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...
Published in: | Water |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
MDPI AG
2020
|
Subjects: | |
Online Access: | https://doi.org/10.3390/w12113059 https://doaj.org/article/794d1900fc5a48469e7d9b98327ca1e8 |
id |
ftdoajarticles:oai:doaj.org/article:794d1900fc5a48469e7d9b98327ca1e8 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:794d1900fc5a48469e7d9b98327ca1e8 2023-05-15T16:35:29+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 2020-10-01T00:00:00Z https://doi.org/10.3390/w12113059 https://doaj.org/article/794d1900fc5a48469e7d9b98327ca1e8 EN eng MDPI AG https://www.mdpi.com/2073-4441/12/11/3059 https://doaj.org/toc/2073-4441 doi:10.3390/w12113059 2073-4441 https://doaj.org/article/794d1900fc5a48469e7d9b98327ca1e8 Water, Vol 12, Iss 3059, p 3059 (2020) permafrost thermokarst peatlands subarctic DOM carbon cycle Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 article 2020 ftdoajarticles https://doi.org/10.3390/w12113059 2022-12-31T03:06:24Z 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. Article in Journal/Newspaper Hudson Bay Ice Kuujjuarapik permafrost Subarctic Thermokarst Nunavik Directory of Open Access Journals: DOAJ Articles 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 |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
permafrost thermokarst peatlands subarctic DOM carbon cycle Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 |
spellingShingle |
permafrost thermokarst peatlands subarctic DOM carbon cycle Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 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 Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 |
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 |
Article in Journal/Newspaper |
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 |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/w12113059 https://doaj.org/article/794d1900fc5a48469e7d9b98327ca1e8 |
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_source |
Water, Vol 12, Iss 3059, p 3059 (2020) |
op_relation |
https://www.mdpi.com/2073-4441/12/11/3059 https://doaj.org/toc/2073-4441 doi:10.3390/w12113059 2073-4441 https://doaj.org/article/794d1900fc5a48469e7d9b98327ca1e8 |
op_doi |
https://doi.org/10.3390/w12113059 |
container_title |
Water |
container_volume |
12 |
container_issue |
11 |
container_start_page |
3059 |
_version_ |
1766025699759489024 |