Methane emission dynamics among CO2-absorbing and thermokarst lakes of a great Arctic delta

The water ecosystems of the Arctic region are most vulnerable to modern climatic changes since the global biogeochemical processes mostly occur on the territories of the permafrost zone. Aquatic ecosystems show a high degree of sensitivity to climatic changes; both in these and in other ecosystems, the biogeochemical processes are intense. These water bodies are located in the permafrost zone, which is vulnerable to temperature increases. The paper gives new insights into the fundamental research question of how fast the organic matter of thawing permafrost can be converted to greenhouse gases emitted into the atmosphere (CO2, CH4). We aimed to assess the microbial response and the associated release of CO2 and CH4 from the Arctic lakes in response to temperature increase. We investigated lakes located in the Lena River delta in the Samoylov Island, Russia, at 72° 22′ N, 126° 28′ E. Bottom sediments from three thermokarst and three oxbow lakes were anaerobically incubated in the laboratory at two temperature regimes (at 4 °C and at 25 °C). All the oxbow lakes have shown similar dynamics of methane emission both at low temperatures (4 °C) and at high temperatures (25 °C). The shift of carbon isotopic composition in methane has indicated that methane is emitted in all the oxbow lakes with a similar composition of microbial communities. In the thermokarst lakes, the emission of methane in the sediments proceeded differently at low and at high temperatures. These results have indicated a dissimilar composition of methanogenic / methanotrophic populations in the thermokarst and oxbow lakes. In both cases, the temperature increase caused a growth in methane emission from the sediments of the Arctic lakes. The thermokarst lakes will make a greater contribution to methane emission than the oxbow lakes. Thus, it is believed that the emission of methane from the thermokarst lakes will rise from 6 to 46 times due to ambient temperature increase. Methane emission from the oxbow lakes will grow from 1.8 to 7.6 times. Our results suggest that with the global warming both thermokarst and oxbow lakes could become a great source of methane emission into the atmosphere.

Download Full-text

Focus on Thermokarst Lakes in Indian Himalaya: Inception and Implication under Warming Climate

Journal of Climate Change ◽

10.3233/jcc200012 ◽

2020 ◽

Vol 6 (2) ◽

pp. 59-69

Author(s):

Pratima Pandey ◽

S. Nawaz Ali ◽

Vikram Sharma ◽

Prashant K. Champati Ray

Keyword(s):

Western Himalaya ◽

High Mountain ◽

Thermokarst Lakes ◽

Glacial Environments ◽

Global Warming Scenario ◽

Scientific Attention ◽

Topographic Depressions ◽

Permafrost Thawing ◽

The Impact ◽

Thaw Lakes

Thermokarst (Thaw) lakes are landforms found in topographic depressions created by thawing ground ice in permafrost zones. They play an important role in the regulation of climatic functions. These lakes are a manifestation of warming surface temperatures that accelerates the ice-rich permafrost to degrade by creating marshy hollows/ponds. In the current global warming scenario, the thermokarst lakes in the high mountain regions (Himalaya) are expected to grow further. This accelerate permafrost thawing which will affect the carbon cycle, hydrology and local ecosystems. This phenomenon has attracted huge scientific attention because it has led to a rapid mass change of glaciers in the region, including extensive changes occurring on peri-glacial environments. The most striking fact is the release of an enormous amount of greenhouse gases, including methane, carbon dioxide and nitrous oxide that is locked in these lakes. The present study delves into the thermokarst lakes in the upper reaches of Chandra Valley and Western Himalaya. The study also aims at designating the impact of their changes on the ecosystem, particularly their influence on the atmospheric greenhouse gas concentrations.

Download Full-text

Diatoms in bottom sediments of thermokarst lakes of the Pechora Delta

Issues of modern algology (Вопросы современной альгологии) ◽

10.33624/2311-0147-2019-2(20)-285-290 ◽

2019 ◽

pp. 285-290

Author(s):

Elvira A. Zinnatova, Larisa A. Frolova ◽

Larisa A. Frolova

Keyword(s):

Bottom Sediments ◽

Environmental Conditions ◽

Sources Of Information ◽

Thermokarst Lakes ◽

Thermokarst Lake ◽

Fouling Organisms ◽

Diatom Complexes

The Northern lakes are good objects for paleoclimatic reconstructions. One of the sources of information about changes in the ecosystems of lakes are diatoms. The study of diatom complexes revealed 133 taxa belonging to 49 genera, 24 families, 13 orders and 3 classes in the bottom sediments of the thermokarst lake of the Pechora Delta. Dominated by the Holarctic representatives of benthic and fouling organisms giving preference to the alkaline environmental conditions.

