BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:Evaluating anthropogenic environmental changes from the north and south coasts of Greenland - Dr. Bianca B. Perren\, British Antarctic Surve y DTSTART:20140923T091500Z DTEND:20140923T100000Z UID:TALK52573@talks.cam.ac.uk CONTACT:Dr. Ailsa Benton DESCRIPTION:Understanding the Holocene/Anthropocene transition along the G reenland coastal margin is important not only for constraining the pattern s of environmental variability globally\, but also for evaluating the magn itude of recent changes within a longer-term perspective. Diatoms are a wi dely used tool for reconstructing Holocene environmental changes\, as they are ubiquitous\, well-preserved\, sensitive to a range of environmental v ariables\, and can be used to faithfully reconstruct climatically-relevant lake characteristics over time. Here\, two diatom-based records of contra sting anthropogenic change from Greenland are presented: one from the nort hernmost lake in the world\, on the north coast (Kaffeklubben Sø\, 83ºN) and one from Lake Igaliku (61ºN)\, adjacent to a Norse site in southern Greenland. In the North\, recent warming has resulted in ice-free conditio ns (post-1920 AD) that are unprecedented in the context of the last few mi llennia. In the south\, recent agricultural development (post-1975 AD) has fundamentally altered the nutrient dynamics of the lake. These recent cha nges are unprecedented in the Holocene history of the lake\, but also cont rast the more muted paleoecological footprint of the Norse landnám (986-1 450 AD). Both records show marked anthropogenic changes\, but by entirely different pathways (climate vs. land use). The records also demonstrate ho w diatoms from lake sediments can be used to evaluate the nuances of human perturbations to the high latitude environment within a longer-term persp ective. LOCATION:room 307\, British Antarctic Survey\, High Cross\, Cambridge\, C B3 0ET END:VEVENT END:VCALENDAR