1997–2007 CO trend at the high Alpine site Jungfraujoch: a comparison between NDIR surface in situ and FTIR remote sensing observations
1Belgian Institute for Space Aeronomy, Brussels, Belgium
2Institute for Atmospheric and Climate Science, ETH Zürich, Switzerland
3Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
4Institute of Astrophysics and Geophysics, University of Liège, Liège, Belgium
Abstract. Within the atmospheric research community, there is a strong interest in integrated datasets, combining data from several instrumentations. This integration is complicated by the different characteristics of the datasets, inherent to the measurement techniques. Here we have compared two carbon monoxide time series (1997 till 2007) acquired at the high-Alpine research station Jungfraujoch, with two well-established measurement techniques, namely in situ surface concentration measurements using Non-Dispersive Infrared Absorption technology (NDIR), and ground-based remote sensing measurements using solar absorption Fourier Transform Infrared spectrometry (FTIR). We show that, even if both techniques are able to measure free troposphere CO concentrations, the datasets are influenced by different source regions and therefore are subject to exhibit significant differences in their overall trend behaviour.