Structural Characterization of Dissolved Organic Matter in Permafrost Peatland Lakes
Thermokarst lakes result from the thawing of ice-rich permafrost and are widespread across northern landscapes. These waters are strong emitters of methane, especially in permafrost peatland regions, where they are stained black by high concentrations of dissolved organic matter (DOM). In the presen...
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ftmdpi:oai:mdpi.com:/2073-4441/12/11/3059/ 2023-08-20T04:07:04+02:00 Structural Characterization of Dissolved Organic Matter in Permafrost Peatland Lakes Diogo Folhas Armando C. Duarte Martin Pilote Warwick F. Vincent Pedro Freitas Gonçalo Vieira Artur M. S. Silva Regina M. B. O. Duarte João Canário agris 2020-10-31 application/pdf https://doi.org/10.3390/w12113059 EN eng Multidisciplinary Digital Publishing Institute Water Quality and Contamination https://dx.doi.org/10.3390/w12113059 https://creativecommons.org/licenses/by/4.0/ Water; Volume 12; Issue 11; Pages: 3059 permafrost thermokarst peatlands subarctic DOM carbon cycle Text 2020 ftmdpi https://doi.org/10.3390/w12113059 2023-08-01T00:23:28Z Thermokarst lakes result from the thawing of ice-rich permafrost and are widespread across northern landscapes. These waters are strong emitters of methane, especially in permafrost peatland regions, where they are stained black by high concentrations of dissolved organic matter (DOM). In the present study, we aimed to structurally characterize the DOM from a set of peatland thermokarst lakes that are known to be intense sites of microbial decomposition and methane emission. Samples were collected at different depths from three thermokarst lakes in the Sasapimakwananisikw (SAS) River valley near the eastern Hudson Bay community of Kuujjuarapik–Whapmagoostui (Nunavik, Canada). Samples were analyzed by spectrofluorometry, Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and elemental analysis. Fluorescence analyses indicated considerable amounts of autochthonous DOM in the surface waters of one of SAS 1A, indicating a strong bioavailability of labile DOM, and consequently a greater methanogenic potential. The three lakes differed in their chemical composition and diversity, suggesting various DOM transformations phenomena. The usefulness of complementary analytical approaches to characterize the complex mixture of DOM in permafrost peatland waters cannot be overlooked, representing a first step towards greater comprehension of the organic geochemical properties of these permafrost-derived systems. Text Hudson Bay Ice Kuujjuarapik permafrost Subarctic Thermokarst Nunavik MDPI Open Access Publishing Canada Hudson Hudson Bay Kuujjuarapik ENVELOPE(-77.762,-77.762,55.276,55.276) Nunavik Whapmagoostui ENVELOPE(-77.750,-77.750,55.250,55.250) Water 12 11 3059 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
permafrost thermokarst peatlands subarctic DOM carbon cycle |
spellingShingle |
permafrost thermokarst peatlands subarctic DOM carbon cycle Diogo Folhas Armando C. Duarte Martin Pilote Warwick F. Vincent Pedro Freitas Gonçalo Vieira Artur M. S. Silva Regina M. B. O. Duarte João Canário Structural Characterization of Dissolved Organic Matter in Permafrost Peatland Lakes |
topic_facet |
permafrost thermokarst peatlands subarctic DOM carbon cycle |
description |
Thermokarst lakes result from the thawing of ice-rich permafrost and are widespread across northern landscapes. These waters are strong emitters of methane, especially in permafrost peatland regions, where they are stained black by high concentrations of dissolved organic matter (DOM). In the present study, we aimed to structurally characterize the DOM from a set of peatland thermokarst lakes that are known to be intense sites of microbial decomposition and methane emission. Samples were collected at different depths from three thermokarst lakes in the Sasapimakwananisikw (SAS) River valley near the eastern Hudson Bay community of Kuujjuarapik–Whapmagoostui (Nunavik, Canada). Samples were analyzed by spectrofluorometry, Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and elemental analysis. Fluorescence analyses indicated considerable amounts of autochthonous DOM in the surface waters of one of SAS 1A, indicating a strong bioavailability of labile DOM, and consequently a greater methanogenic potential. The three lakes differed in their chemical composition and diversity, suggesting various DOM transformations phenomena. The usefulness of complementary analytical approaches to characterize the complex mixture of DOM in permafrost peatland waters cannot be overlooked, representing a first step towards greater comprehension of the organic geochemical properties of these permafrost-derived systems. |
format |
Text |
author |
Diogo Folhas Armando C. Duarte Martin Pilote Warwick F. Vincent Pedro Freitas Gonçalo Vieira Artur M. S. Silva Regina M. B. O. Duarte João Canário |
author_facet |
Diogo Folhas Armando C. Duarte Martin Pilote Warwick F. Vincent Pedro Freitas Gonçalo Vieira Artur M. S. Silva Regina M. B. O. Duarte João Canário |
author_sort |
Diogo Folhas |
title |
Structural Characterization of Dissolved Organic Matter in Permafrost Peatland Lakes |
title_short |
Structural Characterization of Dissolved Organic Matter in Permafrost Peatland Lakes |
title_full |
Structural Characterization of Dissolved Organic Matter in Permafrost Peatland Lakes |
title_fullStr |
Structural Characterization of Dissolved Organic Matter in Permafrost Peatland Lakes |
title_full_unstemmed |
Structural Characterization of Dissolved Organic Matter in Permafrost Peatland Lakes |
title_sort |
structural characterization of dissolved organic matter in permafrost peatland lakes |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2020 |
url |
https://doi.org/10.3390/w12113059 |
op_coverage |
agris |
long_lat |
ENVELOPE(-77.762,-77.762,55.276,55.276) ENVELOPE(-77.750,-77.750,55.250,55.250) |
geographic |
Canada Hudson Hudson Bay Kuujjuarapik Nunavik Whapmagoostui |
geographic_facet |
Canada Hudson Hudson Bay Kuujjuarapik Nunavik Whapmagoostui |
genre |
Hudson Bay Ice Kuujjuarapik permafrost Subarctic Thermokarst Nunavik |
genre_facet |
Hudson Bay Ice Kuujjuarapik permafrost Subarctic Thermokarst Nunavik |
op_source |
Water; Volume 12; Issue 11; Pages: 3059 |
op_relation |
Water Quality and Contamination https://dx.doi.org/10.3390/w12113059 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/w12113059 |
container_title |
Water |
container_volume |
12 |
container_issue |
11 |
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3059 |
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1774718505572106240 |