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tundra

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Journal Article
Published: 14 September 2018
Geochemistry: Exploration, Environment, Analysis (2019) 19 (2): 138–145.
... of those in the acidic rocks is much lower, at 2%, 0.012 and 0.015% respectively. According to soil geographical zoning of the mountain systems of Russia, the investigated areas belong to the Polar class, Subarctic subclass, stony barren (golets)-tundra type zonality, where the lower belt...
FIGURES
Journal Article
Published: 01 February 2016
Vadose Zone Journal (2016) 15 (2): vzj2015.05.0068.
... equivalent analogs that can be used in uncertainty and sensitivity analyses. We apply the technique to four polygonal tundra sites near Barrow, Alaska that are part of the Department of Energy’s Next-Generation Ecosystem Experiments (NGEE)–Arctic project. The ROM is trained for each site using simulated soil...
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Journal Article
Journal: Geophysics
Published: 21 January 2016
Geophysics (2016) 81 (1): WA247–WA263.
... and high-resolution examination of the distribution and nature of shallow permafrost in the Arctic tundra, including the estimation of ice content, porosity, and salinity. Among other results, porosity in the top 2 m varied between 85% (besides ice wedges) and 40%, and was negatively correlated with fluid...
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Journal Article
Published: 03 July 2013
Canadian Journal of Earth Sciences (2013) 50 (9): 967–977.
... tundra areas may be drying, which, if true, may have important implications for carbon balance. Our observations may be the result of changes in winter conditions in combination with low permafrost ice content in the region, in part explaining regional variations in responses to climate change...
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Journal Article
Published: 01 February 2013
Vadose Zone Journal (2013) 12 (1): vzj2012.0058.
... of the experimental catchments were 3.1 and 1.2 ha for C1 and C2, respectively, and 0.4 and 3.2 ha for A1 and A2, respectively. Tundra vegetation at CBAWO is heterogeneous and varies by drainage conditions and landscape position. The vegetation communities can be broadly classified as barren ground, polar semi...
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Journal Article
Published: 30 March 2012
Canadian Journal of Earth Sciences (2012) 49 (8): 877–894.
...M.J. Palmer; C.R. Burn; S.V. Kokelj Abstract Air and near-surface ground temperatures, late-winter snow conditions, and characteristics of the vegetation cover and soil were measured across the forest–tundra transition in the uplands east of the Mackenzie Delta, Northwest Territories, in 2004–2010...
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Journal Article
Journal: The Leading Edge
Published: 01 August 2009
The Leading Edge (2009) 28 (8): 936–942.
..., for example, crews cannot set up camp until the state Department of Natural Resources (DNR) declares “the tundra open to off-road travel.” This means that along the coastal region, the snow cover must meet the 15-cm rule (6 inches) and the ground must be frozen so permitted vehicles can operate without...
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Journal Article
Published: 15 January 2009
Canadian Journal of Earth Sciences (2008) 45 (11): 1221–1234.
... air temperature and sunshine during the growing season (June–July–August–September) were reconstructed from pollen assemblages using the modern analogue technique. The vegetation of the Last Interglacial period evolved from a prostrate dwarf-shrub tundra to a low- and high-shrub tundra vegetation...
Journal Article
Journal: Geology
Published: 01 July 2008
Geology (2008) 36 (7): 567–570.
... in the same mine. The unique combination of clays, oil, and brine into which the animals had sunk is responsible for their almost perfect preservation. During the late Pleistocene winters, when the ice and snow cover was present in the tundra “paleoswamp,” areas of inflow of brines, oils, and hydrocarbon...
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Journal Article
Published: 07 November 2007
Canadian Journal of Earth Sciences (2007) 44 (11): 1503–1515.
... ridge–trough sequences. At spruce forest sites, near-surface ground cooling rates and minimum near-surface temperatures from the years 2003–2005 were above ice-wedge cracking thresholds. Ground thermal conditions associated with cracking were recorded at a tundra peatland with active ice wedges. Annual...
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Journal Article
Published: 01 November 2007
Vadose Zone Journal (2007) 6 (4): 694–704.
...Ronald P. Daanen; Debasmita Misra; Howard Epstein Abstract Patterned-ground features are common throughout arctic tundra ecosystems and develop as a result of intricate relationships among climate, hydrology, vegetation, and soil processes. Changes in the annual energy budget induced by climatic...
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Journal Article
Published: 11 July 2007
Canadian Journal of Earth Sciences (2007) 44 (6): 733–743.
...Ming-ko Woo; Michael Mollinga; Sharon L. Smith Abstract The variability of maximum active layer thickness in boreal and tundra environments has important implications for hydrological processes, terrestrial and aquatic ecosystems, and the integrity of northern infrastructure. For most planning...
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Journal Article
Published: 01 May 2007
Geochemistry: Exploration, Environment, Analysis (2007) 7 (2): 98.
... by the Association of Applied Geochemists, was attended by over 200 delegates from 19 countries. Its theme, ‘ From Tropics to Tundra’ , aimed to cater for presenters and registrants from a wide variety of geographical and geological environments and to embrace a range of topics in applied geochemistry. It attracted...
Journal Article
Published: 20 April 2007
Canadian Journal of Earth Sciences (2007) 44 (3): 287–296.
... indicated by the taxa range from boreal forest to tundra; taxa are an in situ assemblage with little transport or reworking. Although this site has yielded the richest fossil record of this age yet found in Ontario, previous finds at a few sites on the north edge of the eastern Erie basin...
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Journal Article
Published: 01 March 2007
Journal of the Geological Society (2007) 164 (2): 317–322.
... fossil plants that, along with evidence from fossil insects, invertebrates and palaeosols, indicate the existence of tundra conditions at 85°S during the Neogene. Mean annual temperatures of c . −12 °C are estimated, with short summer seasons with temperatures up to +5 °C. The current published date...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2399(14)
... sediment deposition occurred between ∼13,000 and 12,220 yr B.P. during a period of tundra vegetation, which ended with a sharp rise in spruce needle abundance and a shift to autochthonous marl and finally peat deposition. Fossils of aquatic and wetland plants began to accumulate before the tundra-spruce...
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Journal Article
Journal: The Leading Edge
Published: 01 October 2004
The Leading Edge (2004) 23 (10): 1055–1060.
... imaging the geologic objective, a seismic survey must be designed to address subsistence and environmental concerns. To minimize damage to the fragile tundra, seismic data acquisition is restricted to the winter months. The length of time that crews are allowed to operate varies from year to year...
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Journal Article
Published: 20 November 2002
Canadian Journal of Earth Sciences (2002) 39 (11): 1657–1674.
... associated with vegetation growth has been the dominant control on variation in active-layer thickness and not summer weather conditions, which are well correlated with thaw depths along an active-layer course established in the adjacent tundra. Changes in elevation of the surface of the lake bed have been...
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Journal Article
Published: 27 August 2002
Canadian Journal of Earth Sciences (2002) 39 (8): 1281–1298.
... considerable disturbance to the surrounding continuous permafrost. Water and lake-bottom temperatures, the configuration of permafrost, and active-layer thickness were measured at a tundra lake between 1992 and 1997. The lake is oval, 1.6 km long, 800 m wide, and as deep as 13 m. Sandy terraces, covered...
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Journal Article
Published: 11 January 2002
Canadian Journal of Earth Sciences (2002) 39 (1): 95–111.
...J. Ross Mackay; C.R. Burn Abstract In August 1978, a large tundra lake was drained to study the aggradation of permafrost into newly exposed lake-bottom sediments. Ice-wedge growth, which started in the first winter following drainage, had ceased in most of the lake bottom within about twelve years...
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