scholarly journals Orbital Signals in Carbon Isotopes: Phase Distortion as a Signature of the Carbon Cycle

2017 ◽  
Vol 32 (11) ◽  
pp. 1236-1255 ◽  
Author(s):  
Jiří Laurin ◽  
Bohuslav Růžek ◽  
Martino Giorgioni
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotopes ◽  
Phase Distortion

PMIP-carbon: towards a multi-models comparison of climate-carbon interactions at the Last Glacial Maximum

2020 ◽  
Author(s):  
Nathaelle Bouttes ◽  
Ruza Ivanovic ◽  
Ayako Abe-Ouchi ◽  
Hidetaka Kobayashi ◽  
Laurie Menviel ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotopes ◽  
Last Glacial Maximum ◽  
Ocean Circulation ◽  
Ice Cores ◽  
Glacial Maximum ◽  
Last Glacial ◽  
Intercomparison Project ◽  
The Last Glacial Maximum ◽  
The Last Glacial

<p>More and more climate models now include the carbon cycle, but multi-models studies of climate-carbon simulations within the Climate Model Intercomparison Project (CMIP) are limited to present and future time periods. In addition, the carbon cycle is not considered in the simulations of past periods analysed within the Paleoclimate Modelling Intercomparison Project (PMIP). Yet, climate-carbon interactions are crucial to anticipate future atmospheric CO<sub>2</sub> concentrations and their impact on climate. Such interactions can change depending on the background climate, it is thus necessary to compare model results among themselves and to data for past periods with different climates such as the Last Glacial Maximum (LGM).</p><p>The Last Glacial Maximum, around 21,000 years ago, was about 4°C colder than the pre-industrial, and associated with large ice sheets on the American and Eurasian continents. It is one of the best documented periods thanks to numerous paleoclimate archives such as marine sediment cores and ice cores. Despite this period having been studied for years, no consensus on the causes of the lower atmospheric CO<sub>2</sub> concentration at the time (around 180 ppm) has been reached and models still struggle to simulate these low CO<sub>2</sub> values. The ocean, which contains around 40 times more carbon than the atmosphere, likely plays a key role, but models tend to simulate ocean circulation changes in disagreement with proxy data, such as carbon isotopes.</p><p>This new project aims at comparing, for the first time, the carbon cycle representation at the Last Glacial Maximum from general circulation models and intermediate complexity models. We will explain the protocol and present first results in terms of carbon storage in the main reservoirs (atmosphere, land and ocean) and their link to key climate variables such as temperature, sea ice and ocean circulation. The use of coupled climate-carbon models will not only allow to compare changes in the carbon cycle in models and analyse their causes, but it will also enable us to better compare to indirect data related to the carbon cycle such as carbon isotopes.</p>

scholarly journals Compiled records of carbon isotopes in atmospheric CO<sub>2</sub> for historical simulations in CMIP6

2017 ◽  
Author(s):  
Heather Graven ◽  
Colin E. Allison ◽  
David M. Etheridge ◽  
Samuel Hammer ◽  
Ralph F. Keeling ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotopes ◽  
Coupled Model ◽  
Atmospheric Co2 ◽  
Historical Period ◽  
Terrestrial Biosphere ◽  
Climate Simulations ◽  
Intercomparison Project ◽  
Natural Carbon ◽  
Carbon Cycle Modelling

Abstract. The isotopic composition of carbon (Δ14C and δ13C) in atmospheric CO2 and in oceanic and terrestrial carbon reservoirs is influenced by anthropogenic emissions and by natural carbon exchanges, which can respond to and drive changes in climate. Simulations of 14C and 13C in the ocean and terrestrial components of Earth System Models (ESMs) present opportunities for model evaluation and for investigation of carbon cycling, including anthropogenic CO2 emissions and uptake. The use of carbon isotopes in novel evaluation of the ESMs' component ocean and terrestrial biosphere models and in new analyses of historical changes may improve predictions of future changes in the carbon cycle and climate system. We compile existing data to produce records of Δ14C and δ13C in atmospheric CO2 for the historical period 1850–2015. The primary motivation for this compilation is to provide the atmospheric boundary condition for historical simulations in the Coupled Model Intercomparison Project 6 (CMIP6) for models simulating carbon isotopes in their ocean or terrestrial biosphere models. The data may also be useful for other carbon cycle modelling activities.

