Patterns of hydrogen peroxide among lakes of the Mackenzie Delta, western Canadian Arctic
Dissolved organic carbon (DOC) in Mackenzie Delta lakes varies in composition and concentration, ranging from low concentrations and high colour in frequently flooded lakes to high concentrations in clear lakes that are infrequently flooded. DOC is a precursor to the photochemical production of hydr...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f06-106 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-106 |
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crcansciencepubl:10.1139/f06-106 2024-06-23T07:50:09+00:00 Patterns of hydrogen peroxide among lakes of the Mackenzie Delta, western Canadian Arctic Febria, Catherine M Lesack, Lance FW Gareis, Jolie AL Bothwell, Max L 2006 http://dx.doi.org/10.1139/f06-106 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-106 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 9, page 2107-2118 ISSN 0706-652X 1205-7533 journal-article 2006 crcansciencepubl https://doi.org/10.1139/f06-106 2024-06-13T04:10:52Z Dissolved organic carbon (DOC) in Mackenzie Delta lakes varies in composition and concentration, ranging from low concentrations and high colour in frequently flooded lakes to high concentrations in clear lakes that are infrequently flooded. DOC is a precursor to the photochemical production of hydrogen peroxide (H 2 O 2 ) in lake waters. Here we assessed the patterns of H 2 O 2 using three approaches: (i) H 2 O 2 levels were tracked in 40 lakes during the open water season from the Arctic summer solstice (24 h sunlight) to late summer; (ii) diurnal dynamics of in situ H 2 O 2 were tracked in a pair of lakes with contrasting DOC regimes (coloured vs. noncoloured DOC); and (iii) buildup of H 2 O 2 was tracked in experimental microcosms of lake water exposed to manipulated UV levels. H 2 O 2 levels were highest at the solstice and in intermittently flooded lakes. During 24 h daylight, lakes with contrasting DOC regimes showed cumulative build up of H 2 O 2 during multiple cloudless days. Cumulatively, H 2 O 2 was highest in the Delta lake with a higher DOC concentration and low in colour. H 2 O 2 buildup in lake water shielded from UVB exposure was not significantly lower from microcosms under full sunlight. UVA was the most important in coloured DOC photobleaching and H 2 O 2 production. Article in Journal/Newspaper Arctic Mackenzie Delta Canadian Science Publishing Arctic Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Canadian Journal of Fisheries and Aquatic Sciences 63 9 2107 2118 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Dissolved organic carbon (DOC) in Mackenzie Delta lakes varies in composition and concentration, ranging from low concentrations and high colour in frequently flooded lakes to high concentrations in clear lakes that are infrequently flooded. DOC is a precursor to the photochemical production of hydrogen peroxide (H 2 O 2 ) in lake waters. Here we assessed the patterns of H 2 O 2 using three approaches: (i) H 2 O 2 levels were tracked in 40 lakes during the open water season from the Arctic summer solstice (24 h sunlight) to late summer; (ii) diurnal dynamics of in situ H 2 O 2 were tracked in a pair of lakes with contrasting DOC regimes (coloured vs. noncoloured DOC); and (iii) buildup of H 2 O 2 was tracked in experimental microcosms of lake water exposed to manipulated UV levels. H 2 O 2 levels were highest at the solstice and in intermittently flooded lakes. During 24 h daylight, lakes with contrasting DOC regimes showed cumulative build up of H 2 O 2 during multiple cloudless days. Cumulatively, H 2 O 2 was highest in the Delta lake with a higher DOC concentration and low in colour. H 2 O 2 buildup in lake water shielded from UVB exposure was not significantly lower from microcosms under full sunlight. UVA was the most important in coloured DOC photobleaching and H 2 O 2 production. |
format |
Article in Journal/Newspaper |
author |
Febria, Catherine M Lesack, Lance FW Gareis, Jolie AL Bothwell, Max L |
spellingShingle |
Febria, Catherine M Lesack, Lance FW Gareis, Jolie AL Bothwell, Max L Patterns of hydrogen peroxide among lakes of the Mackenzie Delta, western Canadian Arctic |
author_facet |
Febria, Catherine M Lesack, Lance FW Gareis, Jolie AL Bothwell, Max L |
author_sort |
Febria, Catherine M |
title |
Patterns of hydrogen peroxide among lakes of the Mackenzie Delta, western Canadian Arctic |
title_short |
Patterns of hydrogen peroxide among lakes of the Mackenzie Delta, western Canadian Arctic |
title_full |
Patterns of hydrogen peroxide among lakes of the Mackenzie Delta, western Canadian Arctic |
title_fullStr |
Patterns of hydrogen peroxide among lakes of the Mackenzie Delta, western Canadian Arctic |
title_full_unstemmed |
Patterns of hydrogen peroxide among lakes of the Mackenzie Delta, western Canadian Arctic |
title_sort |
patterns of hydrogen peroxide among lakes of the mackenzie delta, western canadian arctic |
publisher |
Canadian Science Publishing |
publishDate |
2006 |
url |
http://dx.doi.org/10.1139/f06-106 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-106 |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) |
geographic |
Arctic Mackenzie Delta |
geographic_facet |
Arctic Mackenzie Delta |
genre |
Arctic Mackenzie Delta |
genre_facet |
Arctic Mackenzie Delta |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 9, page 2107-2118 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f06-106 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
63 |
container_issue |
9 |
container_start_page |
2107 |
op_container_end_page |
2118 |
_version_ |
1802641016708136960 |