A 538-Year Record of Climate and Treeline Dynamics from the Lower Lena River Region of Northern Siberia, Russia

1998 ◽  
Vol 30 (4) ◽  
pp. 334 ◽  
Author(s):  
G. M. MacDonald ◽  
R. A. Case ◽  
J. M. Szeicz
Keyword(s):  
Lena River ◽  
Northern Siberia ◽  
River Region

Chrysophyte stomatocyst flora from a forest peat core in the Lena River Region, northeastern Siberia

Nova Hedwigia ◽  
1997 ◽  
Vol 64 (3-4) ◽  
pp. 311-352 ◽  
Author(s):  
Sarah Gilbert ◽  
Barbara A. Zeeb ◽  
John P. Smol
Keyword(s):  
Lena River ◽  
Peat Core ◽  
Northeastern Siberia ◽  
River Region

scholarly journals The exchange of carbon dioxide between wet arctic tundra and the atmosphere at the Lena River Delta, Northern Siberia

2007 ◽  
Vol 4 (3) ◽  
pp. 1953-2005 ◽  
Author(s):  
L. Kutzbach ◽  
C. Wille ◽  
E.-M. Pfeiffer
Keyword(s):  
Carbon Dioxide ◽  
Ecosystem Respiration ◽  
Co2 Exchange ◽  
River Delta ◽  
Active Period ◽  
Net Ecosystem Co2 Exchange ◽  
Lena River ◽  
Northern Siberia ◽  
Gross Photosynthesis ◽  
Lena River Delta

Abstract. The exchange fluxes of carbon dioxide between wet arctic polygonal tundra and the atmosphere were investigated by the micrometeorological eddy covariance method. The investigation site was situated in the centre of the Lena River Delta in Northern Siberia (72°22' N, 126°30' E). The study region is characterized by a polar and distinctly continental climate, very cold and ice-rich permafrost and its position at the interface between the Eurasian continent and the Arctic Ocean. The soils at the site are characterized by high organic matter content, low nutrient availability and pronounced water logging. The vegetation is dominated by sedges and mosses. The micrometeorological campaigns were performed during the periods July–October 2003 and May–July 2004 which included the period of snow and soil thaw as well as the beginning of soil refreeze. The main CO2 exchange processes, the gross photosynthesis and the ecosystem respiration, were found to be of a generally low intensity. The gross photosynthesis accumulated to –432 g m−2 over the photosynthetically active period (June–September). The contribution of mosses to the gross photosynthesis was estimated to be about 40%. The diurnal trend of the gross photosynthesis was mainly controlled by the incoming photosynthetically active radiation. During midday the photosynthetic apparatus of the canopy was frequently near saturation and represented the limiting factor on gross photosynthesis. The synoptic weather conditions strongly affected the exchange fluxes of CO2 by changes in cloudiness, precipitation and pronounced changes of air temperature. The ecosystem respiration accumulated to +327 g m−2 over the photosynthetically active period, which corresponds to 76% of the CO2 uptake by photosynthesis. However, the ecosystem respiration continued at substantial rates during autumn when photosynthesis had ceased and the soils were still largely unfrozen. The temporal variability of the ecosystem respiration during summer was best explained by an exponential function with surface temperature, and not soil temperature, as the independent variable. This was explained by the major role of the plant respiration within the CO2 balance of the tundra ecosystem. The wet polygonal tundra of the Lena River Delta was observed to be a substantial CO2 sink with an accumulated net ecosystem CO2 exchange of –119 g m−2 over the summer and an estimated annual net ecosystem CO2 exchange of –71 g m−2.

Holocene Paleohydrology and Paleoclimate at Treeline, North-Central Russia, Inferred from Oxygen Isotope Records in Lake Sediment Cellulose

2000 ◽  
Vol 53 (3) ◽  
pp. 319-329 ◽  
Author(s):  
Brent B. Wolfe ◽  
Thomas W. D. Edwards ◽  
Ramon Aravena ◽  
Steven L. Forman ◽  
Barry G. Warner ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Sediment Cores ◽  
Taimyr Peninsula ◽  
Nordic Seas ◽  
Lena River ◽  
Summer Insolation ◽  
Central Russia ◽  
River Region ◽  
Northern Russia ◽  
Western Eurasia

