Concept

Cromérien

Publications associées (20)

Antarctic surface temperature and elevation during the Last Glacial Maximum

The Antarctic Vostok ice core provided compelling evidence of the nature of climate, and of climate feedbacks, over the past 420,000 years. Marine records suggest that the amplitude of climate variability was smaller before that time, but such records are ...

Springer Science and Business Media LLC2021

Snapshots of mean ocean temperature over the last 700,000 yr using noble gases in the EPICA Dome C ice core

Adrien Michel

Together with the latent heat stored in glacial ice sheets the ocean heat uptake carries the lion’s share of glacial/interglacial changes in the planetary heat content but little direct information on the global mean ocean temperature (MOT) is available to ...

2020

The relative importance of methane sources and sinks over the Last Interglacial period and into the last glaciation

Jérôme Chappellaz

The largest natural increases in atmospheric CO2 concentration as recorded in ice cores occur when the Earth climate abruptly shifts from a glacial to an interglacial state. Open questions remain regarding the processes at play, the sequences of events and ...

Elsevier BV2015

Factors controlling variability in the oxidative capacity of the troposphere since the Last Glacial Maximum

Jed Oliver Kaplan, Mirjam Pfeiffer

The oxidative capacity of past atmospheres is highly uncertain. We present here a new climate-biosphere-chemistry modeling framework to determine oxidant levels in the present and past troposphere. We use the GEOS-Chem chemical transport model driven by me ...

Copernicus Gesellschaft Mbh2014

NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core

Jérôme Chappellaz

Using new and previously published CO2 data from the EPICA Dome C ice core (EDC), we reconstruct a new high-resolution record of atmospheric CO2 during Marine Isotope Stage (MIS) 6 (190 to 135 ka) the penultimate glacial period. Similar to the last glacial ...

Copernicus GmbH2014

A 60 yr record of atmospheric carbon monoxide reconstructed from Greenland firn air

Jérôme Chappellaz

During the last glacial cycle, Greenland temperature showed many rapid temperature variations, the so-called Dansgaard-Oeschger (DO) events. The past atmospheric methane concentration closely followed these temperature variations, which implies that the wa ...

Copernicus GmbH2013

Atmospheric impacts and ice core imprints of a methane pulse from clathrates

Jérôme Chappellaz

Reconstructions of past atmospheric concentrations of greenhouse gases provide unique insight into the biogeochemical cycles and the past radiative forcing in the Earth's climate system. We present new measurements of atmospheric nitrous oxide along the ic ...

Elsevier BV2012

Abrupt rise in atmospheric CO2 at the onset of the Boølling/ Alleroød: In-situ ice core data versus true atmospheric signals

Jérôme Chappellaz

During the last glacial/interglacial transition the Earth's climate underwent abrupt changes around 14.6 kyr ago. Temperature proxies from ice cores revealed the onset of the Boølling/Alleroød (B/A) warm period in the north and the start of the Antarctic C ...

Copernicus GmbH2011

Changes in atmospheric CO2 and its carbon isotopic ratio during the penultimate deglaciation

Jérôme Chappellaz

Climate models show strong links between Antarctic and global temperature both in future and in glacial climate simulations. Past Antarctic temperatures can be estimated from measurements of water stable isotopes along the EPICA Dome C ice core over the pa ...

Elsevier BV2010

Constraint of the CO2 rise by new atmospheric carbon isotopic measurements during the last deglaciation

Jérôme Chappellaz

The suggestion of climatic instability during the last interglacial period (Eem), based on the bottom 10% of the Greenland Ice core Project (GRIP) isotopic profile, has been questioned because the bottom record from the neighboring Greenland Ice Sheet Proj ...

American Geophysical Union (AGU)2010

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