Ocean acidification in the Western Pacific: Boron isotopic composition recorded in a tropical massive coral core from Lanyu Islet SE Taiwan

Boron (B) and B isotopic compositions (δ 11 B) in biogenic carbonates are useful proxies for pH reconstruction in the ocean. However, high-resolution archives are scarce due to associated sampling and analytical difficulty. In this study, a modern long-lived massive coral skeleton ( Porites lobata )...

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Published in:Frontiers in Marine Science
Main Authors: You, Chen-Feng, Lin, P-Y., Huang, Kuo-Fang, Chung, Chuan-Hsiung, Liu, Zhifei
Other Authors: Ministry of Science and Technology
Format: Article in Journal/Newspaper
Language:unknown
Published: Frontiers Media SA 2022
Subjects:
Online Access:http://dx.doi.org/10.3389/fmars.2022.877810
https://www.frontiersin.org/articles/10.3389/fmars.2022.877810/full
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spelling crfrontiers:10.3389/fmars.2022.877810 2024-05-19T07:46:34+00:00 Ocean acidification in the Western Pacific: Boron isotopic composition recorded in a tropical massive coral core from Lanyu Islet SE Taiwan You, Chen-Feng Lin, P-Y. Huang, Kuo-Fang Chung, Chuan-Hsiung Liu, Zhifei Ministry of Science and Technology 2022 http://dx.doi.org/10.3389/fmars.2022.877810 https://www.frontiersin.org/articles/10.3389/fmars.2022.877810/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 9 ISSN 2296-7745 journal-article 2022 crfrontiers https://doi.org/10.3389/fmars.2022.877810 2024-05-01T06:50:15Z Boron (B) and B isotopic compositions (δ 11 B) in biogenic carbonates are useful proxies for pH reconstruction in the ocean. However, high-resolution archives are scarce due to associated sampling and analytical difficulty. In this study, a modern long-lived massive coral skeleton ( Porites lobata ) from Lanyu Islet off southeast Taiwan was drilled and used for high-resolution major/trace element analyses, including trace elements B and δ 11 B, as well as oxygen and carbon isotopes, to investigate the associated environmental changes during 1991–1997. To avoid complicated biological influence, the top-most tissue layer was excluded in this study. The coralline records show a clear temporal trend in metal/Ca-based sea surface temperatures (SSTs) on annual and monthly timescales. In particular, the Mg/Ca-SSTs, the most sensitive temperature proxy at the site, show a significant warming trend (+0.2°C year −1 ) during the study period. On the other hand, subtle changes in the annual δ 11 B record were identified, corresponding to ~0.2 pH unit, which is comparable with other coral records in the Pacific, e.g., the South China Sea (SCS), Guam Island, Flinders, and Arlington Reef, as well as the in-situ seawater pH measurement at Hawaii station. This corresponds to an acidification rate of ~0.25 pH unit 100 year −1 , similar to other coralline data, in-situ pH/pCO 2 measurement, or model predictions, and emphasizes the importance of ocean acidification due to anthropogenic activities. Combined with the Mg/Ca-SST, the intra-annual data show a clear seasonal cycle with higher pH in winter, consistent with the pCO 2 at the oceanic surface. These chemical and isotopic results in corals conclude that marine biogenic carbonates are informative for oceanic pH reconstruction and can provide new insights into the relationships between climate changes and environmental responses on the coast of Taiwan. Article in Journal/Newspaper Ocean acidification Frontiers (Publisher) Frontiers in Marine Science 9
institution Open Polar
collection Frontiers (Publisher)
op_collection_id crfrontiers
language unknown
description Boron (B) and B isotopic compositions (δ 11 B) in biogenic carbonates are useful proxies for pH reconstruction in the ocean. However, high-resolution archives are scarce due to associated sampling and analytical difficulty. In this study, a modern long-lived massive coral skeleton ( Porites lobata ) from Lanyu Islet off southeast Taiwan was drilled and used for high-resolution major/trace element analyses, including trace elements B and δ 11 B, as well as oxygen and carbon isotopes, to investigate the associated environmental changes during 1991–1997. To avoid complicated biological influence, the top-most tissue layer was excluded in this study. The coralline records show a clear temporal trend in metal/Ca-based sea surface temperatures (SSTs) on annual and monthly timescales. In particular, the Mg/Ca-SSTs, the most sensitive temperature proxy at the site, show a significant warming trend (+0.2°C year −1 ) during the study period. On the other hand, subtle changes in the annual δ 11 B record were identified, corresponding to ~0.2 pH unit, which is comparable with other coral records in the Pacific, e.g., the South China Sea (SCS), Guam Island, Flinders, and Arlington Reef, as well as the in-situ seawater pH measurement at Hawaii station. This corresponds to an acidification rate of ~0.25 pH unit 100 year −1 , similar to other coralline data, in-situ pH/pCO 2 measurement, or model predictions, and emphasizes the importance of ocean acidification due to anthropogenic activities. Combined with the Mg/Ca-SST, the intra-annual data show a clear seasonal cycle with higher pH in winter, consistent with the pCO 2 at the oceanic surface. These chemical and isotopic results in corals conclude that marine biogenic carbonates are informative for oceanic pH reconstruction and can provide new insights into the relationships between climate changes and environmental responses on the coast of Taiwan.
author2 Ministry of Science and Technology
format Article in Journal/Newspaper
author You, Chen-Feng
Lin, P-Y.
Huang, Kuo-Fang
Chung, Chuan-Hsiung
Liu, Zhifei
spellingShingle You, Chen-Feng
Lin, P-Y.
Huang, Kuo-Fang
Chung, Chuan-Hsiung
Liu, Zhifei
Ocean acidification in the Western Pacific: Boron isotopic composition recorded in a tropical massive coral core from Lanyu Islet SE Taiwan
author_facet You, Chen-Feng
Lin, P-Y.
Huang, Kuo-Fang
Chung, Chuan-Hsiung
Liu, Zhifei
author_sort You, Chen-Feng
title Ocean acidification in the Western Pacific: Boron isotopic composition recorded in a tropical massive coral core from Lanyu Islet SE Taiwan
title_short Ocean acidification in the Western Pacific: Boron isotopic composition recorded in a tropical massive coral core from Lanyu Islet SE Taiwan
title_full Ocean acidification in the Western Pacific: Boron isotopic composition recorded in a tropical massive coral core from Lanyu Islet SE Taiwan
title_fullStr Ocean acidification in the Western Pacific: Boron isotopic composition recorded in a tropical massive coral core from Lanyu Islet SE Taiwan
title_full_unstemmed Ocean acidification in the Western Pacific: Boron isotopic composition recorded in a tropical massive coral core from Lanyu Islet SE Taiwan
title_sort ocean acidification in the western pacific: boron isotopic composition recorded in a tropical massive coral core from lanyu islet se taiwan
publisher Frontiers Media SA
publishDate 2022
url http://dx.doi.org/10.3389/fmars.2022.877810
https://www.frontiersin.org/articles/10.3389/fmars.2022.877810/full
genre Ocean acidification
genre_facet Ocean acidification
op_source Frontiers in Marine Science
volume 9
ISSN 2296-7745
op_rights https://creativecommons.org/licenses/by/4.0/
op_doi https://doi.org/10.3389/fmars.2022.877810
container_title Frontiers in Marine Science
container_volume 9
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