Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau
Light-absorbing dissolved organic carbon (DOC) constitutes a major part of the organic carbon in glacierized regions, and has important influences on the carbon cycle and radiative forcing of glaciers. However, few DOC data are currently available from the glacierized regions of the Tibetan Plateau...
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ftdoajarticles:oai:doaj.org/article:762f78f335c84c64ab7f524a5c9c95ff 2023-05-15T18:32:30+02:00 Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau F. Yan S. Kang C. Li Y. Zhang X. Qin Y. Li X. Zhang Z. Hu P. Chen X. Li B. Qu M. Sillanpää 2016-11-01T00:00:00Z https://doi.org/10.5194/tc-10-2611-2016 https://doaj.org/article/762f78f335c84c64ab7f524a5c9c95ff EN eng Copernicus Publications http://www.the-cryosphere.net/10/2611/2016/tc-10-2611-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-2611-2016 https://doaj.org/article/762f78f335c84c64ab7f524a5c9c95ff The Cryosphere, Vol 10, Iss 6, Pp 2611-2621 (2016) Environmental sciences GE1-350 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/tc-10-2611-2016 2023-01-08T01:35:27Z Light-absorbing dissolved organic carbon (DOC) constitutes a major part of the organic carbon in glacierized regions, and has important influences on the carbon cycle and radiative forcing of glaciers. However, few DOC data are currently available from the glacierized regions of the Tibetan Plateau (TP). In this study, DOC characteristics of a medium-sized valley glacier (Laohugou Glacier No. 12, LHG) on the northern TP were investigated. Generally, DOC concentrations on LHG were comparable to those in other regions around the world. DOC concentrations in snow pits, surface snow and surface ice (superimposed ice) were 332 ± 132, 229 ± 104 and 426 ± 270 µg L −1 , respectively. The average discharge-weighted DOC of proglacial stream water was 238 ± 96 µg L −1 , and the annual DOC flux released from this glacier was estimated to be 6949 kg C yr −1 , of which 46.2 % of DOC was bioavailable and could be decomposed into CO 2 within 1 month of its release. The mass absorption cross section (MAC) of DOC at 365 nm was 1.4 ± 0.4 m 2 g −1 in snow and 1.3 ± 0.7 m 2 g −1 in ice, similar to the values for dust transported from adjacent deserts. Moreover, there was a significant relationship between DOC and Ca 2+ therefore, mineral dust transported from adjacent arid regions likely made important contributions to DOC of the glacierized regions, although contributions from autochthonous carbon and autochthonous/heterotrophic microbial activity cannot be ruled out. The radiative forcing of snow pit DOC was calculated to be 0.43 W m −2 , demonstrating that DOC in snow needs to be taken into consideration in accelerating melt of glaciers on the TP. Article in Journal/Newspaper The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 10 6 2611 2621 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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English |
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Environmental sciences GE1-350 Geology QE1-996.5 |
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Environmental sciences GE1-350 Geology QE1-996.5 F. Yan S. Kang C. Li Y. Zhang X. Qin Y. Li X. Zhang Z. Hu P. Chen X. Li B. Qu M. Sillanpää Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Light-absorbing dissolved organic carbon (DOC) constitutes a major part of the organic carbon in glacierized regions, and has important influences on the carbon cycle and radiative forcing of glaciers. However, few DOC data are currently available from the glacierized regions of the Tibetan Plateau (TP). In this study, DOC characteristics of a medium-sized valley glacier (Laohugou Glacier No. 12, LHG) on the northern TP were investigated. Generally, DOC concentrations on LHG were comparable to those in other regions around the world. DOC concentrations in snow pits, surface snow and surface ice (superimposed ice) were 332 ± 132, 229 ± 104 and 426 ± 270 µg L −1 , respectively. The average discharge-weighted DOC of proglacial stream water was 238 ± 96 µg L −1 , and the annual DOC flux released from this glacier was estimated to be 6949 kg C yr −1 , of which 46.2 % of DOC was bioavailable and could be decomposed into CO 2 within 1 month of its release. The mass absorption cross section (MAC) of DOC at 365 nm was 1.4 ± 0.4 m 2 g −1 in snow and 1.3 ± 0.7 m 2 g −1 in ice, similar to the values for dust transported from adjacent deserts. Moreover, there was a significant relationship between DOC and Ca 2+ therefore, mineral dust transported from adjacent arid regions likely made important contributions to DOC of the glacierized regions, although contributions from autochthonous carbon and autochthonous/heterotrophic microbial activity cannot be ruled out. The radiative forcing of snow pit DOC was calculated to be 0.43 W m −2 , demonstrating that DOC in snow needs to be taken into consideration in accelerating melt of glaciers on the TP. |
format |
Article in Journal/Newspaper |
author |
F. Yan S. Kang C. Li Y. Zhang X. Qin Y. Li X. Zhang Z. Hu P. Chen X. Li B. Qu M. Sillanpää |
author_facet |
F. Yan S. Kang C. Li Y. Zhang X. Qin Y. Li X. Zhang Z. Hu P. Chen X. Li B. Qu M. Sillanpää |
author_sort |
F. Yan |
title |
Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau |
title_short |
Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau |
title_full |
Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau |
title_fullStr |
Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau |
title_full_unstemmed |
Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau |
title_sort |
concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern tibetan plateau |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-2611-2016 https://doaj.org/article/762f78f335c84c64ab7f524a5c9c95ff |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, Vol 10, Iss 6, Pp 2611-2621 (2016) |
op_relation |
http://www.the-cryosphere.net/10/2611/2016/tc-10-2611-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-2611-2016 https://doaj.org/article/762f78f335c84c64ab7f524a5c9c95ff |
op_doi |
https://doi.org/10.5194/tc-10-2611-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
6 |
container_start_page |
2611 |
op_container_end_page |
2621 |
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1766216617155362816 |