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Arctic snow cover shows sharp decline

Posted by Hannah

Earlier spring could spell trouble for permafrost Arctic snow is fading fast. June snow cover in the Northern Hemisphere has dropped by almost 18% per decade during the past 30 years, according to a study published in Geophysical Research Letters1. The drop in snow extent will lower the amount of sunlight reflected away from the planet — a process that has a cooling effect — by exposing darker and less reflective soil, shrubs and trees, which absorb solar radiation and re-emit the heat into the atmosphere. The change also stands to warm the permafrost, alter the timing of spring runoff into … Read more…

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Regime Change: Q&A with John Smol

Posted by Hannah

Nature A freshwater ecologist at Queen’s University in Kingston, Ontario, Canada, Smol studies lake sediments to understand climatic and environmental change. Nature Outlook asks him to share his experience. What can we learn from lake sediments? One of the biggest challenges in environmental science is the lack of long-term data, so we have to use indirect proxies. All over the planet, lakes act as passive samplers of the environment, recording information 24 hours a day. They contain biological, chemical and physical information. The deeper you go in the sediment, the older it gets. Typically, in North America you can go back … Read more…

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Frozen Assets

Posted by Hannah

Maclean’s Ice cores tell the history of Canada’s climate, but now the government doesn’t want them anymore.

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Canada’s ice cores seek new home

Posted by Hannah

Confusion over fate of valuable climate record chills researchers. An unusual ‘help wanted’ advertisement arrived in the inboxes of Canadian scientists last week. The e-mail asked the research community to provide new homes for an impressive archive of ice cores representing 40 years of research by government scientists in the Canadian Arctic. The note was sent out by Christian Zdanowicz, a glaciologist at the Geological Survey of Canada (GSC) in Ottawa. He claimed that the collection faced destruction owing to budget cuts at Natural Resources Canada (NRCan), the government department that runs the survey, and a “radical downsizing” of the Ice Core … Read more…

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Plants flowering later on the Tibetan Plateau

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Shorter growing season linked to warmer winters on ‘the roof of the world’. In many regions, climate change has advanced the timing of spring events, such as flowering or the unfolding of leaves. But the meadows and steppes of the Tibetan Plateau are bucking that trend — plants are starting to bloom later in spring, making the growing season shorter. This change could threaten the livelihood of the thousands of nomads who survive by raising cattle on the plateau. “I’ve worked in the Tibetan Plateau region for 25 years,” says Jianchu Xu, an ethnoecologist at the World Agroforestry Centre in … Read more…