A 5500-year oxygen isotope record of high arctic environmental change from southern Spitsbergen

• Published in: The Holocene
• Main Authors: Arppe, Laura, Kurki, Eija, Wooller, Matthew J., Luoto, Tomi P., Zajaczkowski, Marek, Ojala, Antti E. K.
• Other Authors: Finnish Museum of Natural History, Stable Isotope Systematics
• Format: Article in Journal/Newspaper
• Language: English
• Published: SAGE Publications Ltd STM 2019
• Subjects: Arctic; climate; "Little Ice Age'; North Atlantic; oxygen isotopes; Spitsbergen; Svalbard; temperature; HOLOCENE GLACIER FLUCTUATIONS; NORTH-ATLANTIC CLIMATE; EAST GREENLAND CURRENT; LAKE-WATER DELTA-O-18; SVALBARD ICE CORE; SEA-ICE; HIGH-RESOLUTION; PALEOCLIMATE RECONSTRUCTION; TEMPERATURE VARIABILITY; LATE-PLEISTOCENE; 1171 Geosciences; East Greenland; east greenland current; glacier; Greenland; ice core; Sea ice
• Online Access: http://hdl.handle.net/10138/307946

The oxygen isotope composition of chironomid head capsules in a sediment core spanning the past 5500 years from Lake Svartvatnet in southern Spitsbergen was used to reconstruct the oxygen isotope composition of lake water (O-18(lw)) and local precipitation. The O-18(lw) values display shifts from the baseline variability consistent with the timing of recognized historical climatic episodes, such as the Roman Warm Period, the Dark Ages Cold Period and the Little Ice Age'. The highest values of the record, ca. 3 parts per thousand above modern O-18(lw) values, occur at ca. 1900-1800 cal. yr BP. Three negative excursions increasing in intensity toward the present, at 3400-3200, 1250-1100, and 350-50 cal. yr BP, are tentatively linked to roughly synchronous episodes of increased glacier activity and general cold spells around the northern North Atlantic. Their manifestation in the Svartvatnet O-18(lw) record not only testify to the sensitivity and potential of high Arctic lacustrine O-18(chir) records in tracking terrestrial climate evolution but also highlight nonlinear dynamics within the northern North Atlantic hydroclimatic system. The Little Ice Age' period at 350-50 cal. yr BP displays a remarkable 8-9 parts per thousand drop in O-18(lw) values, construed to predominantly represent significantly decreased winter temperatures during a period of increased seasonal differences and extended sea ice cover inducing changes in moisture source regions. Peer reviewed