In these interactive webmaps, you can explore the Laurentide Ice Sheet through time. The maps are based on the shapefiles and datasets produced by Dalton et al. 2023. The maps are based on a radiocarbon chronology and are presented in calibrated thousands of years before present (cal. ka BP). The Last Glacial Maximum This map […]
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By Jakob Hamann Introduction: timescale and climate setting at the Last Glacial Maximum The Last Glacial Maximum (LGM) marks the coldest interval of the most recent glacial period, occurring between approximately 26,000 and 20,000 years ago. During this time, global temperatures were substantially lower than today, and large ice sheets reached their maximum extent across
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By Jakob Hamann Introduction Large parts of North America have been covered by glaciers and ice sheets in the past. Over roughly the last 2.6 million years – an interval known as the Quaternary Period1 – glaciers advanced and retreated repeatedly as climate shifted between colder and warmer conditions2. During colder intervals, ice sheets expanded
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What are cascade hazards? Cascade hazards can occur when more than one hazard interact. Primary hazards (e.g. avalanches and landslides) can often trigger secondary hazards (e.g. flooding and debris flows). As a result, the impacts are extended further downstream 1,2. Cascade hazards are difficult to predict and even harder to model 4 , therefore are
Glacial lake hazards | Flooding | Case Study 1 | Case Study 2 | Summary Increasing glacial lakes In recent decades glacial lake hazards have increased due to accelerated glacial mass loss and retreat leading to the expansion of existing glacial lakes and formation of new lakes 1,2. As a result, glacial lakes now exist
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Bethan Davies, Newcastle University The melting of one of North America’s largest icefields has accelerated and could soon reach an irreversible tipping point. That’s the conclusion of new research colleagues and I have published on the Juneau Icefield, which straddles the Alaska-Canada border near the Alaskan capital of Juneau. In the summer of 2022, I
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Introduction | Case study 1 | Case study 2 | Summary What is glacial surging? Glacial surging refers to the sudden movement of ice over a relatively short period of time resulting in rapid glacier advance that is different from the usual glacier activity 1. Examples of surging can be found across the world, e.g.
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Introduction | Mass Movements | Rockfall and Avalanches | Ice and snow avalanches | Landslide and debris flow | Case Study What are glacial hazards? Generally, there are two types of hazards found in glacial environments that can impact humans. First, we have direct hazards such as avalanches and rockfalls. Second, we have indirect hazards
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By Alex Hyde The sub-tropical glaciers of Bhutan Bhutan is a small mountainous nation located in the Eastern Himalaya, with a population of around 727 000 people (Figure 1). The country has a sub-tropical climate in its south, where it borders lowland plains, and a Himalayan subalpine climate to the north where it meets the
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This article is based on the followed accepted and published article on Juneau Icefield geomorphology and glaciology: Davies et al., 20221, which has been published in final form at: https://doi.org/10.1002/esp.5383 Article authors: Bethan Davies, Jacob Bendle, Jonathan Carrivick, Robert McNabb, Christopher McNeil, Mauri Pelto, Seth Campbell, Tom Holt, Jeremy Ely, Bradley Markle In this article,
Plateau Icefields: Glacial geomorphology of Juneau Icefield Read More »
