scholarly journals The impact of different external sources of iron on the global carbon cycle

2014 ◽  
Vol 41 (3) ◽  
pp. 920-926 ◽  
Author(s):  
Alessandro Tagliabue ◽  
Olivier Aumont ◽  
Laurent Bopp
Keyword(s):  
Carbon Cycle ◽  
Global Carbon Cycle ◽  
External Sources ◽  
The Impact ◽  
Global Carbon

Basalt weathering laws and the impact of basalt weathering on the global carbon cycle

2003 ◽  
Vol 202 (3-4) ◽  
pp. 257-273 ◽  
Author(s):  
Céline Dessert ◽  
Bernard Dupré ◽  
Jérôme Gaillardet ◽  
Louis M. François ◽  
Claude J. Allègre
Keyword(s):  
Carbon Cycle ◽  
Global Carbon Cycle ◽  
Basalt Weathering ◽  
The Impact ◽  
Global Carbon

scholarly journals Organic Geochemical Characteristics of the Upper Cretaceous Qingshankou Formation Oil Shales in the Fuyu Oilfield, Songliao Basin, China: Implications for Oil-Generation Potential and Depositional Environment

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4778 ◽  
Author(s):  
Wentong He ◽  
Youhong Sun ◽  
Wei Guo ◽  
Xuanlong Shan ◽  
Siyuan Su ◽  
...  
Keyword(s):  
Organic Matter ◽  
Carbon Cycle ◽  
Depositional Environment ◽  
Global Carbon Cycle ◽  
Songliao Basin ◽  
Oil Generation ◽  
Oil Shales ◽  
Extractable Organic Matter ◽  
The Impact ◽  
Global Carbon

The Cretaceous Era has always been a focus of geologic and palaeoenvironmental studies. Previous researchers believed that the impact of the global carbon cycle represents significant short-term global biogeochemical fluctuations, leading to the formation of a large number of organic rich sediments in the marine environment. During the Turonian, a large number of organic-rich oil shales were deposited in the lakes of the Songliao Basin in the Qingshankou Formation. How the depositional environment affected the formation of oil shales in continental lakes and the characteristics of these oil shales remain controversial. In this paper, through sampling of Qingshankou Formation strata, various testing methods are used to provide a variety of new data to study the characteristics of oil shales and palaeoenvironment evolution history in the Songliao Basin. The research of the sediments in the Qingshankou Formation in the Fuyu oilfield, Songliao Basin, via result analysis revealed that the oil shales possess an excellent oil-generation potential with moderate-high total organic carbon (TOC) levels (0.58–9.43%), high hydrogen index (HI) values (265–959 mg hydrocarbons (HC)/g TOC), high extractable organic matter (EOM) levels (2.50–6.96 mg/g TOC) and high hydrocarbon fractions (48–89%). The sources of the organic matter were mainly zooplankton, red algae and higher plants (including marine organisms). The aqueous palaeoenvironment of the Qingshankou Formation was a saline water environment with a high sulfate concentration, which promoted an increase in nutrients and stratification of the water density in the lake basin. Oxygen consumption in the bottom water layer promoted the accumulation and burial of high-abundance organic matter, thus forming the high-quality oil shales in the Qingshankou Formation. The global carbon cycle, warm-humid palaeoclimate, dynamic local biogeochemical cycling and relative passive tectonism were the most likely reasons for the TOC increase and negative δ13Corg deviation.

scholarly journals The Impact of Agricultural Soil Erosion on the Global Carbon Cycle

Science ◽  
2007 ◽  
Vol 318 (5850) ◽  
pp. 626-629 ◽  
Author(s):  
K. Van Oost ◽  
T. A. Quine ◽  
G. Govers ◽  
S. De Gryze ◽  
J. Six ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Carbon Cycle ◽  
Agricultural Soil ◽  
Large Scale ◽  
Carbon Sink ◽  
Global Carbon Cycle ◽  
Agricultural Landscapes ◽  
Carbon Equivalent ◽  
The Impact ◽  
Global Carbon

Agricultural soil erosion is thought to perturb the global carbon cycle, but estimates of its effect range from a source of 1 petagram per year–1to a sink of the same magnitude. By using caesium-137 and carbon inventory measurements from a large-scale survey, we found consistent evidence for an erosion-induced sink of atmospheric carbon equivalent to approximately 26% of the carbon transported by erosion. Based on this relationship, we estimated a global carbon sink of 0.12 (range 0.06 to 0.27) petagrams of carbon per year–1resulting from erosion in the world's agricultural landscapes. Our analysis directly challenges the view that agricultural erosion represents an important source or sink for atmospheric CO2.