scholarly journals Carbon isotopes in clastic rocks and the Neoproterozoic carbon cycle

2020 ◽  
Vol 320 (2) ◽  
pp. 97-124 ◽  
Author(s):  
Donald E. Canfield ◽  
Andrew H. Knoll ◽  
Simon W. Poulton ◽  
Guy M. Narbonne ◽  
Gregory R. Dunning
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotopes ◽  
Clastic Rocks

scholarly journals Early Triassic fluctuations of the global carbon cycle: New evidence from paired carbon isotopes in the western USA basin

2017 ◽  
Vol 154 ◽  
pp. 10-22 ◽  
Author(s):  
Gwénaël Caravaca ◽  
Christophe Thomazo ◽  
Emmanuelle Vennin ◽  
Nicolas Olivier ◽  
Théophile Cocquerez ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotopes ◽  
Global Carbon Cycle ◽  
Early Triassic ◽  
Western Usa ◽  
New Evidence ◽  
Global Carbon

Paleozoic carbon cycle dynamics: Insights from stable carbon isotopes in carbonate and C3 land plants

2021 ◽  
pp. 103813
Author(s):  
Yixin Dong ◽  
Ying Cui ◽  
Jiuyuan Wang ◽  
Hongde Chen ◽  
Feifei Zhang ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotopes ◽  
Stable Carbon Isotopes ◽  
Land Plants ◽  
Stable Carbon

scholarly journals Compiled records of carbon isotopes in atmospheric CO<sub>2</sub> for historical simulations in CMIP6

2017 ◽  
Vol 10 (12) ◽  
pp. 4405-4417 ◽  
Author(s):  
Heather Graven ◽  
Colin E. Allison ◽  
David M. Etheridge ◽  
Samuel Hammer ◽  
Ralph F. Keeling ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotopes ◽  
Coupled Model ◽  
Atmospheric Co2 ◽  
Historical Period ◽  
Terrestrial Biosphere ◽  
Climate Simulations ◽  
Intercomparison Project ◽  
Natural Carbon ◽  
Carbon Cycle Modelling

Abstract. The isotopic composition of carbon (Δ14C and δ13C) in atmospheric CO2 and in oceanic and terrestrial carbon reservoirs is influenced by anthropogenic emissions and by natural carbon exchanges, which can respond to and drive changes in climate. Simulations of 14C and 13C in the ocean and terrestrial components of Earth system models (ESMs) present opportunities for model evaluation and for investigation of carbon cycling, including anthropogenic CO2 emissions and uptake. The use of carbon isotopes in novel evaluation of the ESMs' component ocean and terrestrial biosphere models and in new analyses of historical changes may improve predictions of future changes in the carbon cycle and climate system. We compile existing data to produce records of Δ14C and δ13C in atmospheric CO2 for the historical period 1850–2015. The primary motivation for this compilation is to provide the atmospheric boundary condition for historical simulations in the Coupled Model Intercomparison Project 6 (CMIP6) for models simulating carbon isotopes in the ocean or terrestrial biosphere. The data may also be useful for other carbon cycle modelling activities.

The online detection of carbon isotopes by laser-induced breakdown spectroscopy

2020 ◽  
Vol 35 (2) ◽  
pp. 341-346 ◽  
Author(s):  
Qihang Zhang ◽  
Yuzhu Liu ◽  
Wenyi Yin ◽  
Yihui Yan ◽  
Qiyang Tang ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotopes ◽  
Laser Induced Breakdown Spectroscopy ◽  
Online Detection ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

The study of the carbon cycle is profound to the global ecosystem.

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