intercomparison of in situ ndir and column ftir measurements of co2 at jungfraujoch
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2016
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Abstract
We compare two CO2 time series measured at the High Alpine Research
Station Jungfraujoch, Switzerland (3580 m a.s.l.), in the period from 2005 to
2013 with an in situ surface measurement system using a nondispersive infrared analyzer (NDIR) and a ground-based remote sensing system using solar
absorption Fourier transform infrared (FTIR) spectrometry. Although the two
data sets show an absolute shift of about 13 ppm, the slopes of the annual
CO2 increase are in good agreement within their uncertainties. They are
2.04 ± 0.07 and 1.97 ± 0.05 ppm yr−1 for
the FTIR and the NDIR systems, respectively. The seasonality of the FTIR and
the NDIR systems is 4.46 ± 1.11 and 10.10 ± 0.73 ppm,
respectively. The difference is caused by a dampening of the CO2 signal
with increasing altitude due to mixing processes. Whereas the minima of both
data series occur in the middle of August, the maxima of the two data sets
differ by about 10 weeks; the maximum of the FTIR measurements is in the middle
of January, and the maximum of the NDIR measurements is found at the end
of March. Sensitivity analyses revealed that the air masses measured by the
NDIR system at the surface of Jungfraujoch are mainly influenced by central
Europe, whereas the air masses measured by the FTIR system in the column
above Jungfraujoch are influenced by regions as far west as the Caribbean and
the USA.
The correlation between the hourly averaged CO2 values of the NDIR system and the individual FTIR CO2 measurements is 0.820, which is very encouraging given the largely different sampling volumes. Further correlation analyses showed, that the correlation is mainly driven by the annual CO2 increase and to a lesser degree by the seasonality. Both systems are suitable to monitor the long-term CO2 increase, because this signal is represented in the whole atmosphere due to mixing.
The correlation between the hourly averaged CO2 values of the NDIR system and the individual FTIR CO2 measurements is 0.820, which is very encouraging given the largely different sampling volumes. Further correlation analyses showed, that the correlation is mainly driven by the annual CO2 increase and to a lesser degree by the seasonality. Both systems are suitable to monitor the long-term CO2 increase, because this signal is represented in the whole atmosphere due to mixing.
| Reference Key |
schibig2016atmosphericintercomparison
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|---|---|
| Authors | ;M. F. Schibig;M. F. Schibig;E. Mahieu;S. Henne;B. Lejeune;M. C. Leuenberger |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-9935-2016
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| URL | |
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