scholarly journals Greenhouse gas production and lipid biomarker distribution in Yedoma and Alas thermokarst lake sediments in Eastern Siberia

2021 ◽  
Author(s):  
Loeka L. Jongejans ◽  
Susanne Liebner ◽  
Christian Knoblauch ◽  
Kai Mangelsdorf ◽  
Mathias Ulrich ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Lake Sediments ◽  
Gas Production ◽  
Eastern Siberia ◽  
Thermokarst Lake ◽  
Lipid Biomarker

scholarly journals Plant Litter Type Dictates Microbial Communities Responsible for Greenhouse Gas Production in Amended Lake Sediments

2018 ◽  
Vol 9 ◽  
Author(s):  
Kurt M. Yakimovich ◽  
Erik J. S. Emilson ◽  
Michael A. Carson ◽  
Andrew J. Tanentzap ◽  
Nathan Basiliko ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Greenhouse Gas ◽  
Lake Sediments ◽  
Gas Production ◽  
Plant Litter ◽  
Litter Type

scholarly journals Organic carbon characteristics in yedoma and thermokarst deposits on Baldwin Peninsula, West-Alaska

2018 ◽  
Author(s):  
Loeka L. Jongejans ◽  
Jens Strauss ◽  
Josefine Lenz ◽  
Francien Peterse ◽  
Kai Mangelsdorf ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Lake Sediments ◽  
Lake Basin ◽  
Study Region ◽  
Thermokarst Lake ◽  
Discontinuous Permafrost ◽  
Lipid Biomarker ◽  
Biomarker Analysis ◽  
Thawing Permafrost

Abstract. As Arctic warming continues and permafrost thaws, more soil and sedimentary organic carbon (OC) will be decomposed in northern high latitudes. Still, uncertainties remain in the quantity and quality of OC stored in different deposit types of permafrost landscapes. This study presents OC data from deep permafrost and lake deposits on the Baldwin Peninsula which is located in the southern portion of the continuous permafrost zone in West Alaska. Sediment samples from yedoma and drained thermokarst lake basin (DTLB) deposits as well as thermokarst lake sediments were analyzed for cryostratigraphical and biogeochemical parameters and their lipid biomarker composition to identify the size and quality of belowground OC pools in ice-rich permafrost on Baldwin Peninsula. We provide the first detailed characterization of yedoma deposits on Baldwin Peninsula. We show that three quarters of soil organic carbon in the frozen deposits of the study region (total of 68 Mt) is stored in DTLB deposits (52 Mt) and one quarter in the frozen yedoma deposits (16 Mt). The lake sediments contain a relatively small OC pool (4 Mt), but have the highest volumetric OC content (93 kg/m3) compared to the DTLB (35 kg/m3) and yedoma deposits (8 kg/m3), largely due to differences in the ground ice content. The biomarker analysis indicates that the OC in both yedoma and DTLB deposits is mainly of terrestrial origin. Nevertheless, the relatively high carbon preference index of plant leaf waxes in combination with a lack of degradation trend with depth in the yedoma deposits indicates that OC stored in yedoma is less degraded than that stored in DTLB deposits. This suggests that OC in yedoma has a higher potential for decomposition upon thaw, despite the relatively small size of this pool. These findings highlight the importance of molecular OC analysis for determining the potential future greenhouse gas emissions from thawing permafrost, especially because this area close to the discontinuous permafrost boundary is projected to thaw substantially within the 21st century.

scholarly journals Greenhouse gas production in low-latitude lake sediments responds strongly to warming

2014 ◽  
Vol 4 (6) ◽  
pp. 467-470 ◽  
Author(s):  
H. Marotta ◽  
L. Pinho ◽  
C. Gudasz ◽  
D. Bastviken ◽  
L. J. Tranvik ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Lake Sediments ◽  
Gas Production ◽  
Low Latitude

scholarly journals Organic matter characteristics in yedoma and thermokarst deposits on Baldwin Peninsula, west Alaska

2018 ◽  
Vol 15 (20) ◽  
pp. 6033-6048 ◽  
Author(s):  
Loeka L. Jongejans ◽  
Jens Strauss ◽  
Josefine Lenz ◽  
Francien Peterse ◽  
Kai Mangelsdorf ◽  
...  
Keyword(s):  
Organic Matter ◽  
Lake Sediments ◽  
Lake Basin ◽  
Study Region ◽  
Thermokarst Lake ◽  
Discontinuous Permafrost ◽  
Lipid Biomarker ◽  
Biomarker Analysis ◽  
Thawing Permafrost

