In situ measurements of methane in the troposphere and the stratosphere by the Ultra Light SpEctrometer Amulse

Khair, Zineb Miftah El; Joly, Lilian; Cousin, Julien; Decarpenterie, Thomas; Dumelié, Nicolas; Maamary, Rabih; Chauvin, Nicolas; Durry, Georges

doi:10.1007/s00340-017-6850-4

Cited by 7 publications

(12 citation statements)

References 29 publications

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“…Isotopic composition allows different source categories to be distinguished. Biologically produced methane has a typical δ 13 C ratio of −70 ‰ to −55 ‰ (France et al, 2016;Nisbet et al, 2016), methane from fossil fuels has a typical value of −55 ‰ to −25 ‰ (Kirschke et al, 2013), and methane from fires has values of −25 ‰ to −13 ‰ (Kirschke et al, 2013;Nisbet et al, 2016). Further, smaller differences in the isotopic composition are observed for different geographic regions.…”

Section: Introductionmentioning

confidence: 99%

“…Global mean CH 4 concentration increased until the early 1990s and then mostly stabilized for about a decade (Dlugokencky et al, 2003). Since 2007, growth has resumed (Dlugokencky et al, 2013), which is visible in the remote polar areas as well (Nisbet et al, 2016). The stabilization was proposed to have been a consequence of reduction in methane emissions from Siberian gas fields and other sources inside the Soviet Union after its collapse, changes in rice agriculture, and changes in microbial emissions (Dlugokencky et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Further, smaller differences in the isotopic composition are observed for different geographic regions. The background value of air in the free troposphere currently has a value of around −47.4 ‰ at northern latitudes (Nisbet et al, 2016). The isotopic shift towards depleted (lower, more negative) δ 13 C values indicates an increasing share of biogenic origin (Nisbet et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…An air sampling concept based on filling evacuated stainless steel containers by remotely opening a valve and subsequent chemical analyses of trace gases and first applications on multicopter systems have been shown (Chang et al, 2016(Chang et al, , 2018. In situ methane analysers small enough to be integrated on a UAS have been presented (Gurlit et al, 2005;Miftah El Khair et al, 2017;Graf et al, 2018), and the first scientific articles showing field measurements of in situ multicopter-borne methane concentrations up to an altitude of 600 m have been published (Golston et al, 2017). The method of air sampling and methane isotopic analyses has been applied to (manned) airborne measurements with high payload capacity in the lower troposphere, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Studying boundary layer methane isotopy and vertical mixing processes at a rewetted peatland site using an unmanned aircraft system

et al. 2020

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Abstract. The combination of two well-established methods, of quadrocopter-borne air sampling and methane isotopic analyses, is applied to determine the source process of methane at different altitudes and to study mixing processes. A proof-of-concept study was performed to demonstrate the capabilities of quadrocopter air sampling for subsequently analysing the methane isotopic composition δ13C in the laboratory. The advantage of the system compared to classical sampling on the ground and at tall towers is the flexibility concerning sampling location, and in particular the flexible choice of sampling altitude, allowing the study of the layering and mixing of air masses with potentially different spatial origin of air masses and methane. Boundary layer mixing processes and the methane isotopic composition were studied at Polder Zarnekow in Mecklenburg–West Pomerania in the north-east of Germany, which has become a strong source of biogenically produced methane after rewetting the drained and degraded peatland. Methane fluxes are measured continuously at the site. They show high emissions from May to September, and a strong diurnal variability. For two case studies on 23 May and 5 September 2018, vertical profiles of temperature and humidity were recorded up to an altitude of 650 and 1000 m, respectively, during the morning transition. Air samples were taken at different altitudes and analysed in the laboratory for methane isotopic composition. The values showed a different isotopic composition in the vertical distribution during stable conditions in the morning (delta values of −51.5 ‰ below the temperature inversion at an altitude of 150 m on 23 May 2018 and at an altitude of 50 m on 5 September 2018, delta values of −50.1 ‰ above). After the onset of turbulent mixing, the isotopic composition was the same throughout the vertical column with a mean delta value of −49.9 ± 0.45 ‰. The systematically more negative delta values occurred only as long as the nocturnal temperature inversion was present. During the September study, water samples were analysed as well for methane concentration and isotopic composition in order to provide a link between surface and atmosphere. The water samples reveal high variability on horizontal scales of a few tens of metres for this particular case. The airborne sampling system and consecutive analysis chain were shown to provide reliable and reproducible results for two samples obtained simultaneously. The method presents a powerful tool for distinguishing the source process of methane at different altitudes. The isotopic composition showed clearly depleted delta values directly above a biological methane source when vertical mixing was hampered by a temperature inversion, and different delta values above, where the air masses originate from a different footprint area. The vertical distribution of methane isotopic composition can serve as tracer for mixing processes of methane within the atmospheric boundary layer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Studying boundary layer methane isotopy and vertical mixing processes at a rewetted peatland site using an unmanned aircraft system

