Abrupt upwelling and CO(2) outgassing episodes in the north-eastern Arabian Sea since mid-Holocene
Identifying the causes and consequences of natural variations in ocean acidification and atmospheric CO(2) due to complex earth processes has been a major challenge for climate scientists in the past few decades. Recent developments in the boron isotope (δ(11)B) based seawater pH and pCO(2) (or pCO(...
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ftpubmed:oai:pubmedcentral.nih.gov:8907218 2023-05-15T17:50:33+02:00 Abrupt upwelling and CO(2) outgassing episodes in the north-eastern Arabian Sea since mid-Holocene Azharuddin, Syed Govil, Pawan Chalk, Thomas B. Shekhar, Mayank Foster, Gavin L. Mishra, Ravi 2022-03-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8907218/ https://doi.org/10.1038/s41598-022-07774-4 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8907218/ http://dx.doi.org/10.1038/s41598-022-07774-4 © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Sci Rep Article Text 2022 ftpubmed https://doi.org/10.1038/s41598-022-07774-4 2022-03-13T02:01:15Z Identifying the causes and consequences of natural variations in ocean acidification and atmospheric CO(2) due to complex earth processes has been a major challenge for climate scientists in the past few decades. Recent developments in the boron isotope (δ(11)B) based seawater pH and pCO(2) (or pCO(2)(sw)) proxy have been pivotal in understanding the various oceanic processes involved in air-sea CO(2) exchange. Here we present the first foraminifera-based δ(11)B record from the north-eastern Arabian Sea (NEAS) covering the mid-late Holocene (~ 8–1 ka). Our record suggests that the region was overall a moderate to strong CO(2) sink during the last 7.7 kyr. The region behaved as a significant CO(2) source during two short intervals around 5.5–4 ka and 2.8–2.5 ka. The decreased pH and increased CO(2) outgassing during those abrupt episodes are associated with the increased upwelling in the area. The upwelled waters may have increased the nutrient content of the surface water through either increased supply or weaker export production. This new dataset from the coastal NEAS suggests that, as a potential result of changes in the strength of the El-Nino Southern Oscillation, the region experienced short episodes of high CO(2) outgassing and pre-industrial ocean acidification comparable to or even greater than that experienced during the last ~ 200 years. Text Ocean acidification PubMed Central (PMC) Scientific Reports 12 1 |
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Article Azharuddin, Syed Govil, Pawan Chalk, Thomas B. Shekhar, Mayank Foster, Gavin L. Mishra, Ravi Abrupt upwelling and CO(2) outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
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Identifying the causes and consequences of natural variations in ocean acidification and atmospheric CO(2) due to complex earth processes has been a major challenge for climate scientists in the past few decades. Recent developments in the boron isotope (δ(11)B) based seawater pH and pCO(2) (or pCO(2)(sw)) proxy have been pivotal in understanding the various oceanic processes involved in air-sea CO(2) exchange. Here we present the first foraminifera-based δ(11)B record from the north-eastern Arabian Sea (NEAS) covering the mid-late Holocene (~ 8–1 ka). Our record suggests that the region was overall a moderate to strong CO(2) sink during the last 7.7 kyr. The region behaved as a significant CO(2) source during two short intervals around 5.5–4 ka and 2.8–2.5 ka. The decreased pH and increased CO(2) outgassing during those abrupt episodes are associated with the increased upwelling in the area. The upwelled waters may have increased the nutrient content of the surface water through either increased supply or weaker export production. This new dataset from the coastal NEAS suggests that, as a potential result of changes in the strength of the El-Nino Southern Oscillation, the region experienced short episodes of high CO(2) outgassing and pre-industrial ocean acidification comparable to or even greater than that experienced during the last ~ 200 years. |
format |
Text |
author |
Azharuddin, Syed Govil, Pawan Chalk, Thomas B. Shekhar, Mayank Foster, Gavin L. Mishra, Ravi |
author_facet |
Azharuddin, Syed Govil, Pawan Chalk, Thomas B. Shekhar, Mayank Foster, Gavin L. Mishra, Ravi |
author_sort |
Azharuddin, Syed |
title |
Abrupt upwelling and CO(2) outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_short |
Abrupt upwelling and CO(2) outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_full |
Abrupt upwelling and CO(2) outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_fullStr |
Abrupt upwelling and CO(2) outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_full_unstemmed |
Abrupt upwelling and CO(2) outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_sort |
abrupt upwelling and co(2) outgassing episodes in the north-eastern arabian sea since mid-holocene |
publisher |
Nature Publishing Group UK |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8907218/ https://doi.org/10.1038/s41598-022-07774-4 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Sci Rep |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8907218/ http://dx.doi.org/10.1038/s41598-022-07774-4 |
op_rights |
© The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
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https://doi.org/10.1038/s41598-022-07774-4 |
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