A high-resolution record of atmospheric CO2 content from carbon isotopes in pet

White, James W. C.; Ciais, Philippe; Figge, Regina A.; Kenny, Ray; Markgraf, Vera

doi:10.1038/367153a0

Cited by 158 publications

(110 citation statements)

References 23 publications

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“…The d 13 C of plant matter depends directly on atmospheric d 13 CO 2 , (e.g. White et al 1994;Gröcke 2002), as well as on the photosynthetic pathways (Calvin-Benson cycle and Hatch-Slack cycle, i.e. C 3 and C 4 photosynthesis, respectively) and various environmental parameters, such as water tensions, temperature and biostressors (e.g.…”

Section: Source Components Of Pih Yd-pb and Lgm Global Methane Invenmentioning

confidence: 99%

Constraining past global tropospheric methane budgets with carbon and hydrogen isotope ratios in ice

Whiticar

Schaefer

2007

Phil. Trans. R. Soc. A.

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Upon closer inspection, the classical view of the synchronous relationship between tropospheric methane mixing ratio and Greenland temperature observed in ice samples reveals clearly discernable variations in the magnitude of this response during the Late Pleistocene (!50 kyr BP). During the Holocene this relationship appears to decouple, indicating that other factors have modulated the methane budget in the past 10 kyr BP. The d 13 CH 4 and dD-CH 4 of tropospheric methane recorded in ice samples provide a useful constraint on the palaeomethane budget estimations. Anticipated changes in palaeoenvironmental conditions are recorded as changes in the isotope signals of the methane precursors, which are then translated into past global d 13 CH 4 and dD-CH 4 signatures. We present the first methane budgets for the late glacial period that are constrained by dual stable isotopes. The overall isotope variations indicate that the Younger Dryas ( YD) and Preindustrial Holocene have methane that is 13 C-and 2 H-enriched, relative to Modern. The shift is small for d 13 CH 4 (approx. 1‰) but greater for dD-CH 4 (approx. 9‰). The YD d 13 CH 4 -dD-CH 4 record shows a remarkable relationship between them from 12.15 to 11.52 kyr BP. The corresponding C-and H-isotope mass balances possibly indicate fluctuating emissions of thermogenic gas. This d 13 CH 4 -dD-CH 4 relationship breaks down during the YD-Preboreal transition. In both age cases, catastrophic releases of hydrates with Archaeal isotope signatures can be ruled out. Thermogenic clathrate releases are possible during the YD period, but so are conventional natural gas seepages.

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Section: Source Components Of Pih Yd-pb and Lgm Global Methane Invenmentioning

confidence: 99%

Constraining past global tropospheric methane budgets with carbon and hydrogen isotope ratios in ice

Whiticar

Schaefer

2007

Phil. Trans. R. Soc. A.

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“…Isotopic investigation of southern South American peat archives was pioneered in the 1990s (White et al, 1994;Pendall et al, 2001) and later followed by palaeohydroclimatic studies (Mauquoy et al, 2004;Chambers et al, 2007). Early work on peatland stable isotopes in bulk samples from NW European sites revealed very large amplitude variations in measured isotope values (Brenninkmeijer et al, 1982;Dupont and Brenninkmeijer, 1984;van Geel and Middeldorp, 1988).…”

Section: An Ideal Archive For Combined Hydroclimate and Water Isotopementioning

confidence: 99%

Investigating late Holocene variations in hydroclimate and the stable isotope composition of precipitation using southern South American peatlands: an hypothesis

et al. 2012

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Abstract. Ombrotrophic raised peatlands provide an ideal archive for integrating late Holocene records of variations in hydroclimate and the estimated stable isotope composition of precipitation with recent instrumental measurements. Modern measurements of mean monthly surface air temperature, precipitation, and δD and δ 18 O-values in precipitation from the late twentieth and early twenty-first centuries provide a short but invaluable record with which to investigate modern relationships between these variables, thereby enabling improved interpretation of the peatland palaeodata. Stable isotope data from two stations in the Global Network for Isotopes in Precipitation (GNIP) from southern South America (Punta Arenas, Chile and Ushuaia, Argentina) were analysed for the period 1982 to 2008 and compared with longer-term meteorological data from the same locations (1890 to present and 1931 to present, respectively). δD and δ 18 O-values in precipitation have exhibited quite different trends in response to local surface air temperature and precipitation amount. At Punta Arenas, there has been a marked increase in the seasonal difference between summer and winter δ 18 O-values. A decline in the deuterium excess of summer precipitation at this station was associated with a general increase in relative humidity at 1000 mb over the surface of the Southeast Pacific Ocean, believed to be the major vapour source for the local precipitation. At Ushuaia, a fall in δ 18 O-values was associated with an increase in the mean annual amount of precipitation. Both records are consistent with a southward retraction and increase in zonal wind speed of the austral westerly wind belt. These regional differences, observed in response to a known driver, should be detectable in peatland sites close to the GNIP stations. Currently, insufficient data with suitable temporal resolution are available to test for these regional differences over the last 3000 yr. Existing peatland palaeoclimate data from two sites near Ushuaia, however, provide evidence for changes in the late Holocene that are consistent with the pattern observed in modern observations.

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“…For example, White et al (1994) exploited the differences in CO 2 uptake between Sphagnum and sedges, recorded in their δ 13 C cellulose , to reconstruct Holocene atmospheric CO 2 concentrations, although temperature and humidity effects on δ 13 C had also to be considered. Sphagnum δ 13 C cellulose has also been shown to be strongly related to mean air temperatures along a transect in SW Poland (Skrzypek et al, 2007).…”

Section: Isotopic Analysis Of Plant Remainsmentioning

confidence: 99%

“…Precipitation and evaporation cause isotopic fractionation of hydrogen (δD) and oxygen (δ 18 O), so that the isotopic composition of the meteoric water used by peatland plants reflects a combination of precipitation source and peatland hydrology (Daley et al, in press). Stable carbon isotopes (δ 13 C) give important information on carbon pathways, including fractionation during photosynthesis (White et al, 1994;Williams and Flanagan, 1996), and the recycling of organic matter and consumption of CO 2 and methane by microbial activity (Pancost et al, 2000).…”

Section: Perspectivesmentioning

confidence: 99%

Stable isotopes and organic geochemistry in peat: Tools to investigate past hydrology, temperature and biogeochemistry

McClymont¹,

Pendall²,

Nichols³

2010

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A high-resolution record of atmospheric CO2 content from carbon isotopes in pet

Cited by 158 publications

References 23 publications

Constraining past global tropospheric methane budgets with carbon and hydrogen isotope ratios in ice

Constraining past global tropospheric methane budgets with carbon and hydrogen isotope ratios in ice

Investigating late Holocene variations in hydroclimate and the stable isotope composition of precipitation using southern South American peatlands: an hypothesis

Stable isotopes and organic geochemistry in peat: Tools to investigate past hydrology, temperature and biogeochemistry

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