Denis Lacelle

Prediction of the distribution of segregation ice in the Mars regolith with Mg(ClO4)2 salts

Denis Lacelle, David Fisher, Wayne Pollard, Michael Daly et autres

Quantifying the distribution and abundance of ground ice in the martian regolith is central to the exchange of water between the atmosphere, ice caps and the shallow subsurface. The icy regolith can contain films of unfrozen water due to the presence of …

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Preservation and degradation of ancient organic matter in mid-Miocene Antarctic permafrost

Marjolaine Verret, Sebastian Naeher, Denis Lacelle, Catherine Ginnane et autres

The Antarctic environment is amongst the coldest and driest environments on Earth. The ultraxerous soils in the McMurdo Dry Valleys support exclusively microbial communities, however, 15 million years ago, a tundra ecosystem analogous to present-day southern Greenland occupied this region. The occurrence …

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Hydrochemistry of hillslope permafrost catchments with degrading and stable ice-wedge polygons, Ogilvie Mountains, Yukon, Canada

Emmanuel Carrière, Roxanne Frappier, Jean Bjornson, Denis Lacelle

Ice-wedge polygonal terrain is one of the most widespread landscapes in continuous permafrost, and at many locations, is undergoing substantial degradation. Set in central Yukon, this study investigates the hydrochemistry of two hillslope subcatchments, one with degrading and one with stable ice-wedge …

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Comment on egusphere-2025-786

Marjolaine Verret, Sebastian Naeher, Denis Lacelle, Catherine Ginnane et autres

Abstract. The Antarctic environment is amongst the coldest and driest environments on Earth. The ultraxerous soils in the McMurdo Dry Valleys support exclusively microbial communities, however, 15 million years ago, a tundra ecosystem analogous to present-day southern Greenland occupied this region. The …

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QT Interval, Antipsychotics and Correlates Among Patients with Schizophrenia: Cross-Sectional Data from the Multicentric Real-World FACE-SZ

Mona Gerentes, Mohamed Lajnef, Andreı̈ Szöke, Bruno Aouizerate et autres

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Supplementary material to "Preservation and degradation of ancient organic matter in mid-Miocene Antarctic permafrost"

Marjolaine Verret, Sebastian Naeher, Denis Lacelle, Catherine Ginnane et autres

Preservation and degradation of ancient organic matter in mid-Miocene Antarctic permafrost

Marjolaine Verret, Sebastian Naeher, Denis Lacelle, Catherine Ginnane et autres

Abstract. The Antarctic environment is amongst the coldest and driest environments on Earth. The ultraxerous soils in the McMurdo Dry Valleys support exclusively microbial communities, however, 15 million years ago, a tundra ecosystem analogous to present-day southern Greenland occupied this region. The …

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Early Pleistocene glacier ice preserved in permafrost in the eastern Canadian Arctic

Stéphanie Coulombe, Daniel Fortier, Denis Lacelle, Guillaume St‐Onge et autres

Abstract Extensive amounts of glacier ice can be buried and preserved in the permafrost for thousands to millions of years under favorable conditions. Here, we combine sedimentological, cryostratigraphic, and geochemical techniques together with radiocarbon and paleomagnetic dating to show that relict early …

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Permafrost and ground-ice conditions in the Untersee Oasis, Queen Maud Land, East Antarctica

Denis Lacelle, Marjolaine Verret, Benoit Faucher, David Fisher et autres

Abstract Knowledge of Antarctic permafrost is mainly derived from the Antarctic Peninsula and Victoria Land. This study examines the 2019–2023 temperature and humidity conditions, distribution and development of polygonal terrain and the origin of ground ice in soils of the Untersee Oasis. …

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Antarctic ground ice in a changing climate

Marjolaine Verret, Denis Lacelle, Warren Dickinson, David Fisher et autres

Ground ice is one of permafrost's most important and dynamic geologic components.Its occurrence and distribution are essential to understand landscape evolution.Early investigations of permafrost and ground ice in the McMurdo Dry Valleys of Antarctica identified ice-cemented permafrost, ice wedges, buried glacier ice, …

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Ground ice content of the frozen active layer and near-surface permafrost in the Rankin Inlet area, Nunavut, Canada

Benoit Faucher, A -M LeBlanc, Greg A. Oldenborger, Emmanuel Carrière et autres

In the context of climate change, the distribution and amount of ground ice in permafrost is critical to evaluate surface disturbances and geohazard risks.Ground ice conditions are poorly defined in northwestern Hudson Bay in the central Canadian Arctic, an area with renewed …

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Palaeo-environmental significance of evaporative calcite crusts in the Untersee Oasis, East Antarctica

Denis Lacelle, Michelle Christy, Benoit Faucher, P. Sobrón et autres

Abstract Secondary carbonate precipitates on the surface of clasts have rarely been reported from Antarctica. Here, we infer the origin, age and palaeo-environmental significance of the calcite crusts in the Untersee Oasis, East Antarctica. The distribution of calcite crusts, which are up …

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