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

Lainer, Martin Lorenz Maximilian; Hocke, Klemens; Eckert, Ellen; Kämpfer, Niklaus (2018). Significant decline of mesospheric water vapor at the NDACC site Bern in the period 2007 to 2018. Atmospheric chemistry and physics Discussions, pp. 1-16. European Geosciences Union 10.5194/acp-2018-711

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Lainer, Martin Lorenz Maximilian; Hocke, Klemens and Kämpfer, Niklaus

Subjects:

600 Technology > 620 Engineering

ISSN:

1680-7375

Publisher:

European Geosciences Union

Language:

English

Submitter:

Franziska Stämpfli

Date Deposited:

22 Oct 2018 10:58

Last Modified:

23 Oct 2019 11:33

Publisher DOI:

10.5194/acp-2018-711

BORIS DOI:

10.7892/boris.120070

URI:

https://boris.unibe.ch/id/eprint/120070

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