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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Online Access: | http://hdl.handle.net/10451/44840 https://doi.org/10.3390/w12113059 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/44840 2023-05-15T16:35:28+02:00 Structural characterization of dissolved organic matter in Permafrost Peatland Lakes Folhas, Diogo Duarte, Armando C. Pilote, Martin Vincent, Warwick F. Freitas, Pedro Vieira, Gonçalo Silva, Artur M. S. Duarte, Regina M. B. O. Canário, João 2020-11-11T15:37:54Z http://hdl.handle.net/10451/44840 https://doi.org/10.3390/w12113059 eng eng MDPI https://www.mdpi.com/2073-4441/12/11/3059 Folhas, D., Duarte, A.C., Pilote, M., Vincent, W.F., Freitas, P., Vieira, G., Silva, A.M.S., Duarte, R.M.B.O., Canário, J. (2020). Structural characterization of dissolved organic matter in Permafrost Peatland Lakes. Water, 12(11), 3059. https://doi.org/10.3390/w12113059 http://hdl.handle.net/10451/44840 doi:10.3390/w12113059 2073-4441 openAccess http://creativecommons.org/licenses/by/4.0/ CC-BY Permafrost Thermokarst Peatlands Subarctic DOM Carbon cycle article 2020 ftunivlisboa https://doi.org/10.3390/w12113059 2023-03-01T01:08:16Z 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 info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Hudson Bay Ice Kuujjuarapik permafrost Subarctic Thermokarst Nunavik Universidade de Lisboa: repositório.UL Hudson Bay Nunavik Canada Hudson Kuujjuarapik ENVELOPE(-77.762,-77.762,55.276,55.276) Whapmagoostui ENVELOPE(-77.750,-77.750,55.250,55.250) Water 12 11 3059 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Permafrost Thermokarst Peatlands Subarctic DOM Carbon cycle |
spellingShingle |
Permafrost Thermokarst Peatlands Subarctic DOM Carbon cycle Folhas, Diogo Duarte, Armando C. Pilote, Martin Vincent, Warwick F. Freitas, Pedro Vieira, Gonçalo Silva, Artur M. S. Duarte, Regina M. B. O. Canário, João 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 info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Folhas, Diogo Duarte, Armando C. Pilote, Martin Vincent, Warwick F. Freitas, Pedro Vieira, Gonçalo Silva, Artur M. S. Duarte, Regina M. B. O. Canário, João |
author_facet |
Folhas, Diogo Duarte, Armando C. Pilote, Martin Vincent, Warwick F. Freitas, Pedro Vieira, Gonçalo Silva, Artur M. S. Duarte, Regina M. B. O. Canário, João |
author_sort |
Folhas, Diogo |
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 |
MDPI |
publishDate |
2020 |
url |
http://hdl.handle.net/10451/44840 https://doi.org/10.3390/w12113059 |
long_lat |
ENVELOPE(-77.762,-77.762,55.276,55.276) ENVELOPE(-77.750,-77.750,55.250,55.250) |
geographic |
Hudson Bay Nunavik Canada Hudson Kuujjuarapik Whapmagoostui |
geographic_facet |
Hudson Bay Nunavik Canada Hudson Kuujjuarapik Whapmagoostui |
genre |
Hudson Bay Ice Kuujjuarapik permafrost Subarctic Thermokarst Nunavik |
genre_facet |
Hudson Bay Ice Kuujjuarapik permafrost Subarctic Thermokarst Nunavik |
op_relation |
https://www.mdpi.com/2073-4441/12/11/3059 Folhas, D., Duarte, A.C., Pilote, M., Vincent, W.F., Freitas, P., Vieira, G., Silva, A.M.S., Duarte, R.M.B.O., Canário, J. (2020). Structural characterization of dissolved organic matter in Permafrost Peatland Lakes. Water, 12(11), 3059. https://doi.org/10.3390/w12113059 http://hdl.handle.net/10451/44840 doi:10.3390/w12113059 2073-4441 |
op_rights |
openAccess http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3390/w12113059 |
container_title |
Water |
container_volume |
12 |
container_issue |
11 |
container_start_page |
3059 |
_version_ |
1766025697351958528 |