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

Lainer, Martin; Hocke, Klemens; Eckert, Ellen; Kämpfer, Niklaus (2019). Significant decline of mesospheric water vapor at the NDACC site near Bern in the period 2007 to 2018. Atmospheric chemistry and physics, 19(9), pp. 6611-6620. European Geosciences Union 10.5194/acp-19-6611-2019

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The middle atmospheric water vapor radiometer MIAWARA is located close to Bern in Zimmerwald (46.88° N, 7.46° E; 907 m) 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 instrument's spectrometer allowed middle atmospheric water vapor to be continuously measured since April 2007. Thenceforward to May 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 multilinear parametric trend model has been used. The trend model encompasses a linear term, a solar activity tracker, the El Niño–Southern Oscillation (ENSO) index and the Quasi-Biennial Oscillation (QBO) as well as the annual and semi-annual oscillation. In the time period April 2007 to May 2018 we find a significant decline in water vapor by −0.6±0.2 ppm per decade between 61 and 72 km. Below the stratopause level (∼48 km) a smaller reduction of H2O of up to −0.3±0.1 ppm per decade is detected.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Lainer, Martin; Hocke, Klemens and Kämpfer, Niklaus

Subjects:

600 Technology > 620 Engineering

ISSN:

1680-7316

Publisher:

European Geosciences Union

Language:

English

Submitter:

Simone Corry

Date Deposited:

19 Jul 2019 09:50

Last Modified:

23 Oct 2019 02:40

Publisher DOI:

10.5194/acp-19-6611-2019

BORIS DOI:

10.7892/boris.131270

URI:

https://boris.unibe.ch/id/eprint/131270

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