Abstract. As Arctic warming continues and permafrost thaws, more soil and sedimentary organic matter (OM) will be decomposed in northern high latitudes. Still, uncertainties remain in the quality of the OM and the size of the organic carbon (OC) pools stored in different deposit types of permafrost landscapes. This study presents OM data from deep permafrost and lake deposits on the Baldwin Peninsula which is located in the southern portion of the continuous permafrost zone in west Alaska. Sediment samples from yedoma and drained thermokarst lake basin (DTLB) deposits as well as thermokarst lake sediments were analyzed for cryostratigraphical and biogeochemical parameters and their lipid biomarker composition to identify the belowground OC pool size and OM quality of ice-rich permafrost on the Baldwin Peninsula. We provide the first detailed characterization of yedoma deposits on Baldwin Peninsula. We show that three-quarters of soil OC in the frozen deposits of the study region (total of 68 Mt) is stored in DTLB deposits (52 Mt) and one-quarter in the frozen yedoma deposits (16 Mt). The lake sediments contain a relatively small OC pool (4 Mt), but have the highest volumetric OC content (93 kg m−3) compared to the DTLB (35 kg m−3) and yedoma deposits (8 kg m−3), largely due to differences in the ground ice content. The biomarker analysis indicates that the OM in both yedoma and DTLB deposits is mainly of terrestrial origin. Nevertheless, the relatively high carbon preference index of plant leaf waxes in combination with a lack of a degradation trend with depth in the yedoma deposits indicates that OM stored in yedoma is less degraded than that stored in DTLB deposits. This suggests that OM in yedoma has a higher potential for decomposition upon thaw, despite the relatively small size of this pool. These findings show that the use of lipid biomarker analysis is valuable in the assessment of the potential future greenhouse gas emissions from thawing permafrost, especially because this area, close to the discontinuous permafrost boundary, is projected to thaw substantially within the 21st century.

scholarly journals Dissolved organic carbon, CO2, and CH4 concentrations and their stable isotope ratios in thermokarst lakes on the Qinghai-Tibetan Plateau

2016 ◽  
Author(s):  
Cuicui Mu ◽  
Tingjun Zhang ◽  
Qingbai Wu ◽  
Xiaoqing Peng ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Tibetan Plateau ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Greenhouse Gas ◽  
Lake Sediments ◽  
Thermal Stratification ◽  
Gas Production ◽  
Stable Isotope Ratios ◽  
Thermokarst Lakes

<p>Thermokarst lakes are widely distributed on the Qinghai-Tibetan Plateau (QTP), which accounts for 8% of the global permafrost area. These lakes probably promote organic matter biodegradation and thus accelerate the emission of carbon-based greenhouse gases. However, little is known about greenhouse gas concentrations and their stable isotopes characteristics of these lakes. In this study, we measured the concentrations of dissolved organic carbon (DOC), dissolved CO<sub>2</sub> and CH<sub>4</sub>, as well as the distribution of δ<sup>13</sup>C<sub>C</sub><sub>O2</sub>, δ<sup>13</sup>C<sub>C</sub><sub>H4</sub>, and δ<sup>13</sup>C<sub>OM</sub> (organic matter) of lake sediments in thermokarst lakes on the QTP. Results showed that the OM of the lake sediments was highly decomposed. The concentrations of DOC, CO<sub>2</sub> and CH<sub>4</sub> in the lake water on the QTP were 1.2–49.6 mg L<sup>–1</sup>, 3.6–45.0 μmol L<sup>–1</sup> and 0.28–3.0 μmol L<sup>–1</sup>, respectively. The highest CO<sub>2</sub> and CH<sub>4</sub> concentrations were recorded in July while the lowest values in September, which suggested that temperature had an effect on greenhouse gas production, although this pattern may also relate to thermal stratification of the water column. The results implied that thermokast lakes should be paid more attention to regarding carbon cycle and greenhouse gas emissions on the QTP.</p>

Processes affecting greenhouse gas production in experimental boreal reservoirs

2013 ◽  
Vol 27 (2) ◽  
pp. 567-577 ◽  
Author(s):  
Jason J. Venkiteswaran ◽  
Sherry L. Schiff ◽  
Vincent L. St. Louis ◽  
Cory J. D. Matthews ◽  
Natalie M. Boudreau ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Gas Production

A model-based approach to measuring denitrification and greenhouse gas production in lakes

2021 ◽  
Author(s):  
Juliet Falco Ajambo-Doherty
Keyword(s):  
Greenhouse Gas ◽  
Atmospheric Pressure ◽  
Schmidt Number ◽  
Spatial Scales ◽  
Gas Production ◽  
System Model ◽  
Biogeochemical Processes ◽  
Model Based ◽  
Temporal And Spatial ◽  
System Metabolism

An existing whole-system model based on changes in dissolved N₂ concentration was modified for lentic systems. Field validations carried out at Christie Lake in Dundas, ON and Turtle Pond in Stoney Creek, ON (Canada). New model inputs included air temperature, atmospheric pressure, relative humidity, wind velocity, and Schmidt number. Mont Carlo analysis was integrated into the model to better constrain error in model estimates of denitrification, whole-system metabolism, and greenhouse gas production. Denitrification rates ranged from -419-4415 µmol N.m-².h-¹ in Christie Lake and from 10-74 µmol N.m-².h-¹ in Turtle Pond. N₂O production ranged from 915-10,635 nmol N.m-².h-¹ in Christie Lake and from -344-131 nmol N.m-².h-¹ in Turtle Pond. The whole-system model allows for the examination of biogeochemical processes at ecologically significant temporal and spatial scales.

scholarly journals Soil structure and greenhouse gas production differences between row and interrow positions under no-tillage

2014 ◽  
Vol 71 (2) ◽  
pp. 157-162 ◽  
Author(s):  
Alvaro Pires da Silva ◽  
Bruce C. Ball ◽  
Cássio Antonio Tormena ◽  
Neyde Fabiola Balarezo Giarola ◽  
Rachel Muylaert Locks Guimarães
Keyword(s):  
Greenhouse Gas ◽  
Soil Structure ◽  
Gas Production ◽  
No Tillage
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