Evaluation of a micrometeorological mass balance method employing an open-path laser for measuring methane emissions

Desjardins, Raymond L.; Denmead, O. T.; Harper, Lowry A.; McBain, Matthew C.; Massé, Daniel I.; Kaharabata, S. K.

doi:10.1016/j.atmosenv.2004.09.008

Cited by 43 publications

(22 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whilst there are many studies in the literature that use this approach (e.g. Desjardins et al 2004;Park et al, 2006) none were identified for this review that related to the use of feed additives.…”

Section: Methodological Approachesmentioning

confidence: 99%

“…The accuracy depends on atmospheric conditions and it also measures emissions from a large group of animals and so is not useful for evaluating differences in diets and treatments. Research conducted by Desjardins et al (2004) also identified a tendency of the technique to overestimate emissions and that the minimum animal sample size was 10. None of the studies identified for consideration in this project used these types of approaches.…”

Section: Methodological Approaches For Evaluating Feed Additives Thatmentioning

confidence: 99%

“…Desjardins et al, 2004;Lassey et al, 2000;Lassey et al, 1997, Judd et al, 1999. There are considerable disadvantages with this approach, cost being one.…”

Section: Methodological Approaches For Evaluating Feed Additives Thatmentioning

confidence: 99%

See 2 more Smart Citations

Review of substances/agents that have direct beneficial effect on the environment: mode of action and assessment of efficacy

Lewis

Tzilivakis

Green

et al. 2013

EFSA Supporting Publications

View full text Add to dashboard Cite

Some substances and agents, used as livestock feed additives, could have an important role to play in delivering sustainable increases in productivity and simultaneous reductions in damaging pollutants. This research project aimed to identify livestock feed additives which may have potential benefits for the environment and create an inventory of these which included other relevant scientific and descriptive data. This is the final report of the project. It provides a detailed description of the methodology used and the research findings.The project considered over 620 scientific publications, reports and other documents which led to data for around 300 studies and 246 substances and agents with potential to be used as feed additives to be reviewed. Of the 246 substances and agents explored, 130 were found to offer potential benefits to the environment and, for some substances, the benefits could be very significant. In addition to data on efficacy the study also considered scientific methodologies, analytical approaches and statistical techniques used within the studies. The project also collated data relating to the physicochemical properties, and human and wildlife toxicity for each of the 130 substances and agents.© University of Hertfordshire, 2013 KEY WORDSEnvironment, feed additives, livestock, emissions DISCLAIMERThe present document has been produced and adopted by the bodies identified above as author(s). This task has been carried out exclusively by the author(s) in the context of a contract between the European Food Safety Authority and the author(s), awarded following a tender procedure. The present document is published complying with the transparency principle to which the Authority is subject. It may not be considered as an output adopted by the Authority. The European food Safety Authority reserves its rights, view and position as regards the issues addressed and the conclusions reached in the present document, without prejudice to the rights of the authors. The present document has been produced and adopted by the bodies identified above as author(s). This task has been carried out exclusively by the author(s) in the context of a contract between the European Food Safety Authority and the author(s), awarded following a tender procedure. The present document is published complying with the transparency principle to which the Authority is subject. It may not be considered as an output adopted by the Authority. The European Food Safety Authority reserves its rights, view and position as regards the issues addressed and the conclusions reached in the present document, without prejudice to the rights of the authors. SUMMARYSome substances and agents, used as livestock feed additives, could have an important role to play in delivering sustainable increases in productivity and simultaneous reductions in damaging pollutants. This research project aimed to identify livestock feed additives which may have potential benefits for the environment and create an inventory of these which includes other...

show abstract

Section: Methodological Approachesmentioning

confidence: 99%

Section: Methodological Approaches For Evaluating Feed Additives Thatmentioning

confidence: 99%

See 1 more Smart Citation

Review of substances/agents that have direct beneficial effect on the environment: mode of action and assessment of efficacy

Lewis

Tzilivakis

Green

et al. 2013

EFSA Supporting Publications

View full text Add to dashboard Cite

show abstract

“…• Aircraft-based fluxes of N 2 O, CO 2 , and CH 4 from farms at a regional scale (e.g., Desjardins et al 2000). …”

Section: Evaluating the Virtual Farmmentioning

confidence: 99%

A proposed approach to estimate and reduce net greenhouse gas emissions from whole farms

Janzen¹,

Angers²,

Boehm³

et al. 2006

Can. J. Soil. Sci.

