Rapid 20th century environmental change on northeastern Baffin Island,Arctic Canada inferred from a multi-proxy lacustrine record |
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| Authors: | Elizabeth K Thomas Yarrow Axford Jason P Briner |
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| Institution: | (1) Department of Geology, University at Buffalo, Buffalo, NY 14260, USA |
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| Abstract: | The Arctic has a disproportionately large response to changes in radiative forcing of climate, and arctic lacustrine ecosystems
respond sensitively to these changes. The goal of this research is to generate high-resolution climate records for the past
two millennia using multiple proxies in order to place 20th and 21st century climate and environmental change into a long-term
context. We use a 14C- and 210Pb-dated surface core from Lake CF8 on northeastern Baffin Island, Arctic Canada to generate a high-resolution multiproxy
reconstruction of climate and environmental change. Throughout the late Holocene, primary productivity in Lake CF8 was low,
but increased almost 20-fold in the past 200 years. Insect (Chironomidae) assemblages also show dramatic changes since 1950
AD, with cold stenothermous chironomid taxa disappearing from the record altogether. These changes in productivity and chironomid
assemblages are unprecedented in the past 5,000 years. The dramatic ecological shifts that occurred at Lake CF8 have also
been observed elsewhere in the Arctic, and will likely continue at ever-increasing rates as anthropogenic inputs of green
house gases continue to cause climate warming and enhanced lacustrine primary production. |
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| Keywords: | Chironomids Climate change Late Holocene Anthropocene Arctic Lake sediments Paleolimnology |
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