Proxy-based 300-year High Arctic climate warming record from Svalbard

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http://hdl.handle.net/10138/312442

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Luoto , T P , Ojala , A E K & Zajaczkowski , M 2019 , ' Proxy-based 300-year High Arctic climate warming record from Svalbard ' , Polar Record , vol. 55 , no. 3 , pp. 132-141 . https://doi.org/10.1017/S0032247419000275

Title: Proxy-based 300-year High Arctic climate warming record from Svalbard
Author: Luoto, Tomi P.; Ojala, Antti E. K.; Zajaczkowski, Marek
Contributor: University of Helsinki, Ecosystems and Environment Research Programme
Date: 2019-05
Language: eng
Number of pages: 10
Belongs to series: Polar Record
ISSN: 0032-2474
URI: http://hdl.handle.net/10138/312442
Abstract: We used fossil Chironomidae assemblages and the transfer function approach to reconstruct summer air temperatures over the past 300 years from a High Arctic lake in Hornsund, Svalbard. Our aims were to compare reconstructed summer temperatures with observed (last 100 years) seasonal temperatures, to determine a potential climate warming break point in the temperature series and to assess the significance and rate of the climate warming trend at the study site. The reconstructed temperatures were consistent with a previous proxy record from Svalbard and showed good correlation with the meteorological observations from Bjornoya and Longyearbyen. From the current palaeoclimate record, we found a significant climate warming threshold in the 1930s, after which the temperatures rapidly increased. We also found that the climate warming trend was strong and statistically significant. Compared with the reconstructed Little Ice Age temperatures in late eighteenth century cooling culmination, the present day summer temperatures are >4 degrees C higher and the temperature increase since the 1930s has been 0.5 degrees C per decade. These results highlight the exceptionally rapid recent warming of southern Svalbard and add invaluable information on the seasonality of High Arctic climate change and Arctic amplification.
Subject: Arctic amplification
Chironomidae
Climate change
Palaeoclimatology
Palaeolimnology
Temperature
LATE HOLOCENE CLIMATE
ENVIRONMENTAL-CHANGE
ICE-AGE
TEMPERATURE RECONSTRUCTION
LAST MILLENNIUM
CHIRONOMIDAE INSECTA
AIR-TEMPERATURE
DATA-SET
LAKE
VARIABILITY
1181 Ecology, evolutionary biology
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