scholarly journals Compound-specific stable carbon isotopic signature of carbohydrate pyrolysis products from C3 and C4 plants

2015 ◽  
Vol 96 (3) ◽  
pp. 948-953 ◽  
Author(s):  
José A González-Pérez ◽  
Nicasio T Jiménez-Morillo ◽  
José M de la Rosa ◽  
Gonzalo Almendros ◽  
Francisco J González-Vila
Keyword(s):  
Isotopic Signature ◽  
C4 Plants ◽  
Stable Carbon ◽  
C3 And C4 Plants ◽  
Pyrolysis Products ◽  
Carbon Isotopic

Seasonal variations in the stable carbon isotopic signature of biogenic methane in a coastal sediment

Science ◽  
1986 ◽  
Vol 233 (4770) ◽  
pp. 1300-1303 ◽  
Author(s):  
C. Martens ◽  
N. Blair ◽  
C. Green ◽  
D. Des Marais
Keyword(s):  
Seasonal Variations ◽  
Isotopic Signature ◽  
Coastal Sediment ◽  
Stable Carbon ◽  
Biogenic Methane ◽  
Carbon Isotopic

Recognition of n-alkyl and isoprenoid algaenans in marine sediments by stable carbon isotopic analysis of pyrolysis products of kerogens

1998 ◽  
Vol 28 (3-4) ◽  
pp. 179-194 ◽  
Author(s):  
Ingeborg M Höld ◽  
Stefan Schouten ◽  
Heidy M.E van Kaam-Peters ◽  
Jaap S Sinninghe Damsté
Keyword(s):  
Marine Sediments ◽  
Isotopic Analysis ◽  
Stable Carbon ◽  
Pyrolysis Products ◽  
Carbon Isotopic

scholarly journals Stable carbon isotopic composition of biomass burning emissions – implications for estimating the contribution of C3 and C4 plants

2021 ◽  
Author(s):  
Roland Vernooij ◽  
Ulrike Dusek ◽  
Maria Elena Popa ◽  
Peng Yao ◽  
Anupam Shaikat ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Biomass Burning ◽  
Field Experiments ◽  
Combustion Products ◽  
C4 Plants ◽  
C3 Plants ◽  
Stable Carbon ◽  
Atmospheric Measurements ◽  
C3 And C4 Plants ◽  
Large Variability

Abstract. Landscape fires are a significant contributor to atmospheric burdens of greenhouse gases and aerosols. Although many studies have looked at biomass burning products and their fate in the atmosphere, estimating and tracing atmospheric pollution from landscape fires based on atmospheric measurements is challenging due to the large variability in fuel composition and burning conditions. Stable carbon isotopes in biomass burning (BB) emissions can be used to trace the contribution of C3 plants (e.g., trees or shrubs) and C4 plants (e.g. savanna grasses) to various combustion products. However, there are still many uncertainties regarding changes in isotopic composition (also known as fractionation) of the emitted carbon compared to the burnt fuel during the pyrolysis and combustion processes. To study BB isotope fractionation, we performed a series of laboratory fire experiments in which we burned pure C3 and C4 plants as well as mixtures of the two. Using isotope ratio mass spectrometry (IRMS), we measured stable carbon isotope signatures in the pre-fire fuels and post-fire residual char, as well as in the CO2, CO, CH4, organic carbon (OC), and elemental carbon (EC) emissions, which together constitute over 98 % of the post-fire carbon. Our laboratory tests indicated substantial isotopic fractionation in combustion products compared to the fuel, which varied between the measured fire products. CO2, EC and residual char were the most reliable tracers of the fuel 13C signature. CO in particular showed a distinct dependence on burning conditions; flaming emissions were enriched in 13C compared to smouldering combustion emissions. For CH4 and OC, the fractionation was opposite for C3 emissions (13C-enriched) and C4 emissions (13C-depleted). This indicates that while it is possible to distinguish between fires that were dominated by either C3 or C4 fuels using these tracers, it is more complicated to quantify their relative contribution to a mixed-fuel-fire based on the δ13C signature of emissions. Besides laboratory experiments, we sampled gases and carbonaceous aerosols from prescribed fires in the Niassa special Reserve (NSR) in Mozambique, using an unmanned aerial system (UAS)-mounted sampling set-up. We also provide a range of C3 : C4 contributions to the fuel and measured the fuel isotopic signatures. While both OC and EC were useful tracers of the C3 to C4 fuel ratio in mixed fires in the lab, we found particularly OC to be depleted compared to the calculated fuel signal in the field experiments. This suggests that either our fuel measurements were incomprehensive and underestimated the C3 : C4 ratio in the field, or that other processes caused this depletion. Although additional field measurements are needed, our results indicate that C3 vs C4 source ratio estimation is possible with most BB products, albeit with varying uncertainty ranges.

