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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 7
Atmos. Chem. Phys., 10, 3427-3442, 2010
https://doi.org/10.5194/acp-10-3427-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 10, 3427-3442, 2010
https://doi.org/10.5194/acp-10-3427-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Apr 2010

14 Apr 2010

The ground-based FTIR network's potential for investigating the atmospheric water cycle

M. Schneider1, K. Yoshimura2,*, F. Hase1, and T. Blumenstock1 M. Schneider et al.
  • 1Karlsruhe Institute of Technology (KIT), IMK-ASF, Karlsruhe, Germany
  • 2Scripps Institution of Oceanography, University of California, San Diego, USA
  • *now at: Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan

Abstract. We present tropospheric H216O and HD16O/H216O vapour profiles measured by ground-based FTIR (Fourier Transform Infrared) spectrometers between 1996 and 2008 at a northern hemispheric subarctic and subtropical site (Kiruna, Northern Sweden, 68° N and Izaña, Tenerife Island, 28° N, respectively). We compare these measurements to an isotope incorporated atmospheric general circulation model (AGCM). If the model is nudged towards meteorological fields of reanalysis data the agreement is very satisfactory on time scales ranging from daily to inter-annual. Taking the Izaña and Kiruna measurements as an example we document the FTIR network's unique potential for investigating the atmospheric water cycle. At the subarctic site we find strong correlations between the FTIR data, on the one hand, and the Arctic Oscillation index and the northern Atlantic sea surface temperature, on the other hand. The Izaña FTIR measurements reveal the importance of the Hadley circulation and the Northern Atlantic Oscillation index for the subtropical middle/upper tropospheric water balance. We document where the AGCM is able to capture these complexities of the water cycle and where it fails.

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