Measuring system for the long‐term monitoring of biosphere/atmosphere exchange of carbon dioxide

Haszpra, László; Barcza, Zoltán; Bakwin, Peter S.; Berger, Bradford W.; Davis, K. J.; Weidinger, Tamás

doi:10.1029/2000jd900600

Cited by 76 publications

(49 citation statements)

References 56 publications

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“…During this decade, two towers were also established in Europe, Hegyhatsal in Hungary for CO 2 (Haszpra et al, 2001) and Cabauw in the Netherlands for CO 2 and other trace gases (Vermeulen et al, 2006). From the Wisconsin tower, it has been shown that tall towers can have footprints extending over an area of approximately 10 6 km 2 (Gloor et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

In-situ measurements of oxygen, carbon monoxide and greenhouse gases from Ochsenkopf tall tower in Germany

et al. 2009

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In addition to the in-situ measurements, flask samples are taken at Ochsenkopf at approximately weekly intervals and are subsequently analysed for the mixing ratios of the same species, as well as H 2 , and the stable isotopes, δ 13 C, δ 18 O in CO 2 . The in-situ measurements of CO 2 and O 2 from 23 m show substantial diurnal variations that are modulated by biospheric fluxes, combustion of fossil fuels, and by diurnal changes in the planetary boundary layer height. Measurements from 163 m exhibit only very weak diurnal variability, as this height (1185 m a.s.l.) is generally above the nocturnal boundary layer. CH 4 , CO, N 2 O and SF 6 show little diurnal variation even at 23 m owing to the absence of any significant diurnal change in the fluxes and the absence of any strong local sources or sinks. From the in-situ record, the seasonal cycles of the gas species have been characterized and the multi-annual trends determined. Because the record is short, the calculation of the trend is sensitive to inter-annual variations in the amplitudes of the seasonal cycles. However, for CH 4 a significant change in the growth-rate was detected

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Section: Introductionmentioning

confidence: 99%

In-situ measurements of oxygen, carbon monoxide and greenhouse gases from Ochsenkopf tall tower in Germany

et al. 2009

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“…The site can be considered as rural in the industrialized, densely populated Central Europe, as it was shown by SF 6 measurements (Haszpra et al, 2008). A detailed description of the site and instrumentation can be found in Haszpra et al (2001; or at the website of the station (http://nimbus.elte.hu/hhs/).…”

Section: Site Measurement Program and Instrumentationmentioning

confidence: 99%

“…The large-scale flow pattern at the station may only be influenced by the Alps some 100 km to the west. At Hegyhátsál tall tower site carbon dioxide dry mole fraction has been continuously monitored at four elevations (10 m, 48 m, 82 m and 115 m above the ground) since September 1994, using a nondispersive infrared gas analyzer (1994-2007: Li-Cor Model LI-6251, from 2007: Li-Cor Model LI-7000) (Haszpra et al, 2001;. Quality of the measurements is assured by use of standards produced and certified by the World Meteorological Organization Central Calibration Laboratory for CO 2 (WMO CCL) operated by the Earth System Research Laboratory of the National Oceanic and Atmospheric Administration (NOAA ESRL), USA, and by the comparison with co-located NOAA flask air sample measurements (NOAA co-operative air sampling network, site code: HUN -http://www.esrl.noaa.gov/gmd/ccgg/flask.html) (Haszpra et al, 2010), as well as through regular international intercomparisons (Manning et al, 2009).…”

Section: Site Measurement Program and Instrumentationmentioning

confidence: 99%

Variation of CO<sub>2</sub> mole fraction in the lower free troposphere, in the boundary layer and at the surface

