scholarly journals Major postglacial summer temperature changes in the central coniferous boreal forest of Quebec (Canada) inferred using chironomid assemblages

2018 ◽  
Vol 33 (4) ◽  
pp. 409-420 ◽  
Author(s):  
Lisa Bajolle ◽  
Isabelle Larocque-Tobler ◽  
Emmanuel Gandouin ◽  
Martin Lavoie ◽  
Yves Bergeron ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Summer Temperature ◽  
Temperature Changes ◽  
Chironomid Assemblages ◽  
Coniferous Boreal Forest

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

2008 ◽  
Vol 69 (03) ◽  
pp. 404-412 ◽  
Author(s):  
Heikki Seppä ◽  
Glen M. MacDonald ◽  
H. John B. Birks ◽  
Bruce R. Gervais ◽  
Jeffrey A. Snyder
Keyword(s):  
Kola Peninsula ◽  
Younger Dryas ◽  
Summer Temperature ◽  
The Arctic ◽  
Fossil Pollen ◽  
Tree Line ◽  
Temperature Changes ◽  
The Holocene ◽  
Northern European ◽  
Line Region

We present two new quantitative July mean temperature (Tjul) reconstructions from the Arctic tree-line region in the Kola Peninsula in north-western Russia. The reconstructions are based on fossil pollen records and cover the Younger Dryas stadial and the Holocene. The inferred temperatures are less reliable during the Younger Dryas because of the poorer fit between the fossil pollen samples and the modern samples in the calibration set than during the Holocene. The results suggest that the Younger Dryas Tjulin the region was 8.0–10.0°C, being 2.0–3.0°C lower than at present. The Holocene summer temperature maximum dates to 7500–6500 cal yr BP, with Tjulabout 1.5°C higher than at present. These new records contribute to our understanding of summer temperature changes along the northern-European tree-line region. The Holocene trends are consistent in most of the independent records from the Fennoscandian–Kola tree-line region, with the beginning of the Holocene thermal maximum no sooner than at about 8000 cal yr BP. In the few existing temperature-related records farther east in the Russian Arctic tree line, the period of highest summer temperature begins already at about 10,000 cal yr BP. This difference may reflect the strong influence of the Atlantic coastal current on the atmospheric circulation pattern and the thermal behaviour of the tree-line region on the Atlantic seaboard, and the more direct influence of the summer solar insolation on summer temperature in the region east of the Kola Peninsula.

Rapid summer temperature changes during Termination 1a: high-resolution multi-proxy climate reconstructions from Gerzensee (Switzerland)

2012 ◽  
Vol 36 ◽  
pp. 103-113 ◽  
Author(s):  
André F. Lotter ◽  
Oliver Heiri ◽  
Stephen Brooks ◽  
Jacqueline F.N. van Leeuwen ◽  
Ulrich Eicher ◽  
...  
Keyword(s):  
High Resolution ◽  
Summer Temperature ◽  
Temperature Changes ◽  
Climate Reconstructions

Summer temperature variability inferred from subfossil chironomid assemblages from the south-east margin of the Qinghai–Tibetan Plateau for the last 5000 years

The Holocene ◽  
2017 ◽  
Vol 27 (12) ◽  
pp. 1876-1884 ◽  
Author(s):  
Jie Chang ◽  
Enlou Zhang ◽  
Enfeng Liu ◽  
James Shulmeister
Keyword(s):  
Tibetan Plateau ◽  
Asian Summer Monsoon ◽  
Summer Temperature ◽  
Ice Age ◽  
Western China ◽  
Temperature Record ◽  
Temperature Changes ◽  
Cooling Period ◽  
Climate Event ◽  
Subfossil Chironomid

We present a quantitative mean July temperature record spanning the last c. 5000 years from an alpine lake in south-western China. The reconstruction is based on the application of an established chironomid-based inference model using 100 lakes from the region. The reconstructed summer temperature changes are within 2.4°C of modern throughout the record. The results suggest that the summer temperature changes in south-east margin of the Qinghai–Tibetan plateau (QTP) predominantly responds to Asian Summer Monsoon influence, forced by summer insolation until c. 3200 cal. BP. Four cooling events, each separated by c. 500 years (between 3200 and 1600 cal. BP), were observed and these may correspond to the 500-year quasi-periodic solar fluctuation. The most recent cooling period, that is, ‘the Little Ice Age’, appears robust in the Heihai Lake record, providing further evidence that a hemisphere-wide forcing mechanism is possible for this climate event.

scholarly journals Footprint of temperature changes in the temperate and boreal forest carbon balance

2009 ◽  
Vol 36 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Shilong Piao ◽  
Pierre Friedlingstein ◽  
Philippe Ciais ◽  
Philippe Peylin ◽  
Biao Zhu ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Carbon Balance ◽  
Forest Carbon ◽  
Temperature Changes

scholarly journals Seven Ways a Warming Climate Can Kill the Southern Boreal Forest

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 560
Author(s):  
Lee E. Frelich ◽  
Rebecca A. Montgomery ◽  
Peter B. Reich
Keyword(s):  
Boreal Forest ◽  
Boreal Forests ◽  
Temperate Forest ◽  
Sudden Change ◽  
Wildlife Habitat ◽  
Gradual Change ◽  
Temperate Trees ◽  
Coniferous Boreal Forest ◽  
Understory Trees ◽  
Overstory Trees

The southern boreal forests of North America are susceptible to large changes in composition as temperate forests or grasslands may replace them as the climate warms. A number of mechanisms for this have been shown to occur in recent years: (1) Gradual replacement of boreal trees by temperate trees through gap dynamics; (2) Sudden replacement of boreal overstory trees after gradual understory invasion by temperate tree species; (3) Trophic cascades causing delayed invasion by temperate species, followed by moderately sudden change from boreal to temperate forest; (4) Wind and/or hail storms removing large swaths of boreal forest and suddenly releasing temperate understory trees; (4) Compound disturbances: wind and fire combination; (5) Long, warm summers and increased drought stress; (6) Insect infestation due to lack of extreme winter cold; (7) Phenological disturbance, due to early springs, that has the potential to kill enormous swaths of coniferous boreal forest within a few years. Although most models project gradual change from boreal forest to temperate forest or savanna, most of these mechanisms have the capability to transform large swaths (size range tens to millions of square kilometers) of boreal forest to other vegetation types during the 21st century. Therefore, many surprises are likely to occur in the southern boreal forest over the next century, with major impacts on forest productivity, ecosystem services, and wildlife habitat.

scholarly journals Validation of the Integrated Biosphere Simulator over Canadian deciduous and coniferous boreal forest stands

2001 ◽  
Vol 106 (D13) ◽  
pp. 14339-14355 ◽  
Author(s):  
Mustapha El Maayar ◽  
David T. Price ◽  
Christine Delire ◽  
Jonathan A. Foley ◽  
T. Andrew Black ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Forest Stands ◽  
Integrated Biosphere Simulator ◽  
Coniferous Boreal Forest

Pollen-based summer temperature reconstructions for the eastern Canadian boreal forest, subarctic, and Arctic

2004 ◽  
Vol 23 (18-19) ◽  
pp. 1901-1924 ◽  
Author(s):  
Michael W. Kerwin ◽  
Jonathan T. Overpeck ◽  
Robert S. Webb ◽  
Katherine H. Anderson
Keyword(s):  
Boreal Forest ◽  
Summer Temperature ◽  
Temperature Reconstructions ◽  
Canadian Boreal Forest
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