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Observation of methane filled hexagonal ice stable up to 150 GPa

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The richness of the phase diagram of water reduces drastically at very high pressures where only two molecular phases, proton-disordered ice VII and proton-ordered ice VIII, are known. Both phases transform to the centered hydrogen bond atomic phase ice X ...

National Academy of Sciences2015

For clathrate-hydrate polymorphic structure-type (sI versus sII), geometric recognition criteria have been developed and validated. These are applied to the study of the rich interplay and development of both sI and sII motifs in a variety of hydrate-nucle ...

Amer Inst Physics2015

Methane Clathrate Hydrate Nucleation Mechanism by Advanced Molecular Simulations

Simone Meloni

The nucleation mechanisms of methane hydrates are studied using well-tempered metadynamics and restrained molecular dynamics. The collective variables we used to follow the process are the methane-methane and methane-water coordination numbers, from which ...

Amer Chemical Soc2014

Pressure-induced transformations in LiCl-H2O at 77 K

Livia Eleonora Bove Kado

A systematic study of the properties of high-density amorphous ice (HDA) in the presence of increasing amounts of salt is missing, especially because it is challenging to avoid ice crystallization upon cooling the pressurized liquid. In order to be able to ...

Royal Soc Chemistry2014

Continuous methane measurements from a late Holocene Greenland ice core: Atmospheric and in-situ signals

Jérôme Chappellaz

The stable carbon isotopic signature of carbon dioxide (δ13CO2) measured in the air occlusions of polar ice provides important constraints on the carbon cycle in past climates. In order to exploit this information for previous glacial periods, one must use ...

Elsevier BV2013

High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core

Jérôme Chappellaz, Daniele Romanini

The Greenland NEEM (North Greenland Eemian Ice Drilling) operation in 2010 provided the first opportunity to combine trace-gas measurements by laser spectroscopic instruments and continuous-flow analysis along a freshly drilled ice core in a field-based se ...

Copernicus GmbH2013

We investigate for the first time the loss and alteration of past atmospheric information from air trapping mechanisms under low-accumulation conditions through continuous CH4 (and CO) measurements. Methane concentration changes were measured over the Dans ...

Copernicus GmbH2013

Carbon isotope constraints on the deglacial CO2 rise from ice cores

Jérôme Chappellaz

ICE-CORE reconstructions of atmospheric methane concentrations for the past 220 kyr have revealed large variations associated with different climatic periods1-4. But the phase relationship between climate and methane has been uncertain because of dating un ...

Springer Science and Business Media LLC2012

Variations of air content in Dasuopu ice core from AD 1570-1927 and implications fore climate change

Jérôme Chappellaz

In relation to Arctic warming, the possible occurrence of methane hydrate degassing events has attracted an increasing interest in recent years. We evaluate the atmospheric impact of rapid and massive emissions of methane and how they are imprinted in ice ...

Elsevier BV2011

Stable carbon isotope ratio analyses on trace methane from ice samples

Measurement of the concentration and stable isotope ratios of methane from air enclosures in ancient ice can aid in understanding the temporal dynamics of methane sources and sinks. These measurements can reconstruct past atmospheric compositions on scales ...

2011