Download Full-text

Forecast of Methane Emission on the Working Face at Coal Seam Mining

Occupational Safety in Industry ◽

10.24000/0409-2961-2017-6-31-35 ◽

2017 ◽

Vol 6 ◽

pp. 31-35

Author(s):

V.S. Zaburdayev ◽

Keyword(s):

Coal Seam ◽

Methane Emission ◽

Working Face ◽

Seam Mining

Download Full-text

Methane Emission from the Broken-down Coal in the Working Face

Occupational Safety in Industry ◽

10.24000/0409-2961-2019-11-13-17 ◽

2019 ◽

pp. 13-17

Author(s):

V.S. Zaburdayev ◽

Keyword(s):

Methane Emission ◽

Working Face

Download Full-text

Influence of the Bachatsky Earthquake on Methane Emission in Roadways in Coal Mines

Journal of Mining Science ◽

10.1134/s1062739119056051 ◽

2019 ◽

Vol 55 (5) ◽

pp. 695-700 ◽

Cited By ~ 1

Author(s):

M. V. Kurlenya ◽

M. N. Tsupov ◽

A. V. Savchenko

Keyword(s):

Methane Emission ◽

Coal Mines

Download Full-text

Biogeochemistry of macrophytes, sediments and porewaters in thermokarst lakes of permafrost peatlands, western Siberia

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.144201 ◽

2021 ◽

Vol 763 ◽

pp. 144201

Author(s):

Rinat M. Manasypov ◽

Oleg S. Pokrovsky ◽

Liudmila S. Shirokova ◽

Yves Auda ◽

Nadezhda S. Zinner ◽

...

Keyword(s):

Western Siberia ◽

Thermokarst Lakes

Download Full-text

Effects of Sericea Lespedeza on Feed Intake, Digestion, and Ruminal Methane Emission in Hair Sheep

Journal of Animal Science ◽

10.1093/jas/skab096.075 ◽

2021 ◽

Vol 99 (Supplement_2) ◽

pp. 41-41

Author(s):

Luana L Ribeiro ◽

Ryszard Puchala ◽

Arthur L Goetsch

Keyword(s):

Methane Emission ◽

Feed Intake ◽

Dry Matter ◽

Coconut Oil ◽

Mixed Effects ◽

Repeated Measure ◽

Lespedeza Cuneata ◽

Hair Sheep ◽

Initial Body Weight ◽

Sericea Lespedeza

Abstract Eighteen Katahdin (initial body weight of 74 kg; SEM=1.8) and 18 St. Croix ewes (55 kg; SEM=1.3) were used in an experiment with four 6-wk periods to determine effects of dietary level of Sericea lespedeza (Lespedeza cuneata) containing 5.8% condensed tannins (dry matter; DM) and other supplemental ingredients on feed intake, digestion, and ruminal methane emission. Diets were consumed ad libitum and included a concentrate supplement at 0.45% BW (DM). Alfalfa was the basal forage for control (CON), ionophore (ION; lasalocid at 33 mg/kg DM), coconut oil (3%; CCO), and soybean oil (3%; SBO) diets, and forage in moderate- and high-lespedeza diets was a 1:1 mixture of alfalfa and lespedeza and all lespedeza, respectively (MSL and HSL, respectively). Data were analyzed with a 2 x 6 factorial arrangement of treatments, period as a repeated measure, and a mixed effects model. Digestion and methane emission were determined in weeks 4, 10, 16, and 22. Total DM intake was similar among treatments (P = 0.070) but numerically greatest for HSL (1,197, 1,297, 1,491, 1,203, 1,195, and 1,207 g/d; SEM=81.1), OM digestibility ranked (P < 0.05) CON, ION, CCO, and SBO > MSL > HSL (69.2, 57.6, 50.3, 66.3, 66.0, and 68.7%; SEM=1.57), and digestible OM intake was similar among treatments (P = 0.517; 697, 607, 589, 598, 635, and 690 g/d for CON, MSL, HSL, ION, CCO, and SBO, respectively; SEM=50.4). There were no interactions involving time in ruminal methane emission, which was greatest among treatments for CON (P < 0.05) in MJ/d (1.39, 0.93, 0.90, 0.92, 0.85, and 0.96; SEM=0.069) and relative to digestible energy intake (20.6, 15.7, 16.8, 16.1, 13.7, and 13.9% for CON, MSL, HSL, ION, CCO, and SBO, respectively; SEM=1.223). In conclusion, dietary inclusion of Sericea lespedeza may offer a natural and sustainable means of decreasing ruminal methane emission by hair sheep as previously shown in goats, with a magnitude of impact similar to that of some other supplemental dietary ingredients.

Download Full-text