The ground-based FTIR network's potential for investigating the atmospheric water cycle 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
Received: 26 November 2009 – Published in Atmos. Chem. Phys. Discuss.: 09 December 2009 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.
Revised: 27 March 2010 – Accepted: 06 April 2010 – Published: 14 April 2010
Citation: Schneider, M., Yoshimura, K., Hase, F., and Blumenstock, T.: The ground-based FTIR network's potential for investigating the atmospheric water cycle, Atmos. Chem. Phys., 10, 3427-3442, doi:10.5194/acp-10-3427-2010, 2010.