A portable, low-cost relaxed eddy accumulation (REA) system for quantifying ecosystem-level fluxes of volatile organics

Sarkar, Chinmoy; Turnipseed, Andrew A.; Shertz, Stephen; Karl, T.; Potosnak, Mark J.; Bai, J. M.; Serça, D.; Bonal, Damien; Burban, Benoît; Lopes, Paula Regina Corain; Vega, Oscar

doi:10.1016/j.atmosenv.2020.117764

Cited by 8 publications

(4 citation statements)

References 59 publications

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“…The flux measurements are currently rare due to the expense and the measurements that focus on drought and heatwave are difficult to obtain. Relaxed eddy accumulation technique (Ciccioli et al., 2003 ; Sarkar et al., 2020 ) combined with a gas chromatograph with photoionization detection (Bolas et al., 2020 ) is an example of a lower‐cost alternative for isoprene flux measurements and create more data for model validation and improvement. Besides having more in‐situ ground observations, the existing and future airborne observations and satellite products could also provide an opportunity to further investigate and understand the impact of environmental stress on BVOC emission.…”

Section: Resultsmentioning

confidence: 99%

Modeling Isoprene Emission Response to Drought and Heatwaves Within MEGAN Using Evapotranspiration Data and by Coupling With the Community Land Model

Wang

Seco

et al. 2022

J Adv Model Earth Syst

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Isoprene plays a significant role in tropospheric chemistry due to the large amount of emission and its high chemical reactivity. It is the major species of Biogenic Volatile Organic Compounds (BVOCs) emitted from terrestrial vegetation and accounts for half of global BVOC emission (Guenther et al., 2012). Isoprene is an important precursor of ozone and secondary organic aerosol (SOA) (Claeys et al., 2004;Sillman, 1999), so accurately estimating isoprene emission is required to understand the ozone and SOA relevant chemical and physical processes for improving air quality and managing their climatic impact.The emission of isoprene is affected by multiple environmental factors like light condition and temperature (

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Section: Resultsmentioning

confidence: 99%

Modeling Isoprene Emission Response to Drought and Heatwaves Within MEGAN Using Evapotranspiration Data and by Coupling With the Community Land Model

Wang

Seco

et al. 2022

J Adv Model Earth Syst

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“…For atmospheric REA, the angles are often computed once, after the anemometer is fixed on a "flux tower" (Pattey et al, 1993). Sarkar et al (2020), who used portable atmospheric REA equipment, determined the angles at the beginning of each campaign from a velocity measurement period without air sampling, then used for each flux averaging period the angles computed from the velocities measured during the previous one. But during the development phase of our prototype, we alternated between velocity measurement periods without sampling, later called "prototype alignment periods," and flux averaging periods of the same duration.…”

Section: Reorientation Of the Coordinate Systemmentioning

confidence: 99%

A New Technique for Resolving Benthic Solute Fluxes: Evaluation of Conditional Sampling Using Aquatic Relaxed Eddy Accumulation

Calabro‐Souza,

Lorke,

Noss

et al. 2023

Earth and Space Science

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Solute exchange between the sediment and the water column strongly influences water quality in aquatic ecosystems. Among the techniques available for in situ observation, only aquatic eddy covariance (AEC) can resolve the hourly dynamics of benthic fluxes, but only for few substances like oxygen. In micrometeorology, relaxed eddy accumulation (REA), a technique based on high‐frequency sampling conditioned by current direction, overcomes this limitation. We developed a portable prototype instrumentation platform to transfer REA to the sediment‐water interface of shallow aquatic ecosystems. In order to evaluate the sampling system, we configured the prototype for measuring oxygen fluxes and comparing them to simultaneous AEC measurements. In a river and two artificial lakes, at depths 1–3 m and 0.2 m above the sediment, we measured 15 oxygen flux pairs in fully developed turbulence during 8–15 min periods, ranging from −150 to 50 mmol m−2 day−1. The good agreement between REA and AEC fluxes (R2 = 0.94) shows the reliability of the conditional sampling system. REA represents a promising technique for exploring the sediment contribution to biogeochemical cycles in aquatic ecosystems.

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“…In common with the system described in Hornsby et al (2009) and our system uses separate sample lines, which reduces the risk of mixing updraft and downdraft air during low dead-band velocity limits. Only few studies so far have calculated or discussed the limit of detection for the REA system by taking into account the variability of σw (e.g., Hornsby et al, 2009, Sarkar et al, 2020. Here we proposed a simple method based on Monte Carlo simulations and the analyser's precision to calculate the system's detection limits in relation to σ w .…”

Section: Introductionmentioning

confidence: 99%

Greenhouse gas fluxes from drained peatland : Measurement techniques and management impacts

Keck

2023

Acta Universitatis Agriculturae Sueciae

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Agricultural use of drained peatlands has significant implications for national greenhouse gas (GHG) emission inventories. Once drained, peatlands emit large amounts of carbon dioxide (CO2), may become small methane (CH4) sinks and, with nitrogen fertilisation, may emit large quantities of nitrous oxide (N2O). Studies on the influence of set-aside cropland in reducing GHG emissions from peatlands are rare, measurement techniques for continuous long-term observations are costly and detection of small fluxes is critical. This thesis investigated management effects on GHG fluxes from a cropland (CL) and an adjacent set-aside (SA) grassland on peat. An affordable relaxed eddy accumulation (REA) system for measuring continuous fluxes of CO2, N2O, CH4, and water vapour (H2O) was designed and tested. A convenient method for optimising chamber flux measurement duration and number of concentrations was developed and tested against experimental data. The SA site showed higher annual CO2 emissions than the CL site (0.41 and 0.16 kg CO2 m-2 yr1 , respectively). Nitrous oxide and CH4 emissions had a minor influence on the climate effect at both sides. The REA system reliably measured GHG fluxes over complete growing seasons, based on a comparison of CO2 and H2O fluxes with an eddy covariance system. The chamber optimisation method yielded similar results to experimental data, and can be valuable in the planning phase of measurement campaigns. In conclusion, this thesis found no evidence that setting-aside agricultural land on peat reduced GHG emissions and emphasises the importance of affordable and reliable measuring equipment.

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A portable, low-cost relaxed eddy accumulation (REA) system for quantifying ecosystem-level fluxes of volatile organics

Cited by 8 publications

References 59 publications

Modeling Isoprene Emission Response to Drought and Heatwaves Within MEGAN Using Evapotranspiration Data and by Coupling With the Community Land Model

Modeling Isoprene Emission Response to Drought and Heatwaves Within MEGAN Using Evapotranspiration Data and by Coupling With the Community Land Model

A New Technique for Resolving Benthic Solute Fluxes: Evaluation of Conditional Sampling Using Aquatic Relaxed Eddy Accumulation

Greenhouse gas fluxes from drained peatland : Measurement techniques and management impacts

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