubo eruption.
The unique, quarter-century-long Na lidar observations of midlatitude mesopause region...
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