Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica
Antarctic shelf systems play an important role in organic matter circulation on Earth; hence, identifying the characteristics of dissolved organic matter (DOM) can be a good indicator for understanding its origin, as well as climate change. In this study, to identify the characteristics of DOM in th...
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ftdoajarticles:oai:doaj.org/article:f228cd56d1e74d13be7d6e4c2c5008ed 2023-05-15T14:04:12+02:00 Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica Jiyi Jang Jiyeon Park Seohee Ahn Ki-Tae Park Sun-Yong Ha Jongkwan Park Kyung Hwa Cho 2020-06-01T00:00:00Z https://doi.org/10.3389/fmars.2020.00339 https://doaj.org/article/f228cd56d1e74d13be7d6e4c2c5008ed EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2020.00339/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.00339 https://doaj.org/article/f228cd56d1e74d13be7d6e4c2c5008ed Frontiers in Marine Science, Vol 7 (2020) dissolved organic matter terrestrial DOM glacier runoff ice shelf systems King George Island Orbitrap Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2020 ftdoajarticles https://doi.org/10.3389/fmars.2020.00339 2022-12-31T01:20:34Z Antarctic shelf systems play an important role in organic matter circulation on Earth; hence, identifying the characteristics of dissolved organic matter (DOM) can be a good indicator for understanding its origin, as well as climate change. In this study, to identify the characteristics of DOM in the ice shelf systems, surface water was collected from the open sea (OS) and Marian cove (fjord, FJ). Although there were no differences in DOM characteristics between sampling sites in the quantitative analyses, the DOM in the surface water of each region seemed to be more affected by terrestrial than marine biological sources in optical and molecular properties. This finding indicates that the terrestrial DOM related to mosses based on the results of molecular properties: high levels of lipid-like (35–39%) and unsaturated hydrocarbon-like (UH; 27–34%) in both the OS and the FJ regions and significantly higher tannin-like substance and condensed aromatic structures in the FJ than in the OS region. When comparing the FJ transect samples, those nearest to a glacier (FJ1; 0.93 km from the glacier) showed relatively low salinity, high dissolved organic carbon, and high chromophoric DOM, indicating that terrestrial DOM (possibly produced by moss) inflow occurred with the runoff from the freshly melting land ice and glacier. However, no significant differences in molecular composition were detected, suggesting that terrestrial DOM is introduced into the ice shelf systems by melting land ice, and glacier runoff could be a major source of DOM-rich seawater during austral fall when low marine biological activity occurs. This study has a great significance as background data for DOM characteristics in the ice shelf systems due to the enhanced biological activity during the austral summer. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf King George Island Directory of Open Access Journals: DOAJ Articles Antarctic Austral King George Island Marian ENVELOPE(-58.750,-58.750,-62.217,-62.217) Marian Cove ENVELOPE(-58.800,-58.800,-62.217,-62.217) Frontiers in Marine Science 7 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
dissolved organic matter terrestrial DOM glacier runoff ice shelf systems King George Island Orbitrap Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
dissolved organic matter terrestrial DOM glacier runoff ice shelf systems King George Island Orbitrap Science Q General. Including nature conservation geographical distribution QH1-199.5 Jiyi Jang Jiyeon Park Seohee Ahn Ki-Tae Park Sun-Yong Ha Jongkwan Park Kyung Hwa Cho Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica |
topic_facet |
dissolved organic matter terrestrial DOM glacier runoff ice shelf systems King George Island Orbitrap Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Antarctic shelf systems play an important role in organic matter circulation on Earth; hence, identifying the characteristics of dissolved organic matter (DOM) can be a good indicator for understanding its origin, as well as climate change. In this study, to identify the characteristics of DOM in the ice shelf systems, surface water was collected from the open sea (OS) and Marian cove (fjord, FJ). Although there were no differences in DOM characteristics between sampling sites in the quantitative analyses, the DOM in the surface water of each region seemed to be more affected by terrestrial than marine biological sources in optical and molecular properties. This finding indicates that the terrestrial DOM related to mosses based on the results of molecular properties: high levels of lipid-like (35–39%) and unsaturated hydrocarbon-like (UH; 27–34%) in both the OS and the FJ regions and significantly higher tannin-like substance and condensed aromatic structures in the FJ than in the OS region. When comparing the FJ transect samples, those nearest to a glacier (FJ1; 0.93 km from the glacier) showed relatively low salinity, high dissolved organic carbon, and high chromophoric DOM, indicating that terrestrial DOM (possibly produced by moss) inflow occurred with the runoff from the freshly melting land ice and glacier. However, no significant differences in molecular composition were detected, suggesting that terrestrial DOM is introduced into the ice shelf systems by melting land ice, and glacier runoff could be a major source of DOM-rich seawater during austral fall when low marine biological activity occurs. This study has a great significance as background data for DOM characteristics in the ice shelf systems due to the enhanced biological activity during the austral summer. |
format |
Article in Journal/Newspaper |
author |
Jiyi Jang Jiyeon Park Seohee Ahn Ki-Tae Park Sun-Yong Ha Jongkwan Park Kyung Hwa Cho |
author_facet |
Jiyi Jang Jiyeon Park Seohee Ahn Ki-Tae Park Sun-Yong Ha Jongkwan Park Kyung Hwa Cho |
author_sort |
Jiyi Jang |
title |
Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica |
title_short |
Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica |
title_full |
Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica |
title_fullStr |
Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica |
title_full_unstemmed |
Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica |
title_sort |
molecular-level chemical characterization of dissolved organic matter in the ice shelf systems of king george island, antarctica |
publisher |
Frontiers Media S.A. |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2020.00339 https://doaj.org/article/f228cd56d1e74d13be7d6e4c2c5008ed |
long_lat |
ENVELOPE(-58.750,-58.750,-62.217,-62.217) ENVELOPE(-58.800,-58.800,-62.217,-62.217) |
geographic |
Antarctic Austral King George Island Marian Marian Cove |
geographic_facet |
Antarctic Austral King George Island Marian Marian Cove |
genre |
Antarc* Antarctic Antarctica Ice Shelf King George Island |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf King George Island |
op_source |
Frontiers in Marine Science, Vol 7 (2020) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2020.00339/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.00339 https://doaj.org/article/f228cd56d1e74d13be7d6e4c2c5008ed |
op_doi |
https://doi.org/10.3389/fmars.2020.00339 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
_version_ |
1766275212062490624 |