Distribution and Sources of Dissolved Black Carbonin Surface Waters of the Chukchi Sea, Bering Sea, and the North Pacific Ocean
Pyrogenic carbon, also called black carbon (BC), is an important component in the global carbon cycle. BC produced by biomass burning or fossil fuel combustion is transported to oceans by the atmosphere or rivers. However, environmental dynamics (i.e., major sources and sinks) of BC in marine enviro...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/68351 2023-05-15T15:17:56+02:00 Distribution and Sources of Dissolved Black Carbonin Surface Waters of the Chukchi Sea, Bering Sea, and the North Pacific Ocean Nakane, Motohiro Ajioka, Taku Yamashita, Youhei http://hdl.handle.net/2115/68351 https://doi.org/10.3389/feart.2017.00034 eng eng Frontiers Media http://hdl.handle.net/2115/68351 Frontiers in earth science, 5: UNSP 34 http://dx.doi.org/10.3389/feart.2017.00034 http://creativecommons.org/licenses/by/4.0/ CC-BY pyrogenic carbon dissolved black carbon surface waters Chukchi Sea Bering Sea North Pacific 450 article fthokunivhus https://doi.org/10.3389/feart.2017.00034 2022-11-18T01:04:35Z Pyrogenic carbon, also called black carbon (BC), is an important component in the global carbon cycle. BC produced by biomass burning or fossil fuel combustion is transported to oceans by the atmosphere or rivers. However, environmental dynamics (i.e., major sources and sinks) of BC in marine environments have not been well-documented. In this study, dissolved BC (DBC) collected from surface waters of the Chukchi Sea, the Bering Sea, and the subarctic and subtropical North Pacific were analyzed using the benzene polycarboxylic acid (BPCA) method. The DBC concentration and the ratio of B5CA and B6CA to all BPCAs (an index of the DBC condensation degree) ranged from 4.8 to 15.5 mu g-C L-1 and from 0.20 to 0.43, respectively, in surface waters of the Chukchi/Bering Seas and the North Pacific Ocean. The concentration and condensation degree of DBC in the Chukchi/Bering Seas were higher and more variable than those in the subarctic and subtropical North Pacific, which implies that the major factors controlling DBC distribution were different in these marine provinces. In the Chukchi/Bering Seas, the DBC concentration was negatively correlated to salinity but positively correlated to chromophoric dissolved organic matter (CDOM) quantity and total dissolved lignin phenol concentration estimated by CDOM parameters. These correlations indicated that the possible major source of DBC in the Chukchi/Bering Seas was Arctic rivers. However, in the North Pacific, where riverine inputs are negligible for most sampling sites, DBC was possibly derived from the atmosphere. Although spectral slopes of CDOM at 275-295 nm (an index of the photodegradation degree of CDOM) differed widely between the subarctic and subtropical North Pacific, the concentration and condensation degrees of DBC were similar between the subarctic and subtropical North Pacific, which suggests that photodegradation was not the only major factor controlling DBC distribution. Therefore, DBC distributions of the North Pacific Ocean were considered to be mainly ... Article in Journal/Newspaper Arctic Bering Sea black carbon Chukchi Chukchi Sea Subarctic Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Arctic Bering Sea Chukchi Sea Pacific Frontiers in Earth Science 5 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
pyrogenic carbon dissolved black carbon surface waters Chukchi Sea Bering Sea North Pacific 450 |
spellingShingle |
pyrogenic carbon dissolved black carbon surface waters Chukchi Sea Bering Sea North Pacific 450 Nakane, Motohiro Ajioka, Taku Yamashita, Youhei Distribution and Sources of Dissolved Black Carbonin Surface Waters of the Chukchi Sea, Bering Sea, and the North Pacific Ocean |
topic_facet |
pyrogenic carbon dissolved black carbon surface waters Chukchi Sea Bering Sea North Pacific 450 |
description |
Pyrogenic carbon, also called black carbon (BC), is an important component in the global carbon cycle. BC produced by biomass burning or fossil fuel combustion is transported to oceans by the atmosphere or rivers. However, environmental dynamics (i.e., major sources and sinks) of BC in marine environments have not been well-documented. In this study, dissolved BC (DBC) collected from surface waters of the Chukchi Sea, the Bering Sea, and the subarctic and subtropical North Pacific were analyzed using the benzene polycarboxylic acid (BPCA) method. The DBC concentration and the ratio of B5CA and B6CA to all BPCAs (an index of the DBC condensation degree) ranged from 4.8 to 15.5 mu g-C L-1 and from 0.20 to 0.43, respectively, in surface waters of the Chukchi/Bering Seas and the North Pacific Ocean. The concentration and condensation degree of DBC in the Chukchi/Bering Seas were higher and more variable than those in the subarctic and subtropical North Pacific, which implies that the major factors controlling DBC distribution were different in these marine provinces. In the Chukchi/Bering Seas, the DBC concentration was negatively correlated to salinity but positively correlated to chromophoric dissolved organic matter (CDOM) quantity and total dissolved lignin phenol concentration estimated by CDOM parameters. These correlations indicated that the possible major source of DBC in the Chukchi/Bering Seas was Arctic rivers. However, in the North Pacific, where riverine inputs are negligible for most sampling sites, DBC was possibly derived from the atmosphere. Although spectral slopes of CDOM at 275-295 nm (an index of the photodegradation degree of CDOM) differed widely between the subarctic and subtropical North Pacific, the concentration and condensation degrees of DBC were similar between the subarctic and subtropical North Pacific, which suggests that photodegradation was not the only major factor controlling DBC distribution. Therefore, DBC distributions of the North Pacific Ocean were considered to be mainly ... |
format |
Article in Journal/Newspaper |
author |
Nakane, Motohiro Ajioka, Taku Yamashita, Youhei |
author_facet |
Nakane, Motohiro Ajioka, Taku Yamashita, Youhei |
author_sort |
Nakane, Motohiro |
title |
Distribution and Sources of Dissolved Black Carbonin Surface Waters of the Chukchi Sea, Bering Sea, and the North Pacific Ocean |
title_short |
Distribution and Sources of Dissolved Black Carbonin Surface Waters of the Chukchi Sea, Bering Sea, and the North Pacific Ocean |
title_full |
Distribution and Sources of Dissolved Black Carbonin Surface Waters of the Chukchi Sea, Bering Sea, and the North Pacific Ocean |
title_fullStr |
Distribution and Sources of Dissolved Black Carbonin Surface Waters of the Chukchi Sea, Bering Sea, and the North Pacific Ocean |
title_full_unstemmed |
Distribution and Sources of Dissolved Black Carbonin Surface Waters of the Chukchi Sea, Bering Sea, and the North Pacific Ocean |
title_sort |
distribution and sources of dissolved black carbonin surface waters of the chukchi sea, bering sea, and the north pacific ocean |
publisher |
Frontiers Media |
url |
http://hdl.handle.net/2115/68351 https://doi.org/10.3389/feart.2017.00034 |
geographic |
Arctic Bering Sea Chukchi Sea Pacific |
geographic_facet |
Arctic Bering Sea Chukchi Sea Pacific |
genre |
Arctic Bering Sea black carbon Chukchi Chukchi Sea Subarctic |
genre_facet |
Arctic Bering Sea black carbon Chukchi Chukchi Sea Subarctic |
op_relation |
http://hdl.handle.net/2115/68351 Frontiers in earth science, 5: UNSP 34 http://dx.doi.org/10.3389/feart.2017.00034 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2017.00034 |
container_title |
Frontiers in Earth Science |
container_volume |
5 |
_version_ |
1766348184224792576 |