Temperature patterns over the past eight centuries in Northern Fennoscandia inferred from sedimentary diatoms

Establishing natural climate variability becomes particularly important in remote polar regions, especially when considering questions regarding higher than average warming. We present a high-resolution record of temperature variability for the past 800 yr based on sedimentary diatoms from a treeline lake in Finnish Lapland. The BSiZer multiscale smoothing technique is applied to the data to identify significant features in the record at different temporal levels. The overall reconstruction shows relatively large multi-centennial temperature variability with a total range of about 0.6–0.8°C. At millennial scales, the temperatures exhibit a statistically significant long-term cooling trend prior to industrialization (Δ T = −0.03°C/century). At the centennial timescale, three warm time intervals were identified around AD 1200–1300 (terminal phase of the Medieval Warm Period, MWP), 1380–1550 and from 1920 until the present. Pronounced coolness occurred between AD 1600 and 1920, indicative of the Little Ice Age (LIA). At the decadal level, certain shorter-term climate excursions were revealed. The warmest ∼10–30 yr, non-overlapping periods occurred in AD 1220–1250, 1470–1500 and 1970–2000, respectively. The classic events of MWP and LIA are evident in our record, as is also the 20th century warming.

Archaeology · Centennial · Climate change · Climatology · Geography · Little ice age · Period (music) · Physical geography · Range (aeronautics) · Sedimentary rock · Climate change and permafrost · Geology · Geology and Paleoclimatology Research · Oceanography · Paleontology · Tree-ring climate responses

• Diatom-inferred total phosphorus from dystrophic Lake Arapisto, Finland, in relation to Holocene paleoclimate

  Open Access•Tomi P Luoto, Liisa Nevalainen et al.•Quaternary Research•2012

  Incluir item

• Late-Quaternary summer temperature changes in the northern-European tree-line region

  Open Access•Heikki Seppä, Glen M Macdonald et al.•Quaternary Research•2008

  Incluir item

• Decadal-scale autumn temperature reconstruction back to AD 1580 inferred from the varved sediments of Lake Silvaplana (Southeastern Swiss Alps)

  Open Access•Alex Blass, Christian Bigler et al.•Quaternary Research•2007

  Incluir item

• Last nine-thousand years of temperature variability in Northern Europe

  Open Access•Heikki Seppä, Anne E Bjune et al.•Climate of the Past•2009

  Incluir item

• Non-proportional preservation of algal and invertebrate remains in freshwater sediments

  Open Access•Anton A Zharov, Alexey A Kotov et al.•Quaternary International•2026

  Incluir item

• Palaeohydrological changes and human-impact history over the last millennium recorded at Lake Joux in the Jura Mountains, Switzerland

  Open Access•M Magny, Emilie Gauthier et al.•The Holocene•2008

  Incluir item

• High-resolution reconstruction of wetness dynamics in a southern boreal raised bog, Finland, during the late Holocene

  Open Access•Minna Väliranta, Atte Korhola et al.•The Holocene•2007

  Incluir item

• Multiproxy evidence of `Little Ice Age' palaeoenvironmental changes in a peat bog from northern Poland

  Open Access•Francois De Vleeschouwer, Natalia Piotrowska et al.•The Holocene•2009

  Incluir item

• Late-Holocene summer temperature reconstruction from chironomid assemblages of Lake Anterne, northern French Alps

  Open Access•Laurent Millet, Fabien Arnaud et al.•The Holocene•2009

  Incluir item

• Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake

  Open Access•Shyhrete Shala, Karin F Helmens et al.•The Holocene•2017

  Incluir item

• Response of freshwater diatoms to cold events in the Late Pleistocene and Early Holocene (SE Baltic region)

  Open Access•Andrej Spiridonov, Giedrė Vaikutienė et al.•Quaternary International•2021

  Incluir item

• A ∼13,000-year paleolimnological record from the Uinta Mountains, Utah, inferred from diatoms and loss-on-ignition analysis

  Open Access•A H Tingstad, K A Moser et al.•Quaternary International•2011

  Incluir item

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

  Open Access•Tomi P Luoto, Antti E K Ojala et al.•Polar Record•2019

  Incluir item

• A Quantitative Holocene Climatic Record from Diatoms in Northern Fennoscandia

  Open Access•Atte Korhola, Jan Weckström et al.•Quaternary Research•2000

  Incluir item

• Radiocarbon Geochemistry of Modern and Ancient Arctic Lake Systems, Baffin Island, Canada

  Open Access•Mark B Abbott, Thomas W Stafford•Quaternary Research•1996

  Incluir item

• Global surface temperatures over the past two millennia

  Open Access•M Mann, Michael E Mann et al.•Geophysical Research Letters•2003

  Incluir item

• The calculation of lead-210 dates assuming a constant rate of supply of unsupported 210Pb to the sediment

  Open Access•P G Appleby, Frank Oldfield•CATENA•1978

  Incluir item

• Global-scale temperature patterns and climate forcing over the past six centuries

  Open Access•M Mann, Michael E Mann et al.•Nature•1998

  Incluir item

• Determination of the number of zones in a biostratigraphical sequence

  Open Access•K D Bennett•New Phytologist•1996

  Incluir item

• Northern hemisphere temperatures during the past millennium

  Open Access•M Mann, Michael E Mann et al.•Geophysical Research Letters•1999

  Incluir item

• Highly variable Northern Hemisphere temperatures reconstructed from low- and high-resolution proxy data

  Open Access•Anders Moberg, D M Sonechkin et al.•Nature•2005

  Incluir item

• Diatoms and pH reconstruction

  Open Access•H J B Birks, C j f Ter Braak et al.•Philosophical transactions of the…•1990

  Incluir item

• Numerical methods in quaternary pollen analysis

  H J B Birks•Numerical methods in quaternary…•1985

  Incluir item

• Diatom community responses to late-Holocene climatic variability, Baffin Island, Canada

  Alexander P Wolfe•The Holocene•2003

  Incluir item

• The supra-long Scots pine tree-ring record for Finnish Lapland

  Open Access•Samuli Helama, Markus Lindholm et al.•The Holocene•2002

  Incluir item

• High-resolution palaeoclimatic records for the last millennium

  Open Access•P D Jones, Keith R Briffa et al.•The Holocene•1998

  Incluir item

• Holocene climatic change reconstructed from diatoms, chironomids, pollen and near-infrared spectroscopy at an alpine lake (Sjuodjijaure) in northern Sweden

  Open Access•Peter Rosén, Ulf Segerström et al.•The Holocene•2001

  Incluir item

• Quantitative multiproxy assessment of long-term patterns of Holocene environmental change from a small lake near Abisko, northern Sweden

  Open Access•Christian Bigler, Isabelle Larocque et al.•The Holocene•2002

  Incluir item

• Diatom community responses to late-Holocene climatic variability, Baffin Island, Canada

  A P Wolfe•The Holocene•2003

  Incluir item

• The ‘Little Ice Age’ – only temperature

  Open Access•Atle Nesje, Svein Olaf Dahl•The Holocene•2003

  Incluir item

• The use of chironomid remains for AMS 14C dating of lake sediments

  Open Access•Vivienne J Jones, R W Battarbee et al.•The Holocene•1993

  Incluir item