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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-494
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
06 Jun 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Two decades of in-situ temperature measurements in the upper troposphere and lowermost stratosphere from IAGOS long-term routine observation
Florian Berkes1, Patrick Neis1, Martin G. Schultz1, Ulrich Bundke1, Susanne Rohs1, Herman G. J. Smit1, Andreas Wahner1, Paul Konopka2, Damien Boulanger3, Philippe Nédélec3, Valerie Thouret3, and Andreas Petzold1 1Forschungszentrum Jülich, IEK-8, Jülich, Germany
2Forschungszentrum Jülich, IEK-7, Jülich, Germany
3Laboratoire d'Aérologie, CNRS and Université de Toulouse, Toulouse, France
Abstract. Despite several studies on temperature trends in the tropopause region, a comprehensive understanding of the evolution of temperatures in this climate-sensitive region of the atmosphere remains elusive. Here we present a unique global-scale, long-term data set of high-resolution in-situ temperature data measured aboard passenger aircraft within the European Research Infrastructure IAGOS (In-service Aircraft for a Global Observing System, www.iagos.org). This data set is used to investigate temperature trends within the global upper troposphere and lowermost stratosphere (UTLS) for the period 1995 to 2012 in different geographical regions and vertical layers of the UTLS. The largest amount of observations is available over the North Atlantic. Here, a neutral temperature trend is found within the lowermost stratosphere. This contradicts the temperature trend in the European Centre for Medium Range Weather Forecast (ECMWF) ERA-Interim reanalysis, where a significant (95 % confidence) temperature increase of +0.56 K/decade is obtained. Differences between trends derived from observations and reanalysis data can be traced back to changes in the temperature bias between observation and model data over the studied period. This study demonstrates the value of the IAGOS temperature observations as anchor point for the evaluation of reanalyses and its suitability for independent trend analyses.

Citation: Berkes, F., Neis, P., Schultz, M. G., Bundke, U., Rohs, S., Smit, H. G. J., Wahner, A., Konopka, P., Boulanger, D., Nédélec, P., Thouret, V., and Petzold, A.: Two decades of in-situ temperature measurements in the upper troposphere and lowermost stratosphere from IAGOS long-term routine observation, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-494, in review, 2017.
Florian Berkes et al.
Florian Berkes et al.
Florian Berkes et al.

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Short summary
This study highlight the importance of independent global measurements with a high and long-term accuracy to quantify long-term changes especially in the UTLS region, and help to identify inconsistencies between different datasets of observations and models. Here we investigated temperature trends over different regions within a climate-senstive of the atmosphere and demonstrated the value of the IAGOS temperature observations as anchor point for the evaluation of reanalyses.
This study highlight the importance of independent global measurements with a high and long-term...
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