Novel design of an enclosed
                        CO&lt;sub&gt;2&lt;/sub&gt;/H&lt;sub&gt;2&lt;/sub&gt;O gas analyser for eddy
                        covariance flux measurements

Burba, George; McDermitt, D. K.; Anderson, D. J.; Furtaw, Michael D.; Eckles, Robert D.

doi:10.1111/j.1600-0889.2010.00468.x

Cited by 47 publications

(59 citation statements)

References 7 publications

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“…However, two different measurement devices were used for H 2 O-and CO 2 -flux measurements (open-path (LI7500, Li-Cor) at the natural site and closed-path (LI7200, Li-Cor) at the drained site), which may lead to a biased site comparison. Based on a study of Burba et al (2010) and Burba et al (2009), CO 2 and latent-heat fluxes measured by LI7500 and LI7200 show a very good agreement. The slope of the linear regression between latent-heat and CO 2 fluxes measured with these two devices for several months is almost one, and the coefficient of determination is better than 0.96.…”

Section: Appendix A: Uncertainty Of the Annual Sumsmentioning

confidence: 86%

“…Generally, ombrotrophic bogs are stronger carbon sinks than more nutrient-rich fens (Byrne et. al., 2004), while intensive land use (e.g., cropland) leads to stronger CO 2 emissions than extensive land use (Byrne et. al., 2004;Drösler et al, 2008).…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

“…inner diameter and a flow rate of 15 L min −1 . The measurement principle of LI7200 is based on the absolute non-dispersiveinfrared (NDIR) design of the LI7500 (Burba et al, 2010), which leads to a good agreement between the two measurement devices. The closed path system has a considerable advantage, because rain drops and fog do not compromise the measurements of the closed-path system, which leads to higher data coverage (see Sect.…”

Section: Instrumentationmentioning

confidence: 99%

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Can a bog drained for forestry be a stronger carbon sink than a natural bog forest?

et al. 2014

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Abstract. This study compares the CO 2 exchange of a natural bog forest, and of a bog drained for forestry in the pre-Alpine region of southern Germany. The sites are separated by only 10 km, they share the same soil formation history and are exposed to the same climate and weather conditions. In contrast, they differ in land use history: at the Schechenfilz site a natural bog-pine forest (Pinus mugo ssp. rotundata) grows on an undisturbed, about 5 m thick peat layer; at Mooseurach a planted spruce forest (Picea abies) grows on drained and degraded peat (3.4 m). The net ecosystem exchange of CO 2 (NEE) at both sites has been investigated for 2 years (July 2010-June 2012), using the eddy covariance technique. Our results indicate that the drained, forested bog at Mooseurach is a much stronger carbon dioxide sink (−130 ± 31 and −300 ± 66 g C m −2 a −1 in the first and second year, respectively) than the natural bog forest at Schechenfilz (−53 ± 28 and −73 ± 38 g C m −2 a −1 ). The strong net CO 2 uptake can be explained by the high gross primary productivity of the 44-year old spruces that overcompensates the two-times stronger ecosystem respiration at the drained site. The larger productivity of the spruces can be clearly attributed to the larger plant area index (PAI) of the spruce site. However, even though current flux measurements indicate strong CO 2 uptake of the drained spruce forest, the site is a strong net CO 2 source when the whole lifecycle since forest planting is considered. It is important to access this result in terms of the long-term biome balance. To do so, we used historical data to estimate the difference between carbon fixation by the spruces and the carbon loss from the peat due to drainage since forest planting. This rough estimate indicates a strong carbon release of +134 t C ha −1 within the last 44 years. Thus, the spruces would need to grow for another 100 years at about the current rate, to compensate the potential peat loss of the former years. In contrast, the natural bog-pine ecosystem has likely been a small but stable carbon sink for decades, which our results suggest is very robust regarding short-term changes of environmental factors.

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Section: Appendix A: Uncertainty Of the Annual Sumsmentioning

confidence: 86%

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Section: Instrumentationmentioning

confidence: 99%

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Can a bog drained for forestry be a stronger carbon sink than a natural bog forest?

et al. 2014

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“…Enclosed-path systems, however, reduce flux attenuation compared to traditional closed-path systems due to shorter tube length (Burba et al, 2010;Novick et al, 2013). Sample screening of cospectra at our two study sites (data not shown) showed that frequency losses for water vapour and sensible heat flux were more pronounced at the wet fen (enclosed-path system) compared to the dry heath (closedpath system).…”

Section: Energy Balance Closure and System Performancementioning

confidence: 99%

Two years with extreme and little snowfall: effects on energy partitioning and surface energy exchange in a high-Arctic tundra ecosystem

et al. 2016

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Abstract. Snow cover is one of the key factors controlling Arctic ecosystem functioning and productivity. In this study we assess the impact of strong variability in snow accumulation during 2 subsequent years (2013-2014) on the landatmosphere interactions and surface energy exchange in two high-Arctic tundra ecosystems (wet fen and dry heath) in Zackenberg, Northeast Greenland. We observed that recordlow snow cover during the winter 2012/2013 resulted in a strong response of the heath ecosystem towards low evaporative capacity and substantial surface heat loss by sensible heat fluxes (H ) during the subsequent snowmelt period and growing season. Above-average snow accumulation during the winter 2013/2014 promoted summertime ground heat fluxes (G) and latent heat fluxes (LE) at the cost of H . At the fen ecosystem a more muted response of LE, H and G was observed in response to the variability in snow accumulation. Overall, the differences in flux partitioning and in the length of the snowmelt periods and growing seasons during the 2 years had a strong impact on the total accumulation of the surface energy balance components. We suggest that in a changing climate with higher temperature and more precipitation the surface energy balance of this high-Arctic tundra ecosystem may experience a further increase in the variability of energy accumulation, partitioning and redistribution.

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“…This water vapor was then released as a pulse into a constant, turbulent flow of artificial air (17 lpm, 80% N 2 , 20% O 2 ), and was transported along a 13.6 m-long tube until it was divided into a 0.5 m-long sampling tube (7 lpm) and a bypass flow. From the sampling tube, the flow was directed into an infrared gas analyzer 22 and a flow-rate gauge, where after it was joined with the bypass flow in a flow module that recorded the flow rate of the whole setup. All tubes before the infrared analyzer had a diameter of 8 mm and were made of polytetrafluoroethylene (PTFE).…”

Section: @C @Smentioning

confidence: 99%

Tube transport of water vapor with condensation and desorption

Nordbo

Kekäläinen

Siivola

et al. 2013

Applied Physics Letters

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Attenuation and delay of active tracers in tube transport is an important current problem, but its full explanation is still lacking. To this end a model is introduced, where part of a tracer undergoes condensation and evaporation, treated as a diffusion-type process, in addition to Taylor dispersion. Condensation of water was verified by high-speed imaging, and the model solution fitted the breakthrough curves of laboratory measurements with pulses of water vapor of varying relative humidity. The model provides a transfer function whose performance was verified against field measurements.

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Novel design of an enclosed CO<sub>2</sub>/H<sub>2</sub>O gas analyser for eddy covariance flux measurements

Cited by 47 publications

References 7 publications

Can a bog drained for forestry be a stronger carbon sink than a natural bog forest?

Can a bog drained for forestry be a stronger carbon sink than a natural bog forest?

Two years with extreme and little snowfall: effects on energy partitioning and surface energy exchange in a high-Arctic tundra ecosystem

Tube transport of water vapor with condensation and desorption

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