Advanced searches left 3/3

Carbon Isotope - Astrophysics Data System

Summarized by Plex Scholar
Last Updated: 10 January 2023

* If you want to update the article please login/register

Molecular characteristics and stable carbon isotope compositions of dicarboxylic acids and related compounds in wintertime aerosols of Northwest China

Oxalic acid is the most abundant compound followed by methylglyoxal and azelaic acid, followed by methylglyoxal and azelaic acid. The ratios of C 9/C 6 and C 9/Ph indicate that atmospheric dicarboxylic acids in winter in the area mainly originated from biomass burning. Because of the depletion of 13 C in aqSOA products rather than aerosol aging, lighter carbon isotope compositions tend to be oxidized to produce aqueous-phase secondary organic aerosols, according to the u03b4-13C study of C2, resulting in the decay of 13 C in aqSOA products rather than aerosol aging.

Source link: https://ui.adsabs.harvard.edu/abs/2022NatSR..1211266Q/abstract


Monitoring of magmatic-hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases

We regularly measured isotopic compositions of noble gases and CO 2 in volcanic gases sampled at six fumaroles around Kusatsu-Shirane volcano between 2014 and 2021 to detect changes displaying new volcanic activity. The rise in magmatic gas supply is also aided by temporal fluctuations in 3 He/CO 2 ratios and carbon isotopic ratios of CO 2. In the period of high 3 He/ 4 He ratios, the 3 He/40 Ar* ratios have seen significant rises. These findings are further evidence for the use of noble gas and carbon isotopic compositions of fumarolic gases for monitoring magmatic-hydrothermal systems.

Source link: https://ui.adsabs.harvard.edu/abs/2022NatSR..1217967O/abstract


Evidence for the early Toarcian Carbon Isotope Excursion (T-CIE) from the shallow marine siliciclastic red beds of Arabia

Both in the Tethyan region and globally, the Toarcian Oceanic Anoxic Event and its closely related Carbon Isotope Excursion have been widely reported. Although the low redox-sensitive elements in marine settings may have indicated a shallow oxic marine environment, the accompanying negative u03b4 13 C organic decline and apparent increase in the chemical weathering indicates that the deposition of Marrat red beds coincided with the T-CIE's development and perhaps time-equivalent to the T-OAE globally. Since our report publishes the first record of the T-CIE and discusses the formation of shallow marine siliciclastic red beds in the Arabian Plate, it will have major implications on the overall T-CIE's global study and hydrocarbon exploration through the discovery of new source rocks associated with the OAEs in the Toarcian and other time intervals.

Source link: https://ui.adsabs.harvard.edu/abs/2022NatSR..1218124A/abstract


Stable carbon isotopes of woods during carbonization and their correlation with climatic factors

We investigated the difference between u03b413C of charcoal and environmental variables in wildfire experiments and indoor studies regarding genera and species in order to establish the correlations between u03b413C of charcoal and climate variables on the basis of carbonization experiments.

Source link: https://ui.adsabs.harvard.edu/abs/2022PLoSO..1770133L/abstract


Subducted organic matter buffered by marine carbonate rules the carbon isotopic signature of arc emissions

In arc magmas, some carbon is removed from the slab and returned to the atmosphere as CO 2 in arc magmas, but not so much as in arc magmas. The primary process determining CO 2 production is oxidative dissolution of graphite, according to We demonstrate that oxidative dissolution of graphite is the key process controlling graphite production, and that its isotopic composition corresponds to the CO 2/CaCO 3 fraction rather than the bulk graphite/CaCO 3 fraction. We provide a numerical scheme to link the arc CO 2 isotopic signature with the fluid-rock ratios and the redox state in force in the subarc source.

Source link: https://ui.adsabs.harvard.edu/abs/2022NatCo..13.2909T/abstract


Parameters for the Formation of the Dobroe Gold Deposit (Yenisei Ridge, Russia): Evidence from Fluid Inclusions and S–C Isotopes

One of the gold mines found within the Yenisei Ridge Orogenic Belt is the Dobroe deposit, which contains 10 t gold deposits. Orogenic gold deposits are now being widely discussed, ore-forming conditions have been widely discussed.

Source link: https://ui.adsabs.harvard.edu/abs/2022Mine...13...11S/abstract


High-resolution record of multiple organic carbon-isotope excursions in lacustrine deposits of Upper Sinemurian through Pliensbachian (Early Jurassic) from the Sichuan Basin, China

We present a high-resolution u03b413Corg record and palynological data from the Lower Jurassic lacustrine succession of the Sichuan Basin that allows for the emergence of a significant 8-u2030 negative carbon-isotope excursion at the Sinemurian-Pliensbachian transition. According to Palynological reports, a drastic change from arid to humid climate conditions coincident with the carbon-isotope perturbation that supports a scenario of lake expansion fueled by increased rainfall leads to a rapid change. A global decrease in the sea level has been noted at the start of the isotope disturbances in comparison to observations in the Sichuan Basin, where deep lake conditions persisted across the Sinemurian-Pliensbachian boundary event. This means that eustatic oscillations in lakes and aquifers during a wetter climate period may have been associated with the early stages of the Sinemurian-Pliensbachian boundary event.

Source link: https://ui.adsabs.harvard.edu/abs/2023GSAB..135....3F/abstract


Spatio-Temporal Variations in Carbon Isotope Discrimination Predicted by the JULES Land Surface Model

Plants with stable carbon isotopes can help analyze and improve the representation of carbon and water cycles in land-surface models, as well as increasing assurance in predictions of vegetation response to climate change. Here, we analyzed the predictive abilities of the Joint UK Land Environmental Simulator to capture spatio-temporal shifts in carbon isotope discrimination reconstruction in the United Kingdom over the period 1979-2016. The modeled u0394 13 C time series at eight sites were highly correlated with tree-ring u0394 13 C, but JULES underestimated mean u0394 13 C values at all eight locations by up to 2. 6 u2030. JULES estimated the overall effect of environmental drivers on u0394 13 C based on a variety of sources together, but some locations struggled to capture the change in u0394 13 C caused by air temperature, atmospheric CO 2, and a vapor pressure deficit at some locations.

Source link: https://ui.adsabs.harvard.edu/abs/2022JGRG..12707041P/abstract

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions