Greenhouse gas observations from Cabauw Tall Tower (1992–2010)
TLDR
In this paper, a semi-continuous in-situ observations of greenhouse gas concentrations have been performed at the tall tower of Cabauw (4.927° E, 51.971° N, −0.7 m a.s.l.).Abstract:
. Since 1992 semi-continuous in-situ observations of greenhouse gas concentrations have been performed at the tall tower of Cabauw (4.927° E, 51.971° N, −0.7 m a.s.l.). Through 1992 up to now, the measurement system has been gradually extended and improved in precision, starting with CO2 and CH4 concentrations from 200 m a.g.l. in 1992 to vertical gradients at 4 levels of the gases CO2, CH4, SF6, N2O, H2, CO and gradients at 2 levels for 222Rn. In this paper the measurement systems and measurement results are described for the main greenhouse gases and CO, for the whole period. The automatic measurement system now provides half-hourly concentration gradients with a precision better than or close to the WMO recommendations. The observations at Cabauw show a complex pattern caused by the influence of sources and sinks from a large area around the tower with significant contributions of sources and sinks at distances up to 500–700 km. The concentration footprint area of Cabauw is one the most intensive and complex source areas of greenhouse gases in the world. Despite this, annual mean trends for the most important greenhouse gases, compatible with the values derived using the global network, can be reproduced from the measured concentrations at Cabauw over the entire measurement period, with a measured increase in the period 2000–2009 for CO2 of 1.90 ± 0.1 ppm yr−1, for CH4 of 4.4 ± 0.6 ppb yr−1, for N2O of 0.86 ± 0.04 ppb yr−1, and for SF6 of 0.27 ± 0.01 ppt yr−1; for CO no significant trend could be detected. The influences of strong local sources and sinks are reflected in the amplitude of the mean seasonal cycles observed at Cabauw, that are larger than the mean Northern Hemisphere average; Cabauw mean seasonal amplitude for CO2 is 25–30 ppm (higher value for lower sampling levels). The observed CH4 seasonal amplitude is 50–110 ppb. All gases except N2O show highest concentrations in winter and lower concentrations in summer, N2O observations show two additional concentration maxima in early summer and in autumn. Seasonal cycles of the day-time mean concentrations show that surface concentrations or high elevation concentrations alone do not give a representative value for the boundary layer concentrations, especially in winter time, but that the vertical profile data along the mast can be used to construct a useful boundary layer mean value. The variability at Cabauw in the atmospheric concentrations of CO2 on time scales of minutes to hours is several ppm and is much larger than the precision of the measurements (0.1 ppm). The diurnal and synoptical variability of the concentrations at Cabauw carry information on the sources and sinks in the footprint area of the mast, that will be useful in combination with inverse atmospheric transport model to verify emission estimates and improve ecosystem models. For this purpose a network of tall tower stations like Cabauw forms a very useful addition to the existing global observing network for greenhouse gases.read more
Citations
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Journal ArticleDOI
CO 2 , CO, and CH 4 measurements from tall towers in the NOAA Earth System Research Laboratory's Global Greenhouse Gas Reference Network: instrumentation, uncertainty analysis, and recommendations for future high-accuracy greenhouse gas monitoring efforts
Arlyn E. Andrews,J. Kofler,J. Kofler,M. Trudeau,M. Trudeau,M. Trudeau,J. C. Williams,D. H. Neff,D. H. Neff,K. A. Masarie,D. Y. Chao,D. Y. Chao,D. R. Kitzis,D. R. Kitzis,Paul C. Novelli,C. L. Zhao,C. L. Zhao,Edward J. Dlugokencky,P. M. Lang,M. Crotwell,M. Crotwell,Marc Fischer,M. J. Parker,J. T. Lee,D. D. Baumann,Ankur R. Desai,Charles O. Stanier,S. F. J. De Wekker,Daniel E. Wolfe,J. W. Munger,Pieter P. Tans +30 more
TL;DR: In this article, a reliable and precise in situ CO2 and CO analysis system has been developed and deployed at eight sites in the NOAA Earth System Research Laboratory's (ESRL) Global Greenhouse Gas Reference Network.
Journal ArticleDOI
A Fourier transform infrared trace gas and isotope analyser for atmospheric applications
David W. T. Griffith,Nicholas M. Deutscher,Nicholas M. Deutscher,Christopher Caldow,Graham Kettlewell,M. Riggenbach,Samuel Hammer +6 more
TL;DR: In this article, an in situ trace gas analyser based on Fourier Transform Infrared (FTIR) spectroscopy was proposed for simultaneous and continuous measurements of carbon dioxide (CO2), methane (CH4), carbon monoxide (CO), nitrous oxide (N2O), and 13C in CO2 in air with high precision.
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Inverse carbon dioxide flux estimates for the Netherlands
A. G. C. A. Meesters,L. F. Tolk,Wouter Peters,Ronald Hutjes,O.S. Vellinga,Jan Elbers,Alex Vermeulen,S. van der Laan,R. E. M. Neubert,Harro A. J. Meijer,A. J. Dolman +10 more
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Journal ArticleDOI
In-situ observations of the isotopic composition of methane at the Cabauw tall tower site
Thomas Röckmann,Simon Eyer,Carina van der Veen,M. E. Popa,Béla Tuzson,Guillaume Monteil,Sander Houweling,Eliza Harris,Dominik Brunner,Hubertus Fischer,G. Zazzeri,David Lowry,Euan G. Nisbet,Willi A. Brand,J. Necki,Lukas Emmenegger,Joachim Mohn +16 more
TL;DR: In this paper, a dual isotope ratio mass spectrometric system (IRMS) and a quantum cascade laser absorption spectroscopy (QCLAS)-based technique for in situ analysis of the isotopic composition of methane under field conditions were deployed at the Cabauw Experimental Site for Atmospheric Research (CESAR).
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Analytical techniques for measuring nitrous oxide
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TL;DR: In the past 50 years, the fraction of CO2 emissions that remains in the atmosphere each year has likely increased, from about 40% to 45%, and models suggest that this trend was caused by a decrease in the uptake of CO 2 by the carbon sinks in response to climate change and variability as mentioned in this paper.
Journal ArticleDOI
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TL;DR: An uptake of CO2 in the southern extratropical ocean less than that estimated from ocean measurements is found, a result that is not sensitive to transport models or methodological approaches, and carbon fluxes integrated over latitudinal zones are strongly constrained by observations in the middle to high latitudes.
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