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Increasing Alkalinity Export from Large Russian Arctic Rivers.

https://arctichealth.org/en/permalink/ahliterature292546
Source
Environ Sci Technol. 2018 Jun 27; :
Publication Type
Journal Article
Date
Jun-27-2018
Author
Travis Drake
Suzanne E Tank
Alexander V Zhulidov
Robert Max Holmes
Tatiana Yu Gurtovaya
Robert G M Spencer
Source
Environ Sci Technol. 2018 Jun 27; :
Date
Jun-27-2018
Language
English
Publication Type
Journal Article
Abstract
Riverine carbonate alkalinity (HCO3- and CO32-) sourced from chemical weathering represents a significant sink for atmospheric CO2. Alkalinity flux from Arctic rivers is partly determined by precipitation, permafrost extent, groundwater flow paths, and surface vegetation, all of which are changing under a warming climate. Here we show that over the past three and half decades, the export of alkalinity from the Yenisei and Ob' Rivers increased from 225 to 642 Geq yr-1 (+185%) and from 201 to 470 Geq yr-1 (+134%); an average rate of 11.90 and 7.28 Geq yr-1, respectively. These increases may have resulted from a suite of changes related to climate change and anthropogenic activity, including higher temperatures, increased precipitation, permafrost thaw, changes to hydrologic flow paths, shifts in vegetation, and decreased acid deposition. Regardless of the direct causes, these trends have broad implications for the rate of carbon sequestration on land and delivery of buffering capacity to freshwater ecosystems and the Arctic Ocean.
PubMed ID
29947507 View in PubMed
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Low and declining mercury in arctic Russian rivers.

https://arctichealth.org/en/permalink/ahliterature264135
Source
Environ Sci Technol. 2014;48(1):747-52
Publication Type
Article
Date
2014
Author
Leandro Castello
Alexander V Zhulidov
Tatiana Yu Gurtovaya
Richard D Robarts
Robert M Holmes
Daniel A Zhulidov
Vladimir S Lysenko
Robert G M Spencer
Source
Environ Sci Technol. 2014;48(1):747-52
Date
2014
Language
English
Publication Type
Article
Keywords
Animals
Arctic Regions
Environmental monitoring
Gadiformes
Mercury - analysis
Rivers - chemistry
Russia
Water Pollutants, Chemical - analysis
Abstract
Mercury (Hg) dynamics in the Arctic is receiving increasing attention, but further understanding is limited by a lack of studies in Russia, which encompasses the majority of the pan-Arctic watershed. This study reports Hg concentrations and trends in burbot (Lota lota) from the Lena and Mezen Rivers in the Russian Arctic, and assesses the extent to which they differ from those found in burbot in arctic rivers elsewhere. Mercury concentrations in burbot in the Lena and Mezen Rivers were found to be generally lower than in 23 other locations, most of which are in the Mackenzie River Basin (Canada). Mercury concentrations in burbot in the Lena and Mezen Rivers also were found to have been declining at an annual rate of 2.3% while they have been increasing in the Mackenzie River Basin at annual rates between 2.2 and 5.1% during roughly the same time period. These contrasting patterns in Hg in burbot across the pan-Arctic may be explained by geographic heterogeneity in controlling processes, including riverine particulate material loads, historically changing atmospheric inputs, postdepositional processes, and climate change impacts.
PubMed ID
24358967 View in PubMed
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Temporal and Longitudinal Mercury Trends in Burbot (Lota lota) in the Russian Arctic.

https://arctichealth.org/en/permalink/ahliterature286827
Source
Environ Sci Technol. 2017 Nov 03;
Publication Type
Article
Date
Nov-03-2017
Author
Alexander R Pelletier
Leandro Castello
Alexander V Zhulidov
Tatiana Yu Gurtovaya
Richard D Robarts
Robert M Holmes
Daniel A Zhulidov
Robert G M Spencer
Source
Environ Sci Technol. 2017 Nov 03;
Date
Nov-03-2017
Language
English
Publication Type
Article
Abstract
Current understanding of mercury (Hg) dynamics in the Arctic is hampered by a lack of data in the Russian Arctic region, which comprises about half of the entire Arctic watershed. This study quantified temporal and longitudinal trends in total mercury (THg) concentrations in burbot (Lota lota) in eight rivers of the Russian Arctic between 1980 and 2001, encompassing an expanse of 118 degrees of longitude. Burbot THg concentrations declined by an average of 2.6% annually across all eight rivers during the study period, decreasing by 39% from 0.171 µg g(-1) wet weight (w.w.) in 1980 to 0.104 µg g(-1) w.w. in 2001. THg concentrations in burbot also declined by an average of 1.8% per 10° of longitude from west to east across the study area between 1988 and 2001. These results, in combination with those of previous studies, suggest that Hg trends in Arctic freshwater fishes before 2001 were spatially and temporally heterogeneous, as those in the North American Arctic were mostly increasing while those in the Russian Arctic were mostly decreasing. It is suggested that Hg trends in Arctic animals may be influenced by both depositional and postdepositional processes.
PubMed ID
29083154 View in PubMed
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Temporal and Longitudinal Mercury Trends in Burbot (Lota lota) in the Russian Arctic.

https://arctichealth.org/en/permalink/ahliterature292342
Source
Environ Sci Technol. 2017 Nov 21; 51(22):13436-13442
Publication Type
Journal Article
Date
Nov-21-2017
Author
Alexander R Pelletier
Leandro Castello
Alexander V Zhulidov
Tatiana Yu Gurtovaya
Richard D Robarts
Robert M Holmes
Daniel A Zhulidov
Robert G M Spencer
Author Affiliation
Virginia Polytechnic Institute and State University , Blacksburg, Virginia 24061, United States.
Source
Environ Sci Technol. 2017 Nov 21; 51(22):13436-13442
Date
Nov-21-2017
Language
English
Publication Type
Journal Article
Keywords
Animals
Arctic Regions
Environmental monitoring
Fishes
Mercury
Russia
Water Pollutants, Chemical
Abstract
Current understanding of mercury (Hg) dynamics in the Arctic is hampered by a lack of data in the Russian Arctic region, which comprises about half of the entire Arctic watershed. This study quantified temporal and longitudinal trends in total mercury (THg) concentrations in burbot (Lota lota) in eight rivers of the Russian Arctic between 1980 and 2001, encompassing an expanse of 118 degrees of longitude. Burbot THg concentrations declined by an average of 2.6% annually across all eight rivers during the study period, decreasing by 39% from 0.171 µg g-1 wet weight (w.w.) in 1980 to 0.104 µg g-1 w.w. in 2001. THg concentrations in burbot also declined by an average of 1.8% per 10° of longitude from west to east across the study area between 1988 and 2001. These results, in combination with those of previous studies, suggest that Hg trends in Arctic freshwater fishes before 2001 were spatially and temporally heterogeneous, as those in the North American Arctic were mostly increasing while those in the Russian Arctic were mostly decreasing. It is suggested that Hg trends in Arctic animals may be influenced by both depositional and postdepositional processes.
PubMed ID
29083154 View in PubMed
Less detail