Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean
Abstract Dissolved black carbon (DBC) is one of the largest pools of molecularly identifiable carbon in the ocean. In the deep ocean, DBC appears to persist for millennia, whereas it can be rapidly degraded by sunlight in surface waters. In Antarctica, the downward transport of dense shelf water (DS...
Published in: | Limnology and Oceanography |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2018
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/lno.10932 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10932 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10932 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.10932 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10932 |
id |
crwiley:10.1002/lno.10932 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/lno.10932 2024-06-23T07:46:34+00:00 Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean Fang, Ziming Yang, Weifeng Chen, Min Stubbins, Aron Ma, Haoyang Jia, Renming Li, Qi Chen, Qianna State Oceanic Administration Program for New Century Excellent Talents in University China Scholarship Council National Natural Science Foundation of China 2018 http://dx.doi.org/10.1002/lno.10932 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10932 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10932 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.10932 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10932 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 63, issue 5, page 2179-2190 ISSN 0024-3590 1939-5590 journal-article 2018 crwiley https://doi.org/10.1002/lno.10932 2024-06-06T04:23:19Z Abstract Dissolved black carbon (DBC) is one of the largest pools of molecularly identifiable carbon in the ocean. In the deep ocean, DBC appears to persist for millennia, whereas it can be rapidly degraded by sunlight in surface waters. In Antarctica, the downward transport of dense shelf water (DSW) exports a massive volume of water to the deep Southern Ocean each year. If this sinking DSW is enriched in DBC, it may allow a route for DBC to escape degradation by sunlight in the surface ocean and become sequestered in the deep waters of the global ocean. To investigate this possibility, we quantified dissolved organic carbon (DOC), DBC, and ancillary properties in the waters of an Antarctic shelf sea (Prydz Bay) and adjacent waters. DBC concentrations in Prydz Bay DSW (1.2 ± 0.3 μ mol L −1 ) were elevated compared to those in circumpolar deep water (0.49 ± 0.07 μ mol L −1 ). The water column distribution of DBC in Prydz Bay suggested that sediments were the main source of DBC in DSW. A mixing model incorporating seawater oxygen isotopes (H 2 δ 18 O) indicated that Prydz Bay DSW transported DBC and DOC into the deep Southern Ocean. We estimate that the downward transport of DSW from Prydz Bay could contribute 4–9% (66–150 Gg yr −1 ) and 2–4% (3700–8500 Gg yr −1 ) to the DBC and DOC concentrations in Antarctic Bottom Water, respectively. Thus, the downward transport of DBC along the Antarctic shelf/slope is likely a significant source of DBC to the deep waters of the Southern and Global Ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctica Prydz Bay Southern Ocean Wiley Online Library Antarctic Prydz Bay Southern Ocean The Antarctic Limnology and Oceanography 63 5 2179 2190 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Dissolved black carbon (DBC) is one of the largest pools of molecularly identifiable carbon in the ocean. In the deep ocean, DBC appears to persist for millennia, whereas it can be rapidly degraded by sunlight in surface waters. In Antarctica, the downward transport of dense shelf water (DSW) exports a massive volume of water to the deep Southern Ocean each year. If this sinking DSW is enriched in DBC, it may allow a route for DBC to escape degradation by sunlight in the surface ocean and become sequestered in the deep waters of the global ocean. To investigate this possibility, we quantified dissolved organic carbon (DOC), DBC, and ancillary properties in the waters of an Antarctic shelf sea (Prydz Bay) and adjacent waters. DBC concentrations in Prydz Bay DSW (1.2 ± 0.3 μ mol L −1 ) were elevated compared to those in circumpolar deep water (0.49 ± 0.07 μ mol L −1 ). The water column distribution of DBC in Prydz Bay suggested that sediments were the main source of DBC in DSW. A mixing model incorporating seawater oxygen isotopes (H 2 δ 18 O) indicated that Prydz Bay DSW transported DBC and DOC into the deep Southern Ocean. We estimate that the downward transport of DSW from Prydz Bay could contribute 4–9% (66–150 Gg yr −1 ) and 2–4% (3700–8500 Gg yr −1 ) to the DBC and DOC concentrations in Antarctic Bottom Water, respectively. Thus, the downward transport of DBC along the Antarctic shelf/slope is likely a significant source of DBC to the deep waters of the Southern and Global Ocean. |
author2 |
State Oceanic Administration Program for New Century Excellent Talents in University China Scholarship Council National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Fang, Ziming Yang, Weifeng Chen, Min Stubbins, Aron Ma, Haoyang Jia, Renming Li, Qi Chen, Qianna |
spellingShingle |
Fang, Ziming Yang, Weifeng Chen, Min Stubbins, Aron Ma, Haoyang Jia, Renming Li, Qi Chen, Qianna Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean |
author_facet |
Fang, Ziming Yang, Weifeng Chen, Min Stubbins, Aron Ma, Haoyang Jia, Renming Li, Qi Chen, Qianna |
author_sort |
Fang, Ziming |
title |
Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean |
title_short |
Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean |
title_full |
Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean |
title_fullStr |
Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean |
title_full_unstemmed |
Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean |
title_sort |
transport of dissolved black carbon from the prydz bay shelf, antarctica to the deep southern ocean |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/lno.10932 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10932 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10932 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.10932 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10932 |
geographic |
Antarctic Prydz Bay Southern Ocean The Antarctic |
geographic_facet |
Antarctic Prydz Bay Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Prydz Bay Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Prydz Bay Southern Ocean |
op_source |
Limnology and Oceanography volume 63, issue 5, page 2179-2190 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.10932 |
container_title |
Limnology and Oceanography |
container_volume |
63 |
container_issue |
5 |
container_start_page |
2179 |
op_container_end_page |
2190 |
_version_ |
1802646717996204032 |