Stable carbon isotope variation in C3 and C4 plants along the Amazon River

Nature ◽  
1991 ◽  
Vol 353 (6339) ◽  
pp. 57-59 ◽  
Author(s):  
Luiz A. Martinelli ◽  
Allan H. Devol ◽  
Reynaldo L. Victoria ◽  
Jeffrey E. Richey
Keyword(s):  
Carbon Isotope ◽  
Stable Carbon Isotope ◽  
C4 Plants ◽  
Amazon River ◽  
Stable Carbon ◽  
C3 And C4 Plants ◽  
Isotope Variation

scholarly journals Climate and CO<sub>2</sub> modulate the C<sub>3</sub>/C<sub>4</sub> balance and δ<sup>13</sup>C signal in simulated vegetation

2009 ◽  
Vol 5 (3) ◽  
pp. 431-440 ◽  
Author(s):  
O. Flores ◽  
E. S. Gritti ◽  
D. Jolly
Keyword(s):  
Isotopic Fractionation ◽  
C4 Plants ◽  
The Other ◽  
C3 And C4 Plants ◽  
Atmospheric Concentration ◽  
Global Parameter ◽  
Carbon Isotopic ◽  
Co2 Effects ◽  
Vegetation Modelling ◽  
Carbon Isotopic Fractionation

Abstract. Climate and atmospheric CO2 effects on the balance between C3 and C4 plants have received conflicting interpretations based on the analysis of carbon isotopic fractionation (δ13C) in sediments. But, climate and CO2 effects on the C3/C4 balance and δ13C signal are rarely addressed together. Here, we use a process-based model (BIOME4) to disentangle these effects. We simulated the vegetation response to climate and CO2 atmospheric concentration (pCO2) in two sites in which vegetation changed oppositely, with respect to C3 and C4 plants abundance, during the Last Glacial Maximum to Holocene transition. The C3/C4 balance and δ13C signal were primarily sensitive to temperature and CO2 atmospheric partial pressure. The simulated variations were in agreement with patterns observed in palaeorecords. Water limitation favoured C4 plants in case of large negative deviation in rainfall. Although a global parameter, pCO2 affected the δ13C signal differently from one site to the other because of its effects on the C3/C4 balance and on carbon isotopic fractionation in C3 and C4 plants. Simulated Plant functional types (PFT) also differed in their composition and response from one site to the other. The C3/C4 balance involved different competing C3 and C4 PFT, and not homogeneous C3 and C4 poles as often assumed. Process-based vegetation modelling emphasizes the need to account for multiple factors when a palaeo-δ13C signal is used to reconstruct the C3/C4 balance.

scholarly journals Factors influencing the stable carbon isotopic signature of methane from combustion and biomass burning

2000 ◽  
Vol 105 (D2) ◽  
pp. 1867-1877 ◽  
Author(s):  
Jeffrey P. Chanton ◽  
Christine M. Rutkowski ◽  
Candace C. Schwartz ◽  
Darold E. Ward ◽  
Lindsay Boring
Keyword(s):  
Biomass Burning ◽  
Isotopic Signature ◽  
Stable Carbon ◽  
Carbon Isotopic ◽  
Factors Influencing
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