et al. 2020

View full text Add to dashboard Cite

show abstract

“…An air sampling concept based on filling evacuated stainless steel containers by remotely opening a valve and subsequent chemical analyses of trace gases and first applications on multicopter systems have been shown (Chang et al, 2016(Chang et al, , 2018. In-situ methane analysers small enough to be integrated on a UAS have been presented (Gurlit et al, 2005;Miftah El Khair et al, 2017;Graf et al, 2018), and first scientific articles showing field measurements of in-situ multicopter borne methane concentrations up to an altitude of 600 m have been published (Golston et 10 al., 2017). The method of air sampling and methane isotopic analyses has been applied to (manned) airborne measurements with high payload capacity in the lower troposphere, e.g.…”

Section: Introductionmentioning

confidence: 99%

Studying boundary layer methane isotopy and vertical mixing processes at a rewetted peatland site by unmanned aircraft system

Lampert¹,

Pätzold²,

Asmussen³

et al. 2019

Preprint

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A proof of concept study was performed to demonstrate the capabilities of quadrocopter air sampling for analysing the methane isotopic composition in the laboratory. Boundary layer mixing processes and the methane isotopic composition were studied with a quadrocopter system at Polder Zarnekow in Mecklenburg-West Pomerania in the North East of Germany, which has become a strong source of biogenically produced methane after rewetting the drained and degraded peatland. Methane 5 fluxes are measured continuously at the site. They show high emissions from May to September, and a strong diurnal variability with maximum methane fluxes up to 2 µmol m −2 s −1 for summer 2018. For two case studies on 23 May 2018 and 5 September 2018, vertical profiles of temperature and humidity were recorded up to an altitude of 650 m and 1000 m, respectively, during the morning transition. Air samples were taken at different altitudes and analysed in the laboratory for methane isotopic composition. The values showed a different isotopic signature in the vertical distribution during stable conditions in 10 the morning (-51.5 ‰ below the temperature inversion at an altitude of 150 m on 23 May 2018 and at an altitude of 50 m on 5 September 2018, -50.1 ‰ above). After the onset of turbulent mixing, the isotopic signature was the same throughout the vertical column with a mean value of -49.9 ± 0.45 ‰. During the September study, water samples were analysed as well for methane concentration and isotopic composition in order to provide a link between surface and atmosphere. The water samples reveal high variability on scales of few 10 m for this particular case. The airborne sampling system and consecutive analysis 15 chain were shown to provide reliable and reproducible results for two samples obtained simultaneously. The method presents a powerful tool for constraining the origin of methane by analysing its isotopic signature, and for measuring the vertical distribution of methane isotopic signature, which is based on mixing processes of methane within the atmospheric boundary layer.

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Assessing the impact of drought on water cycling in urban trees via in-situ isotopic monitoring of plant xylem water

Ring,

Tetzlaff,

Dubbert

et al. 2024

Journal of Hydrology

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In situ measurements of methane in the troposphere and the stratosphere by the Ultra Light SpEctrometer Amulse

Cited by 7 publications

References 29 publications

Studying boundary layer methane isotopy and vertical mixing processes at a rewetted peatland site using an unmanned aircraft system

Studying boundary layer methane isotopy and vertical mixing processes at a rewetted peatland site using an unmanned aircraft system

Studying boundary layer methane isotopy and vertical mixing processes at a rewetted peatland site by unmanned aircraft system

Assessing the impact of drought on water cycling in urban trees via in-situ isotopic monitoring of plant xylem water

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