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| Titel |
Continuous low-maintenance CO2/CH4/H2O measurements at the Zotino Tall Tower Observatory (ZOTTO) in Central Siberia |
| VerfasserIn |
J. Winderlich, H. Chen, C. Gerbig, T. Seifert, O. Kolle, J. V. Lavrič, C. Kaiser, A. Höfer, M. Heimann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 4 ; Nr. 3, no. 4 (2010-08-24), S.1113-1128 |
| Datensatznummer |
250001224
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| Publikation (Nr.) |
 copernicus.org/amt-3-1113-2010.pdf |
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| Zusammenfassung |
| To monitor the continental carbon cycle, a fully automated low maintenance
measurement system is installed at the Zotino Tall Tower Observatory in
Central Siberia (ZOTTO, 60°48' N, 89°21' E) since April 2009. A
cavity ring-down spectroscopy (CRDS) analyzer continuously measures carbon
dioxide (CO2) and methane (CH4) from six heights up to 301 m a.g.l. Buffer volumes in each air line remove short term CO2 and
CH4 mixing ratio fluctuations associated with turbulence, and allow
continuous, near-concurrent measurements from all tower levels. Instead of
drying the air sample, the simultaneously measured water vapor is used to
correct the dilution and pressure-broadening effects for the accurate
determination of dry air CO2 and CH4 mixing ratios. The stability
of the water vapor correction was demonstrated by repeated laboratory and
field tests. The effect of molecular adsorption in the wet air lines was
shown to be negligible. The low consumption of four calibration tanks that
need recalibration only on decadal timescale further reduces maintenance.
The measurement precision (accuracy) of 0.04 ppm (0.09 ppm) for CO2 and
0.3 ppb (1.5 ppb) for CH4 is compliant with the WMO recommendations.
The data collected so far (until April 2010) reveals a seasonal cycle
amplitude for CO2 of 30.4 ppm at the 301 m level. |
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