Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies
Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 127(5), (2022): e2021JC018359, https://doi.org/10.1029...
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2022
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Online Access: | https://hdl.handle.net/1912/29189 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/29189 2023-05-15T13:20:25+02:00 Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies Baskaran, Mark Krupp, Katherine Bam, Wokil Maiti, Kanchan 2022-04-06 https://hdl.handle.net/1912/29189 unknown American Geophysical Union https://doi.org/10.1029/2021JC018359 Baskaran, M., Krupp, K., Bam, W., & Maiti, K. (2022). Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies. Journal of Geophysical Research: Oceans, 127(5), e2021JC018359. https://hdl.handle.net/1912/29189 doi:10.1029/2021JC018359 Baskaran, M., Krupp, K., Bam, W., & Maiti, K. (2022). Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies. Journal of Geophysical Research: Oceans, 127(5), e2021JC018359. doi:10.1029/2021JC018359 210Po 210Pb Biogeochemical cycles in the Arctic Residence time Climate change impacts in the Arctic Ocean Article 2022 ftwhoas https://doi.org/10.1029/2021JC018359 2022-10-29T22:57:31Z Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 127(5), (2022): e2021JC018359, https://doi.org/10.1029/2021JC018359. Climate change is transforming the Arctic Ocean in unprecedented ways which can be most directly observed in the systematic decline in seasonal ice coverage. From the collection and analysis of particulate and dissolved activities of 210Po and 210Pb from four deepwater superstations, as a part of the US Arctic GEOTRACES cruise during 2015, and in conjunction with previously published data, the temporal and spatial variations in their activities, inventories and residence times are evaluated. The results show that the partitioning of particulate and dissolved phases has changed significantly in the 8 years between 2007 and 2015, while the total 210Po and 210Pb activities have remained relatively unchanged. Observed total 210Po/210Pb activity ratio was less than unity in all deepwater stations, implying disequilibria in the entire water column. From the distribution of total 210Po and 210Pb in the upper 500 m of all major Arctic Basins, the derived scavenging efficiencies decrease as per the following sequence: Makarov Basin > Gakkel Bridge > Canada Basin Nansen Basin ∼ Amundsen Basin > Alpha Ridge, which is the reverse order of the calculated residence times of 210PoT. The scavenging intensities differ between the fully ice-covered, partially ice-covered, and no ice-covered stations, as observed from the differences in the average activities of 210Po and 210Pb. The average settling velocity of particulate matter based on the 210Pb activity is similar to the published values based on 230Th, indicating removal mechanism(s) of Th and Pb is (are) similar. This work was supported by National Science Foundation grants (NSF-PLR-1434578, MB; and NSF-OPP-1435376 KM). Mark Baskaran (PI) and Kanchan ... Article in Journal/Newspaper alpha ridge amundsen basin Arctic Arctic Arctic Ocean canada basin Climate change makarov basin Nansen Basin Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Alpha Ridge ENVELOPE(-120.000,-120.000,85.500,85.500) Amundsen Basin ENVELOPE(74.000,74.000,87.000,87.000) Arctic Arctic Ocean Canada Makarov Basin ENVELOPE(170.000,170.000,87.000,87.000) Journal of Geophysical Research: Oceans 127 5 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
210Po 210Pb Biogeochemical cycles in the Arctic Residence time Climate change impacts in the Arctic Ocean |
spellingShingle |
210Po 210Pb Biogeochemical cycles in the Arctic Residence time Climate change impacts in the Arctic Ocean Baskaran, Mark Krupp, Katherine Bam, Wokil Maiti, Kanchan Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies |
topic_facet |
210Po 210Pb Biogeochemical cycles in the Arctic Residence time Climate change impacts in the Arctic Ocean |
description |
Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 127(5), (2022): e2021JC018359, https://doi.org/10.1029/2021JC018359. Climate change is transforming the Arctic Ocean in unprecedented ways which can be most directly observed in the systematic decline in seasonal ice coverage. From the collection and analysis of particulate and dissolved activities of 210Po and 210Pb from four deepwater superstations, as a part of the US Arctic GEOTRACES cruise during 2015, and in conjunction with previously published data, the temporal and spatial variations in their activities, inventories and residence times are evaluated. The results show that the partitioning of particulate and dissolved phases has changed significantly in the 8 years between 2007 and 2015, while the total 210Po and 210Pb activities have remained relatively unchanged. Observed total 210Po/210Pb activity ratio was less than unity in all deepwater stations, implying disequilibria in the entire water column. From the distribution of total 210Po and 210Pb in the upper 500 m of all major Arctic Basins, the derived scavenging efficiencies decrease as per the following sequence: Makarov Basin > Gakkel Bridge > Canada Basin Nansen Basin ∼ Amundsen Basin > Alpha Ridge, which is the reverse order of the calculated residence times of 210PoT. The scavenging intensities differ between the fully ice-covered, partially ice-covered, and no ice-covered stations, as observed from the differences in the average activities of 210Po and 210Pb. The average settling velocity of particulate matter based on the 210Pb activity is similar to the published values based on 230Th, indicating removal mechanism(s) of Th and Pb is (are) similar. This work was supported by National Science Foundation grants (NSF-PLR-1434578, MB; and NSF-OPP-1435376 KM). Mark Baskaran (PI) and Kanchan ... |
format |
Article in Journal/Newspaper |
author |
Baskaran, Mark Krupp, Katherine Bam, Wokil Maiti, Kanchan |
author_facet |
Baskaran, Mark Krupp, Katherine Bam, Wokil Maiti, Kanchan |
author_sort |
Baskaran, Mark |
title |
Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies |
title_short |
Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies |
title_full |
Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies |
title_fullStr |
Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies |
title_full_unstemmed |
Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies |
title_sort |
climate change impacts to the arctic ocean revealed from high resolution geotraces po-210-pb-210-ra-226 disequilibria studies |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
https://hdl.handle.net/1912/29189 |
long_lat |
ENVELOPE(-120.000,-120.000,85.500,85.500) ENVELOPE(74.000,74.000,87.000,87.000) ENVELOPE(170.000,170.000,87.000,87.000) |
geographic |
Alpha Ridge Amundsen Basin Arctic Arctic Ocean Canada Makarov Basin |
geographic_facet |
Alpha Ridge Amundsen Basin Arctic Arctic Ocean Canada Makarov Basin |
genre |
alpha ridge amundsen basin Arctic Arctic Arctic Ocean canada basin Climate change makarov basin Nansen Basin |
genre_facet |
alpha ridge amundsen basin Arctic Arctic Arctic Ocean canada basin Climate change makarov basin Nansen Basin |
op_source |
Baskaran, M., Krupp, K., Bam, W., & Maiti, K. (2022). Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies. Journal of Geophysical Research: Oceans, 127(5), e2021JC018359. doi:10.1029/2021JC018359 |
op_relation |
https://doi.org/10.1029/2021JC018359 Baskaran, M., Krupp, K., Bam, W., & Maiti, K. (2022). Climate change impacts to the Arctic Ocean revealed from high resolution GEOTRACES Po-210-Pb-210-Ra-226 disequilibria studies. Journal of Geophysical Research: Oceans, 127(5), e2021JC018359. https://hdl.handle.net/1912/29189 doi:10.1029/2021JC018359 |
op_doi |
https://doi.org/10.1029/2021JC018359 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
5 |
_version_ |
1766353268275937280 |