Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories
Abstract Dissolved organic matter (DOM) in mountain glaciers is an important source of carbon for downstream aquatic systems, and its impact is expected to increase due to the increased melting rate of glaciers. We present a comprehensive study of Laohugou glacier no. 12 (LHG) at the northern edge o...
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crcambridgeupr:10.1017/aog.2018.20 2024-06-09T07:38:27+00:00 Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories Feng, Lin An, Yanqing Xu, Jianzhong Kang, Shichang 2018 http://dx.doi.org/10.1017/aog.2018.20 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305518000204 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by-nc-sa/4.0/ Annals of Glaciology volume 59, issue 77, page 31-40 ISSN 0260-3055 1727-5644 journal-article 2018 crcambridgeupr https://doi.org/10.1017/aog.2018.20 2024-05-15T13:07:32Z Abstract Dissolved organic matter (DOM) in mountain glaciers is an important source of carbon for downstream aquatic systems, and its impact is expected to increase due to the increased melting rate of glaciers. We present a comprehensive study of Laohugou glacier no. 12 (LHG) at the northern edge of the Tibetan Plateau to characterize the DOM composition and sources by analyzing surface fresh snow, granular ice samples, and snow pit samples which covered a whole year cycle of 2014/15. Excitation–emission matrix fluorescence spectroscopy analysis of the DOM with parallel factor analysis (EEM-PARAFAC) identified four components, including a microbially humic-like component (C1), two protein-like components (C2 and C3) and a terrestrial humic-like component (C4). The use of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) showed that DOM from all these samples was dominated by CHO and CHON molecular formulas, mainly corresponding to lipids and aliphatic/proteins compounds, reflecting the presence of significant amounts of microbially derived and/or deposited biogenic DOM. The molecular compositions of DOM showed more CHON compounds in granular ice than in fresh snow, likely suggesting newly formed DOM from microbes during snowmelting. Article in Journal/Newspaper Annals of Glaciology Cambridge University Press Annals of Glaciology 59 77 31 40 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Dissolved organic matter (DOM) in mountain glaciers is an important source of carbon for downstream aquatic systems, and its impact is expected to increase due to the increased melting rate of glaciers. We present a comprehensive study of Laohugou glacier no. 12 (LHG) at the northern edge of the Tibetan Plateau to characterize the DOM composition and sources by analyzing surface fresh snow, granular ice samples, and snow pit samples which covered a whole year cycle of 2014/15. Excitation–emission matrix fluorescence spectroscopy analysis of the DOM with parallel factor analysis (EEM-PARAFAC) identified four components, including a microbially humic-like component (C1), two protein-like components (C2 and C3) and a terrestrial humic-like component (C4). The use of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) showed that DOM from all these samples was dominated by CHO and CHON molecular formulas, mainly corresponding to lipids and aliphatic/proteins compounds, reflecting the presence of significant amounts of microbially derived and/or deposited biogenic DOM. The molecular compositions of DOM showed more CHON compounds in granular ice than in fresh snow, likely suggesting newly formed DOM from microbes during snowmelting. |
format |
Article in Journal/Newspaper |
author |
Feng, Lin An, Yanqing Xu, Jianzhong Kang, Shichang |
spellingShingle |
Feng, Lin An, Yanqing Xu, Jianzhong Kang, Shichang Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
author_facet |
Feng, Lin An, Yanqing Xu, Jianzhong Kang, Shichang |
author_sort |
Feng, Lin |
title |
Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
title_short |
Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
title_full |
Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
title_fullStr |
Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
title_full_unstemmed |
Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
title_sort |
characteristics and sources of dissolved organic matter in a glacier in the northern tibetan plateau: differences between different snow categories |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/aog.2018.20 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305518000204 |
genre |
Annals of Glaciology |
genre_facet |
Annals of Glaciology |
op_source |
Annals of Glaciology volume 59, issue 77, page 31-40 ISSN 0260-3055 1727-5644 |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/4.0/ |
op_doi |
https://doi.org/10.1017/aog.2018.20 |
container_title |
Annals of Glaciology |
container_volume |
59 |
container_issue |
77 |
container_start_page |
31 |
op_container_end_page |
40 |
_version_ |
1801373034636902400 |