Massive crater under Greenland’s ice points to climate-altering impact in the time of humans

The first ice core drilling in Greenland was carried out in by the U. The drilling took place at Site 2 and was part of the preparations for the International Geophysical Year in With the Site 2 ice core Chester C. Langway from SIPRE initiated the modern era of multi disciplinary ice core studies including detailed isotope profiles. The first ice core drilling through the Greenland ice cap was performed from to at the American subsurface military facility Camp Century. Stable isotope measurements revealed a climate curve reaching far into the glacial. Motivated by this success, a new drill was developed and used to retrieve a more than 2 km long ice core from the DYE-3 drill site in Southern Greenland. Read more about the development of deep drilling from the very beginning until the end of the s.

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To support our nonprofit science journalism, please make a tax-deductible gift today. Soon, his target came into view: Hiawatha Glacier, a slow-moving sheet of ice more than a kilometer thick. It advances on the Arctic Ocean not in a straight wall, but in a conspicuous semicircle, as though spilling out of a basin.

The helicopter landed near the surging river that drains the glacier, sweeping out rocks from beneath it. What he brought home clinched the case for a grand discovery. Hidden beneath Hiawatha is a kilometer-wide impact crater, big enough to swallow Washington, D.

An ice core is a core sample that is typically removed from an ice sheet or a high mountain Greenland ice cores contain layers of wind-blown dust that correlate with cold, dry from NEEM, a previous Greenland ice core drilling site, to the EastGRIP site. Radiocarbon dating can be used on the carbon in trapped CO 2​.

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East Greenland ice core dust record reveals timing of Greenland ice sheet advance and retreat

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History of ice core drilling in Greenland

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Exposing the sensitivity of the Greenland Ice Sheet GrIS to Holocene climate changes is a key prerequisite for understanding the future response of the ice sheet to global warming. We use 10 Be and in-situ 14 C exposure dating to constrain the timing of deglaciation in the area and radiocarbon dating of reworked molluscs and wood fragments to constrain when the ice sheet retreated behind its present-day extent. The 10 Be ages are scattered ranging from c.

Based on the few reliable 10 Be ages, the in-situ 14 C ages and existing radiocarbon ages from Inglefield Land, we find that the deglaciation along the coast commenced c. The ice margin reached its present-day position c. Radiocarbon ages of reworked molluscs and wood fragments show that the ice margin was behind its present-day extent from c.

After 0. Our results emphasize that the slowly eroding and possibly cold-based ice in north Greenland makes it difficult to constrain the deglaciation history based on 10 Be ages alone unless it is paired with in-situ 14 C ages. Further, combining our findings with those of recently published studies reveals distinct differences between deglaciation patterns of northwest and north Greenland.

Deglaciation of the land areas in northwest Greenland occurred earlier than in north Greenland and periods of restricted ice extent were longer, spanning middle and late Holocene. Overall, this highlights past ice sheet sensitivity towards Holocene climate changes in an area where little information was available just a few years ago. Annales Geophysicae.

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Tourism to Kalatdlit Nunat Greenland is being promoted as a “New Adventure in Tourism” and eyed by the government as a source of much-needed outside revenue and local employment to support the new economic demands generated by the semi-independence from Denmark. Unlike elsewhere, Greenlandic tourism is a conscious indigenous strategy and may well be an added stimulus to national ethnicity.

Greenland, the world’s largest island, was initially peopled 4, years ago by Inuits Eskimos. Four hundred years of minimal Viking settlement dating to AD apparently had little permanent effect. The rediscovery of Greenland by European whalers and missionaries in the 17th century initiated limited culture change. German occupation of Denmark during World War II brought Greenland under American protection, and its strategic importance led to construction of four major airstrips.

After the War, to prevent “contamination” of native culture, Denmark closed Greenland to civilian outsiders and restricted military personnel to their bases. Simultaneously, the Danes began to upgrade housing and social services, and expand educational opportunities.

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