Abrupt upwelling and CO2 outgassing episodes in the north-eastern Arabian Sea since mid-Holocene
Abstract Identifying the causes and consequences of natural variations in ocean acidification and atmospheric CO2 due to complex earth processes has been a major challenge for climate scientists in the past few decades. Recent developments in the boron isotope (δ11B) based seawater pH and pCO2 (or p...
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ftdoajarticles:oai:doaj.org/article:28483839f1734349a95190aa0db73256 2023-05-15T17:50:35+02:00 Abrupt upwelling and CO2 outgassing episodes in the north-eastern Arabian Sea since mid-Holocene Syed Azharuddin Pawan Govil Thomas B. Chalk Mayank Shekhar Gavin L. Foster Ravi Mishra 2022-03-01T00:00:00Z https://doi.org/10.1038/s41598-022-07774-4 https://doaj.org/article/28483839f1734349a95190aa0db73256 EN eng Nature Portfolio https://doi.org/10.1038/s41598-022-07774-4 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-022-07774-4 2045-2322 https://doaj.org/article/28483839f1734349a95190aa0db73256 Scientific Reports, Vol 12, Iss 1, Pp 1-12 (2022) Medicine R Science Q article 2022 ftdoajarticles https://doi.org/10.1038/s41598-022-07774-4 2022-12-31T14:30:25Z Abstract Identifying the causes and consequences of natural variations in ocean acidification and atmospheric CO2 due to complex earth processes has been a major challenge for climate scientists in the past few decades. Recent developments in the boron isotope (δ11B) based seawater pH and pCO2 (or pCO2 sw) proxy have been pivotal in understanding the various oceanic processes involved in air-sea CO2 exchange. Here we present the first foraminifera-based δ11B 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 CO2 sink during the last 7.7 kyr. The region behaved as a significant CO2 source during two short intervals around 5.5–4 ka and 2.8–2.5 ka. The decreased pH and increased CO2 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 CO2 outgassing and pre-industrial ocean acidification comparable to or even greater than that experienced during the last ~ 200 years. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Scientific Reports 12 1 |
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Medicine R Science Q Syed Azharuddin Pawan Govil Thomas B. Chalk Mayank Shekhar Gavin L. Foster Ravi Mishra Abrupt upwelling and CO2 outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
topic_facet |
Medicine R Science Q |
description |
Abstract Identifying the causes and consequences of natural variations in ocean acidification and atmospheric CO2 due to complex earth processes has been a major challenge for climate scientists in the past few decades. Recent developments in the boron isotope (δ11B) based seawater pH and pCO2 (or pCO2 sw) proxy have been pivotal in understanding the various oceanic processes involved in air-sea CO2 exchange. Here we present the first foraminifera-based δ11B 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 CO2 sink during the last 7.7 kyr. The region behaved as a significant CO2 source during two short intervals around 5.5–4 ka and 2.8–2.5 ka. The decreased pH and increased CO2 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 CO2 outgassing and pre-industrial ocean acidification comparable to or even greater than that experienced during the last ~ 200 years. |
format |
Article in Journal/Newspaper |
author |
Syed Azharuddin Pawan Govil Thomas B. Chalk Mayank Shekhar Gavin L. Foster Ravi Mishra |
author_facet |
Syed Azharuddin Pawan Govil Thomas B. Chalk Mayank Shekhar Gavin L. Foster Ravi Mishra |
author_sort |
Syed Azharuddin |
title |
Abrupt upwelling and CO2 outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_short |
Abrupt upwelling and CO2 outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_full |
Abrupt upwelling and CO2 outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_fullStr |
Abrupt upwelling and CO2 outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_full_unstemmed |
Abrupt upwelling and CO2 outgassing episodes in the north-eastern Arabian Sea since mid-Holocene |
title_sort |
abrupt upwelling and co2 outgassing episodes in the north-eastern arabian sea since mid-holocene |
publisher |
Nature Portfolio |
publishDate |
2022 |
url |
https://doi.org/10.1038/s41598-022-07774-4 https://doaj.org/article/28483839f1734349a95190aa0db73256 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Scientific Reports, Vol 12, Iss 1, Pp 1-12 (2022) |
op_relation |
https://doi.org/10.1038/s41598-022-07774-4 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-022-07774-4 2045-2322 https://doaj.org/article/28483839f1734349a95190aa0db73256 |
op_doi |
https://doi.org/10.1038/s41598-022-07774-4 |
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Scientific Reports |
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12 |
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1 |
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1766157395834175488 |