scholarly journals Formation of frost boils in peat plateau of the Pur-Taz interfluve at the background of modern climate warming

2019 ◽  
pp. 42-51
Author(s):  
E. S. Koroleva ◽  
Ya. V. Tikhonravova ◽  
V. P. Mel’nikov ◽  
E. A. Slagoda ◽  
E. A. Babkina ◽  
...  
Keyword(s):  
Organic Matter ◽  
Active Layer ◽  
Cross Sections ◽  
Lower Layer ◽  
West Siberia ◽  
The North ◽  
Southern Tundra ◽  
Thaw Depth ◽  
Observation Period ◽  
Structure Properties

In 2016-2017, we have detected numerous organic frost boils on the surface of khasyrey peat plateau in the southern tundra part of Pur-Taz interfluve (the north of West Siberia). They are related to the microrelief depressions in polygons and to the swales between tussocks. Cross-sections, cryogenic structure, properties of peat in active layer (moisture, density, heaving, chemical composition) and peat distribution within the khasyreys were studied. In the active layer, we distinguished soil and vegetation cover, upper and middle solid layers of weakly decomposed peat, lower layer of a well decomposed peat. Under the microrelief depressions, the top of permafrost is lowered, thickness and moisture of decomposed peat is increased due to the recent thawing in comparison to the elevated parts of polygons. In the cross-sections of seasonally thawing peat, we determined injections of organic matter from the lower layer of peat to the surface. We propose the mechanism of organic frost boils formation in peat plateau due to the injections during the summer seasons of 2016-2018 against the increase of a thaw depth without freezing. During the observation period, the amount of frost boils on polygonal peat plateau was found to increase.

Distribution of organic matter in rocks of the Bazhenov horizon ( West Siberia )

2018 ◽  
Vol 59 (3) ◽  
pp. 285-298 ◽  
Author(s):  
A.E. Kontorovich ◽  
E.V. Ponomareva ◽  
L.M. Burshtein ◽  
V.N. Glinskikh ◽  
N.S. Kim ◽  
...  
Keyword(s):  
Organic Matter ◽  
West Siberia ◽  
Bazhenov Horizon

A multiproxy record of sedimentation, pedogenesis, and environmental history in the north of West Siberia during the late Pleistocene based on the Belaya Gora section

2020 ◽  
pp. 1-19
Author(s):  
Vladimir Sheinkman ◽  
Sergey Sedov ◽  
Lyudmila S. Shumilovskikh ◽  
Elena Bezrukova ◽  
Dmitriy Dobrynin ◽  
...  
Keyword(s):  
Environmental History ◽  
Boreal Forests ◽  
West Siberia ◽  
Northern Eurasia ◽  
Partial Recovery ◽  
Radiocarbon Dates ◽  
Oxygen Isotope Stage ◽  
Mis 3 ◽  
The North ◽  
Mis 5

Abstract Recent revision of the Pleistocene glaciation boundaries in northern Eurasia has encouraged the search for nonglacial geological records of the environmental history of northern West Siberia. We studied an alluvial paleosol-sedimentary sequence of the high terrace of the Vakh River (middle Ob basin) to extract the indicators of environmental change since Marine Oxygen Isotope Stage (MIS) 6. Two levels of the buried paleosols are attributed to MIS 5 and MIS 3, as evidenced by U/Th and radiocarbon dates. Palynological and pedogenetic characteristics of the lower pedocomplex recorded the climate fluctuations during MIS 5, from the Picea-Larix taiga environment during MIS 5e to the establishment of the tundra-steppe environment due to the cooling of MIS 5d or MIS 5b and partial recovery of boreal forests with Picea and Pinus in MIS 5c or MIS 5a. The upper paleosol level shows signs of cryogenic hydromorphic pedogenesis corresponding to the tundra landscape, with permafrost during MIS 3. Boulders incorporated in a laminated alluvial deposit between the paleosols are dropstones brought from the Enisei valley by ice rafting during the cold MIS 4. An abundance of eolian morphostructures on quartz grains from the sediments that overly the upper paleosol suggests a cold, dry, and windy environment during the MIS 2 cryochron.

Arctic Permafrost Active Layer Detachments Stimulate Microbial Activity and Degradation of Soil Organic Matter

2010 ◽  
Vol 44 (11) ◽  
pp. 4076-4082 ◽  
Author(s):  
Brent G. Pautler ◽  
André J. Simpson ◽  
David J. Mcnally ◽  
Scott F. Lamoureux ◽  
Myrna J. Simpson
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Microbial Activity ◽  
Active Layer

Sinking organic matter spreads the nitrogen isotope signal of pelagic denitrification in the North Pacific

2009 ◽  
Vol 36 (8) ◽  
Author(s):  
Daniel M. Sigman ◽  
Peter J. DiFiore ◽  
Mathis P. Hain ◽  
Curtis Deutsch ◽  
David M. Karl
Keyword(s):  
Organic Matter ◽  
North Pacific ◽  
Nitrogen Isotope ◽  
The North ◽  
The North Pacific

scholarly journals Evaluation of the Moisture Sources in two Extreme Landfalling Atmospheric River Events using an Eulerian WRF-Tracers tool

2017 ◽  
Author(s):  
Jorge Eiras-Barca ◽  
Francina Dominguez ◽  
Huancui Hu ◽  
A. Daniel Garaboa-Paz ◽  
Gonzalo Miguez-Macho
Keyword(s):  
Cross Sections ◽  
North Atlantic ◽  
Cold Front ◽  
Wrf Model ◽  
Atmospheric River ◽  
The North ◽  
Northern Latitudes ◽  
The Pacific ◽  
Low Level Jet ◽  
Tropical Moisture

Abstract. A new 3D Tracer tool is coupled to the WRF model to analyze the origin of the moisture in two extreme Atmospheric River (AR) events: the so-called Great Coast Gale of 2007 in the Pacific Basin, and the Great Storm of 1987 in the North Atlantic. Results show that between 80 % and 90 % of the moisture advected by the ARs, as well as between 70 % and 80 % of the associated precipitation have a tropical or subtropical origin. Local convergence transport is responsible for the remaining moisture and precipitation. The ratio of tropical moisture to total moisture is maximized as the cold front arrives to land. Vertical cross sections of the moisture suggest that the maximum in humidity does not necessarily coincide with the Low-Level Jet (LLJ) of the extratropical cyclone. Instead, the amount of tropical humidity is maximized in the lowest atmospheric level in southern latitudes, and can be located above, below or ahead the LLJ in northern latitudes in both analyzed cases.

Transformation of soil organic matter in microarthropod community from the northern taiga of west Siberia

2006 ◽  
Vol 33 (1) ◽  
pp. 81-86 ◽  
Author(s):  
V. G. Mordkovich ◽  
O. G. Berezina ◽  
I. I. Lyubechanskii ◽  
V. S. Andrievskii ◽  
I. I. Marchenko
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
West Siberia ◽  
Northern Taiga ◽  
Microarthropod Community
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