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Discussion papers
https://doi.org/10.5194/acp-2018-711
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-711
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Aug 2018

Research article | 13 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Significant decline of mesospheric water vapor at the NDACC site Bern in the period 2007 to 2018

Martin Lainer1, Klemens Hocke1, Ellen Eckert2, and Niklaus Kämpfer1 Martin Lainer et al.
  • 1Institute of Applied Physics, University of Bern, Bern, Switzerland
  • 2University of Toronto, Department of Physics, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada

Abstract. The middle atmospheric water vapor radiometer MIAWARA is located close to Bern in Zimmerwald (46.88°N, 7.46°E, 907m) and is part of the Network for the Detection of Atmospheric Composition Change (NDACC). Initially built in the year 2002, a major upgrade of the instruments spectrometer allowed to continuously measure middle atmospheric water vapor since April 2007. Thenceforward to Mai 2018, a time series of more than 11 years has been gathered, that makes a first trend estimate possible. For the trend estimation, a robust multi-linear parametric trend model has been used. The trend model encompasses a linear term, a solar activity tracker, the El Niño–Southern Oscillation (ENSO) index, the quasi-biennial oscillation (QBO) as well as the annual and semi-annual oscillation. In the time period April 2007 to Mai 2018 we find a significant decline in water vapor by −0.6±0.2ppmdecade−1 between 61 and 72km. Below the stratopause level (~48km) a smaller reduction of H2O of up to −0.3±0.1ppmdecade−1 is detected.

Martin Lainer et al.
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Martin Lainer et al.
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Short summary
A middle atmospheric water vapor time series of more than 11 years (April 2007 to Mai 2018) from the NDACC microwave remote sensing site at Bern (Switzerland) is investigated to estimate the trend by means of a robust multi-linear parametric trend model. Between 61 and 72 km altitude a significant decline in water vapor could be detected. The reduction maximizes to about −12 to −12.5 % per decade.
A middle atmospheric water vapor time series of more than 11 years (April 2007 to Mai 2018) from...
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