AbstractLake-water oxygen-isotope histories for three lakes in northern Russia, derived from the cellulose oxygen-isotope stratigraphies of sediment cores, provide the basis for preliminary reconstruction of Holocene paleohydrology in two regions along the boreal treeline. Deconvolution of shifting precipitation δ18O from secondary evaporative isotopic enrichment is aided by knowledge of the distribution of isotopes in modern precipitation, the isotopic composition of paleo-waters preserved in frozen peat deposits, as well as other supporting paleoclimatic information. These data indicate that during the early Holocene, when the boreal treeline advanced to the current arctic coastline, conditions in the lower Yenisey River region were moist compared to the present, whereas greater aridity prevailed to the east near the lower Lena River. This longitudinal moisture gradient is consistent with the suggestion that oceanic forcing (increased sea-surface temperatures in the Nordic Seas and reduced sea-ice cover) was a major contributor to the development of a more maritime climate in western Eurasia, in addition to increased summer insolation. East of the Taimyr Peninsula, large tracts of the continental shelf exposed by glacial sea-level drawdown may have suppressed maritime climatic influence in what are now coastal areas. In contrast, during the late Holocene the two regions have apparently experienced coherent shifts in effective moisture. The similarity of the records may primarily reflect reduced North Atlantic influence in the Nordic Seas and southward retreat of coastline in eastern Siberia, coupled with declining summer insolation.

The upper boundary of the chekurovskii formation in the stratoregion (Lena river lower reaches): litho– and biostratigraphic criteria

2020 ◽  
Author(s):  
Egor S. Shamonin ◽  
◽  
Oksana S. Dzyuba ◽  
Valery G. Knyazev ◽  
Olga S. Urman ◽  
...  
Keyword(s):  
Lena River ◽  
Northern Siberia ◽  
Facial Region ◽  
Lower Callovian ◽  
Upper Boundary

New paleontological and lithological data characterizing the upper boundary of the Chekurovskii Formation are considered for the stratoregion located in the lower reaches of the Lena River, northern Siberia. We propose to accept this boundary at the bottom of a sandy bed with pebbles, considering the latter to be basal sandstones of an overlying transgressive sequence. Taking into account ammonite records, we can conclude that the boundary corresponds to a level within the Upper Bathonian Catacadoceras barnstoni Zone. The predominantly silt–sized sediments lying above (uppermost Bathonian? – Lower Callovian) can be treated an analogue of a lower part of the Innokent’evka Formation recognized in adjacent facial region.

Spatial and seasonal variability of polygonal tundra water balance: Lena River Delta, northern Siberia (Russia)

2013 ◽  
Vol 21 (1) ◽  
pp. 133-147 ◽  
Author(s):  
Manuel Helbig ◽  
Julia Boike ◽  
Moritz Langer ◽  
Peter Schreiber ◽  
Benjamin R. K. Runkle ◽  
...  
Keyword(s):  
Water Balance ◽  
Seasonal Variability ◽  
River Delta ◽  
Lena River ◽  
Northern Siberia ◽  
Lena River Delta

scholarly journals Trace metal distribution in pristine permafrost-affected soils of the Lena River delta and its hinterland, northern Siberia, Russia

2014 ◽  
Vol 11 (1) ◽  
pp. 1-15 ◽  
Author(s):  
I. Antcibor ◽  
A. Eschenbach ◽  
S. Zubrzycki ◽  
L. Kutzbach ◽  
D. Bolshiyanov ◽  
...  
Keyword(s):  
Trace Metal ◽  
Climatic Changes ◽  
River Delta ◽  
Metal Distribution ◽  
Lena River ◽  
Northern Siberia ◽  
Metal Levels ◽  
Trace Metal Distribution ◽  
Lena River Delta ◽  
Ice Complex

Abstract. Soils are an important compartment of ecosystems and have the ability to buffer and immobilize substances of natural and anthropogenic origin to prevent their movement to other environment compartments. Predicted climatic changes together with other anthropogenic influences on Arctic terrestrial environments may affect biogeochemical processes enhancing leaching and migration of trace elements in permafrost-affected soils. This is especially important since Arctic ecosystems are considered to be highly sensitive to climatic changes as well as to chemical contamination. This study characterises background levels of trace metals in permafrost-affected soils of the Lena River delta and its hinterland in northern Siberia (73.5–69.5° N), representing a remote region far from evident anthropogenic trace metal sources. Investigations on the element content of iron (Fe), arsenic (As), manganese (Mn), zinc (Zn), nickel (Ni), copper (Cu), lead (Pb), cadmium (Cd), cobalt (Co), and mercury (Hg) in different soil types developed in different geological parent materials have been carried out. The highest median concentrations of Fe and Mn were observed in soils belonging to ice-rich permafrost sediments formed during the Pleistocene (ice-complex) while the highest median values of Ni, Pb and Zn were found in soils of both the ice-complex and the Holocene estuarine terrace of the Lena River delta region, as well as in the southernmost study unit of the hinterland area. Detailed observations of trace metal distribution on the micro scale showed that organic matter content, soil texture and iron-oxide contents influenced by cryogenic processes, temperature, and hydrological regimes are the most important factors determining the metal abundance in permafrost-affected soils. The observed range of trace element background concentrations was similar to trace metal levels reported for other pristine northern areas.