et al. 2012

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Abstract. Eight years of occasional flask air sampling and 3 years of frequent in situ measurements of carbon dioxide (CO 2 ) vertical profiles on board of a small aircraft, over a tall tower greenhouse gases monitoring site in Hungary are used for the analysis of the variations of vertical profile of CO 2 mole fraction. Using the airborne vertical profiles and the measurements along the 115 m tall tower it is shown that the measurements at the top of the tower estimate the mean boundary layer CO 2 mole fraction during the mid-afternoon fairly well, with an underestimation of 0.27-0.85 µmol mol −1 in summer, and an overestimation of 0.66-1.83 µmol mol −1 in winter. The seasonal cycle of CO 2 mole fraction is damped with elevation. While the amplitude of the seasonal cycle is 28.5 µmol mol −1 at 10 m above the ground, it is only 10.7 µmol mol −1 in the layer of 2500-3000 m corresponding to the lower free atmosphere above the well-mixed boundary layer. The maximum mole fraction in the layer of 2500-3000 m can be observed around 25 March on average, two weeks ahead of that of the marine boundary layer reference (GLOBALVIEW). By contrast, close to the ground, the maximum CO 2 mole fraction is observed late December, early January. The specific seasonal behavior is attributed to the climatology of vertical mixing of the atmosphere in the Carpathian Basin.

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“…Measurements of CO 2 mixing ratio profiles, temperature, humidity, and wind profiles began in September 1994 (Haszpra et al 2001). Flux measurements began in April 1997.…”

Section: Monitoring Sitesmentioning

confidence: 99%

“…The system is designed for the continuous, unattended monitoring of CO 2 mixing ratio in the near surface atmosphere based on an infrared gas analyzer (IRGA) with a setup that is very similar to that described by Zhao et al (1997), and used for the measurements reported by Bakwin et al (1995Bakwin et al ( , 1998 and Haszpra et al (2001Haszpra et al ( , 2008 (Figure 2). At the station an ATOMKI type (described above) atmospheric CO 2 sampling unit was also installed.…”

Section: The Developed Field-deployable Co 2 Measuring Systemmentioning

confidence: 99%

Atmospheric Fossil Fuel CO₂ Measurement Using a Field Unit in a Central European City During the Winter of 2008/09

et al. 2010

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ABSTRACT.A high-precision atmospheric CO 2 monitoring station was developed as a field unit. Within this, an integrating CO 2 sampling system was applied to collect samples for radiocarbon measurements. One sampler was installed in the second largest city of Hungary (Debrecen station) and 2 independent 14 CO 2 sampling lines were installed ~300 km from Debrecen in a rural site at Hegyhátsál station as independent background references, where high-precision atmospheric CO 2 mixing ratios have been measured since 1994. Fossil fuel CO 2 content in the air of the large Hungarian city of Debrecen was determined during the winter of 2008 using both the measurements of CO 2 mixing ratio and 14 C content of air. Fossil fuel CO 2 was significantly enhanced at Debrecen relative to the clean-air site at Hegyhátsál.

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Measuring system for the long‐term monitoring of biosphere/atmosphere exchange of carbon dioxide

Abstract: Abstract.We

Cited by 76 publications

References 56 publications

In-situ measurements of oxygen, carbon monoxide and greenhouse gases from Ochsenkopf tall tower in Germany

In-situ measurements of oxygen, carbon monoxide and greenhouse gases from Ochsenkopf tall tower in Germany

Variation of CO<sub>2</sub> mole fraction in the lower free troposphere, in the boundary layer and at the surface

Atmospheric Fossil Fuel CO₂ Measurement Using a Field Unit in a Central European City During the Winter of 2008/09

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Measuring system for the long‐term monitoring of biosphere/atmosphere exchange of carbon dioxide

Abstract: Abstract.We

Cited by 76 publications

References 56 publications

In-situ measurements of oxygen, carbon monoxide and greenhouse gases from Ochsenkopf tall tower in Germany

In-situ measurements of oxygen, carbon monoxide and greenhouse gases from Ochsenkopf tall tower in Germany

Variation of CO&lt;sub&gt;2&lt;/sub&gt; mole fraction in the lower free troposphere, in the boundary layer and at the surface

Atmospheric Fossil Fuel CO2 Measurement Using a Field Unit in a Central European City During the Winter of 2008/09

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Product

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About

Variation of CO<sub>2</sub> mole fraction in the lower free troposphere, in the boundary layer and at the surface

Atmospheric Fossil Fuel CO₂ Measurement Using a Field Unit in a Central European City During the Winter of 2008/09