A shifting view of erosion and the carbon cycle

2020 ◽  
Author(s):  
Robert Hilton ◽  
Josh West
Keyword(s):  
Organic Carbon ◽  
Carbon Cycle ◽  
Numerical Models ◽  
Sedimentary Rocks ◽  
Global Carbon Cycle ◽  
Mountain Building ◽  
Organic Carbon Burial ◽  
Mountain Belts ◽  
The Impact ◽  
Global Carbon

<p>Mountain building results in high rates of erosion and the interaction of rocks with the atmosphere, water and life. The resulting geochemical transfers may steer the evolution of the global carbon cycle and Earth’s long-term climate. For decades, much attention has focused on the weathering of silicate minerals and associated carbon dioxide (CO<sub>2</sub>) drawdown, and it is now understood that mountains are places where this reaction is most sensitive to changes in climate. However, the focus on silicate weathering belies a multi-faceted role for mountain building and erosion in the carbon cycle. Erosion also mobilises organic carbon from forests, transferring it to rivers and delivering it to long-lived sedimentary deposits, which results in an additional CO<sub>2</sub> sink. In some mountain belts, exhumation of sedimentary rocks and exposure to the oxygen-rich atmosphere and hydrosphere can release CO<sub>2</sub> by oxidation of rock organic carbon and sulfide minerals. These fluxes remain poorly constrained.</p><p>Here we take stock of our current understanding of all of these processes and the magnitude of their fluxes, focusing on insight from modern-river catchments. We find that the net CO<sub>2</sub> budget associated with erosion and weathering appears to be controlled by processes that are not widely considered in conceptual or numerical models, specifically the fluxes from organic carbon burial and oxidation, and sulfuric acid weathering reactions. We suggest that lithology plays a major role in moderating the impact of mountain building on the global carbon cycle, with an orogeny dominated by sedimentary-rocks tending towards CO<sub>2</sub> neutrality, or indeed becoming a CO<sub>2</sub> source to the atmosphere. Over the coming century, erosion-induced changes in CO<sub>2</sub> emissions from sedimentary rocks may result in a previously overlooked positive feedback on anthropogenic climate change.</p>

scholarly journals Assisting the Evolution of the Observing System for the Carbon Cycle through Quantitative Network Design

2017 ◽  
Author(s):  
Thomas Kaminski ◽  
Peter Julian Rayner
Keyword(s):  
Carbon Cycle ◽  
Network Design ◽  
Observational Data ◽  
Data Streams ◽  
Recent Progress ◽  
Global Carbon Cycle ◽  
Modelling Framework ◽  
The Impact ◽  
Global Carbon

Abstract. Various observational data streams have been shown to provide valuable constraints on the state and evolution of the global carbon cycle. It is, however, difficult to decide which variables to sample how, where and when in order to achieve an optimal use of the observational capabilities. Quantitative Network Design (QND) assesses the impact of a given set of existing or hypothetical observations in a modelling framework. QND has been used to optimise in situ networks and assess the benefit from planned space missions. This paper describes recent progress and points at aspects that are not yet sufficiently addressed. It demonstrates the advantage of an integrated QND system that can simultaneously evaluate a multitude of observational data streams and assess their complementarity and redundancy.

The impact of Indonesian peatland degradation on downstream marine ecosystems and the global carbon cycle

2015 ◽  
Vol 22 (1) ◽  
pp. 325-337 ◽  
Author(s):  
Jesse F. Abrams ◽  
Sönke Hohn ◽  
Tim Rixen ◽  
Antje Baum ◽  
Agostino Merico
Keyword(s):  
Carbon Cycle ◽  
Global Carbon Cycle ◽  
Marine Ecosystems ◽  
The Impact ◽  
Peatland Degradation ◽  
Global Carbon

Are response function representations of the global carbon cycle ever interpretable?

Tellus B ◽  
2009 ◽  
Vol 61 (2) ◽  
Author(s):  
Sile Li ◽  
Andrew J. Jarvis ◽  
David T. Leedal
Keyword(s):  
Carbon Cycle ◽  
Response Function ◽  
Global Carbon Cycle ◽  
Global Carbon

EPR-derived structures of flavin radical and iron-sulfur clusters from Methylosinus sporium 5 reductase

2021 ◽  
Author(s):  
Han Sol Jeong ◽  
Sugyeong Hong ◽  
Hee Seon Yoo ◽  
Jin Kim ◽  
Yujeong Kim ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Crucial Role ◽  
Methane Monooxygenase ◽  
Global Carbon Cycle ◽  
Ambient Conditions ◽  
Iron Sulfur Clusters ◽  
Iron Sulfur ◽  
Greenhouse Effects ◽  
Global Carbon ◽  
Significant Attention

Methane monooxygenase (MMO) has attracted significant attention owing to its crucial role in the global carbon cycle; it impedes greenhouse effects by converting methane to methanol under ambient conditions. The...

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