scholarly journals The exchange of carbon dioxide between wet arctic tundra and the atmosphere at the Lena River Delta, Northern Siberia

2007 ◽  
Vol 4 (5) ◽  
pp. 869-890 ◽  
Author(s):  
L. Kutzbach ◽  
C. Wille ◽  
E.-M. Pfeiffer
Keyword(s):  
Carbon Dioxide ◽  
Ecosystem Respiration ◽  
Co2 Exchange ◽  
River Delta ◽  
Active Period ◽  
Net Ecosystem Co2 Exchange ◽  
Lena River ◽  
Northern Siberia ◽  
Gross Photosynthesis ◽  
Lena River Delta

Abstract. The exchange fluxes of carbon dioxide between wet arctic polygonal tundra and the atmosphere were investigated by the micrometeorological eddy covariance method. The investigation site was situated in the centre of the Lena River Delta in Northern Siberia (72°22' N, 126°30' E). The study region is characterized by a polar and distinctly continental climate, very cold and ice-rich permafrost and its position at the interface between the Eurasian continent and the Arctic Ocean. The soils at the site are characterized by high organic matter content, low nutrient availability and pronounced water logging. The vegetation is dominated by sedges and mosses. The micrometeorological campaigns were performed during the periods July–October 2003 and May–July 2004 which included the period of snow and soil thaw as well as the beginning of soil refreeze. The main CO2 exchange processes, the gross photosynthesis and the ecosystem respiration, were found to be of a generally low intensity. The gross photosynthesis accumulated to −432 g m−2 over the photosynthetically active period (June–September). The contribution of mosses to the gross photosynthesis was estimated to be about 40%. The diurnal trend of the gross photosynthesis was mainly controlled by the incoming photosynthetically active radiation. During midday, the photosynthetic apparatus of the canopy was frequently near saturation and represented the limiting factor on gross photosynthesis. The synoptic weather conditions strongly affected the exchange fluxes of CO2 by changes in cloudiness, precipitation and pronounced changes of air temperature. The ecosystem respiration accumulated to +327 g m−2 over the photosynthetically active period, which corresponds to 76% of the CO2 uptake by photosynthesis. However, the ecosystem respiration continued at substantial rates during autumn when photosynthesis had ceased and the soils were still largely unfrozen. The temporal variability of the ecosystem respiration during summer was best explained by an exponential function with surface temperature, and not soil temperature, as the independent variable. This was explained by the major role of the plant respiration within the CO2 balance of the tundra ecosystem. The wet polygonal tundra of the Lena River Delta was observed to be a substantial CO2 sink with an accumulated net ecosystem CO2 exchange of −119 g m−2 over the summer and an estimated annual net ecosystem CO2 exchange of −71 g m−2.

Divergent Memories of Tumen Shan-shui

2019 ◽  
pp. 229-10.33526/EJKS.20191901.229
Author(s):  
Xiaoxuan Lu
Keyword(s):  
Lived Experience ◽  
North Korea ◽  
Research Study ◽  
States Of Mind ◽  
Geographical Research ◽  
River Region ◽  
Production Techniques ◽  
Landscape Research ◽  
Border Areas ◽  
The Creation

Focusing on the interplay between memory and place, this article examines the rationale behind the use of axonometric drawings (axons) in a geographical research study of the Tumen/Tuman River region encompassing the borders shared by China, Russia and North Korea. The concepts of “memory of place” and “place of memory” guide the structure of this project and the flow of this article. “Memory of place” emphasises the lived experience of our physical senses, and helps determine the great potential of visual methodologies in the fields of geographical and landscape research and study. Drawn up using the graphic production techniques of abstracting, foregrounding, highlighting and juxtaposing, axons avail themselves of and inform both realist and idealist states of mind. In contrast, “place of memory” references a particular type of materiality and helps us understand Tumen Shan-shui as a library of memories that reveals a profusion of contested aesthetic, cultural and political meanings. Axons serve to tell narratives revealing desires, actions and undertakings that have shaped and continue to shape the substance of the memory sites in question including infrastructure, architecture and signage. Initially adopted by the author as a medium for recording and communicating due to security restrictions imposed in the border areas in question, the creation of axons generated new insights on methods of documentation in landscape research, and the places and landscapes themselves.

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