Self Cite

View full text Add to dashboard Cite

. 2006. A proposed approach to estimate and reduce net greenhouse gas emissions from whole farms. Can. J. Soil Sci. 86: 401-418. Greenhouse gas emissions from farms can be suppressed in two ways: by curtailing the release of these gases (especially N 2 O and CH 4 ), and by storing more carbon in soils, thereby removing atmospheric CO 2 . But most practices have multiple interactive effects on emissions throughout a farm. We describe an approach for identifying practices that best reduce net, wholefarm emissions. We propose to develop a "Virtual Farm", a series of interconnected algorithms that predict net emissions from flows of carbon, nitrogen, and energy. The Virtual Farm would consist of three elements: descriptors, which characterize the farm; algorithms, which calculate emissions from components of the farm; and an integrator, which links the algorithms to each other and the descriptors, generating whole-farm estimates. Ideally, the Virtual Farm will be: boundary-explicit, with single farms as the fundamental unit; adaptable to diverse farm types; modular in design; simple and transparent; dependent on minimal, attainable inputs; internally consistent; compatible with models developed elsewhere; and dynamic ("seeing" into the past and the future). The Virtual Farm would be constructed via two parallel streams -measurement and modeling -conducted iteratively. The understanding built into the Virtual Farm may eventually be applied to issues beyond greenhouse gas mitigation. [401][402][403][404][405][406][407][408][409][410][411][412][413][414][415][416][417][418]. La réduction des émissions de gaz à effet de serre (GES) des exploitations agricoles peut être obtenue de deux façons : en restreignant la libération des GES (en particulier le N20 et le CH4) et en stockant dans le sol plus de carbone provenant du CO 2 atmosphérique. Malheureusement, bon nombre de pratiques agricoles ont des interactions multiples qui agissent simultanément sur l'ensemble des émissions de l'exploitation agricole. Les auteurs décrivent une approche pour identifier les pratiques agricoles permettant d'atteindre la meilleure réduction nette possible des émissions de GES de l'exploitation. Ils proposent la création d'une « ferme virtuelle », qui sera en fait une série d'algorithmes reliés entre eux qui prédiront les émissions nettes de flux de carbone, d'azote et d'énergie. A priori, la Ferme virtuelle comprendra trois éléments : des descripteurs de l'exploitation agricole, des algorithmes calculant les émissions des composantes de l'exploitation et un intégrateur reliant les algorithmes entre eux ainsi qu'aux descripteurs qui produira des estimations de GES pour l'exploitation entière. Idéalement, la Ferme virtuelle devrait inclure des limites explicites, son unité fondamentale étant l'exploitation individuelle; elle devrait pouvoir décrire divers types d'exploitation, être modulaire, simple et transparente, ne requérir qu'un nombre limité de données d'entrée facilement accessibles, être cohérente en soi, compatible avec les modèles ...

show abstract

“…Tunable diode laser absorption spectroscopy (TDLAS) CH 4 sensors with near-infrared sources have also been developed for laser scanning applications to detect natural gas leakage (Gibson et al 2006;Xia et al 2008) and to measure fugitive emission fluxes (Thoma et al 2005). TDLAS systems such as the GasFinder MC (Boreal Laser Inc.) have shown ;1 ppbv CH 4 precision under laboratory conditions at 1-km round-trip pathlength and have been deployed in the field to measure agricultural CH 4 emissions (Desjardins et al 2004). Xia et al (2008) demonstrated diode laser-based CH 4 detection at a minimum detection limit of 1.1 ppm m 21 with a 120-m optical pathlength but did not address in situ instrument drift.…”

Section: Introductionmentioning

confidence: 99%

Long-Path Quantum Cascade Laser–Based Sensor for Methane Measurements

Michel

Miller

Sun

et al. 2016

Journal of Atmospheric and Oceanic Technology

View full text Add to dashboard Cite

A long-path methane (CH 4 ) sensor was developed and field deployed using an 8-mm quantum cascade laser. The high optical power (40 mW) of the laser allowed for path-integrated measurements of ambient CH 4 at total pathlengths from 100 to 1200 m with the use of a retroreflector. Wavelength modulation spectroscopy was used to make high-precision measurements of atmospheric pressure-broadened CH 4 absorption over these long distances. An in-line reference cell with higher harmonic detection provided metrics of system stability in rapidly changing and harsh environments. The system consumed less than 100 W of power and required no consumables. The measurements intercompared favorably (typically less than 5% difference) with a commercial in situ methane sensor when accounting for the different spatiotemporal scales of the measurements. The sensor was field deployed for 2 weeks at an arctic lake to examine the robustness of the approach in harsh field environments. Shortterm precision over a 458-m pathlength was 10 ppbv at 1 Hz, equivalent to a signal from a methane enhancement above background of 5 ppmv in a 1-m length. The sensor performed well in a range of harsh environmental conditions, including snow, rain, wind, and changing temperatures. These field measurements demonstrate the capabilities of the approach for use in detecting large but highly variable emissions in arctic environments.

show abstract

Evaluation of a micrometeorological mass balance method employing an open-path laser for measuring methane emissions

Cited by 43 publications

References 15 publications

Review of substances/agents that have direct beneficial effect on the environment: mode of action and assessment of efficacy

Review of substances/agents that have direct beneficial effect on the environment: mode of action and assessment of efficacy

A proposed approach to estimate and reduce net greenhouse gas emissions from whole farms

Long-Path Quantum Cascade Laser–Based Sensor for Methane Measurements

Contact Info

Product

Resources

About