Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical Pacific
Abstract The geochemistry of calcifying marine organisms is an excellent proxy for reconstructing paleoceanographic history, but studies of hypercalcified demosponges (sclerosponges) are considerably fewer than those of corals, foraminifers, and bivalves. For this study, we first generated near-annu...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-06-01
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| Series: | Progress in Earth and Planetary Science |
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| Online Access: | https://doi.org/10.1186/s40645-021-00434-7 |
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| author | Ryuji Asami Taketo Matsumori Ryuichi Shinjo Ryu Uemura Yuki Miyaoka Masaru Mizuyama Yuji Ise Takashi Sakamaki |
| author_facet | Ryuji Asami Taketo Matsumori Ryuichi Shinjo Ryu Uemura Yuki Miyaoka Masaru Mizuyama Yuji Ise Takashi Sakamaki |
| author_sort | Ryuji Asami |
| collection | DOAJ |
| description | Abstract The geochemistry of calcifying marine organisms is an excellent proxy for reconstructing paleoceanographic history, but studies of hypercalcified demosponges (sclerosponges) are considerably fewer than those of corals, foraminifers, and bivalves. For this study, we first generated near-annual resolved stable carbon and oxygen isotope (δ13C and δ18O) and element/Ca ratios (Sr/Ca, Ba/Ca, Pb/Ca, U/Ca) time series for 1880–2015 from sclerosponge samples (Acanthochaetetes wellsi) collected at Miyako Island and Okinawa Island in the Ryukyu Islands of southwestern Japan. The δ13C records exhibited a typical variation of anthropogenically derived Suess effects, demonstrating that the rates of decrease of –0.0043‰/year before 1960 and – 0.024‰/year after 1960 in the northwestern subtropical Pacific were respectively similar to and about 1.4 times higher than those of the Caribbean Sea in the tropical Atlantic. Spectral analysis of the δ18O time series revealed significant periodicity of approximately 2, 3, 6.5, 7–10, and 20–30 year/cycle, indicating that sea surface conditions in the southern Ryukyu Islands had been dominated by interannual and decadal variations in temperature and seawater δ18O since the late nineteenth century. The Sr/Ca and U/Ca ratios for the species A. wellsi (high-Mg calcite) might not be a robust proxy for seawater temperatures, unlike Astrosclera willeyana and Ceratoporella nicholsoni sclerosponges (aragonite). An evident increasing Pb/Ca trend after 1950 found in the samples is probably attributable to Pb emissions from industrial activities and atmospheric aerosols in eastern Asian countries. The Ba/Ca variations differ greatly among sampling sites, which might be attributable to the respective local environments. This evidence demonstrates that more high-resolution age determinations and geochemical profilings enable delineation of secular variations in ocean environments on annual and interannual timescales. Results of our study suggest that if sclerosponges living in deeper ocean environments are collected, spatial and vertical oceanographic variations for the last several centuries will be reconstructed along with coral proxy records. |
| first_indexed | 2024-12-19T21:56:13Z |
| format | Article |
| id | doaj.art-02ed95feacd6471e8b71dc04773205a3 |
| institution | Directory Open Access Journal |
| issn | 2197-4284 |
| language | English |
| last_indexed | 2024-12-19T21:56:13Z |
| publishDate | 2021-06-01 |
| publisher | SpringerOpen |
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| series | Progress in Earth and Planetary Science |
| spelling | doaj.art-02ed95feacd6471e8b71dc04773205a32022-12-21T20:04:16ZengSpringerOpenProgress in Earth and Planetary Science2197-42842021-06-018111610.1186/s40645-021-00434-7Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical PacificRyuji Asami0Taketo Matsumori1Ryuichi Shinjo2Ryu Uemura3Yuki Miyaoka4Masaru Mizuyama5Yuji Ise6Takashi Sakamaki7Institute of Geology and Paleontology, Graduate School of Science, Tohoku UniversityDepartment of Physics and Earth Sciences, Faculty of Science, University of the RyukyusDepartment of Physics and Earth Sciences, Faculty of Science, University of the RyukyusDepartment of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya UniversityTrans-disciplinary Research Organization for Subtropical Island Studies, University of the RyukyusGraduate School of Engineering and Science, University of the RyukyusTropical Biosphere Research Center, Sesoko Station, University of the RyukyusDepartment of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku UniversityAbstract The geochemistry of calcifying marine organisms is an excellent proxy for reconstructing paleoceanographic history, but studies of hypercalcified demosponges (sclerosponges) are considerably fewer than those of corals, foraminifers, and bivalves. For this study, we first generated near-annual resolved stable carbon and oxygen isotope (δ13C and δ18O) and element/Ca ratios (Sr/Ca, Ba/Ca, Pb/Ca, U/Ca) time series for 1880–2015 from sclerosponge samples (Acanthochaetetes wellsi) collected at Miyako Island and Okinawa Island in the Ryukyu Islands of southwestern Japan. The δ13C records exhibited a typical variation of anthropogenically derived Suess effects, demonstrating that the rates of decrease of –0.0043‰/year before 1960 and – 0.024‰/year after 1960 in the northwestern subtropical Pacific were respectively similar to and about 1.4 times higher than those of the Caribbean Sea in the tropical Atlantic. Spectral analysis of the δ18O time series revealed significant periodicity of approximately 2, 3, 6.5, 7–10, and 20–30 year/cycle, indicating that sea surface conditions in the southern Ryukyu Islands had been dominated by interannual and decadal variations in temperature and seawater δ18O since the late nineteenth century. The Sr/Ca and U/Ca ratios for the species A. wellsi (high-Mg calcite) might not be a robust proxy for seawater temperatures, unlike Astrosclera willeyana and Ceratoporella nicholsoni sclerosponges (aragonite). An evident increasing Pb/Ca trend after 1950 found in the samples is probably attributable to Pb emissions from industrial activities and atmospheric aerosols in eastern Asian countries. The Ba/Ca variations differ greatly among sampling sites, which might be attributable to the respective local environments. This evidence demonstrates that more high-resolution age determinations and geochemical profilings enable delineation of secular variations in ocean environments on annual and interannual timescales. Results of our study suggest that if sclerosponges living in deeper ocean environments are collected, spatial and vertical oceanographic variations for the last several centuries will be reconstructed along with coral proxy records.https://doi.org/10.1186/s40645-021-00434-7SclerospongeAcanthochaetetes wellsiOxygen and carbon isotopic compositionMinor and trace elementsIsotope equilibriumPaleoenvironmental proxy |
| spellingShingle | Ryuji Asami Taketo Matsumori Ryuichi Shinjo Ryu Uemura Yuki Miyaoka Masaru Mizuyama Yuji Ise Takashi Sakamaki Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical Pacific Progress in Earth and Planetary Science Sclerosponge Acanthochaetetes wellsi Oxygen and carbon isotopic composition Minor and trace elements Isotope equilibrium Paleoenvironmental proxy |
| title | Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical Pacific |
| title_full | Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical Pacific |
| title_fullStr | Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical Pacific |
| title_full_unstemmed | Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical Pacific |
| title_short | Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical Pacific |
| title_sort | reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical pacific |
| topic | Sclerosponge Acanthochaetetes wellsi Oxygen and carbon isotopic composition Minor and trace elements Isotope equilibrium Paleoenvironmental proxy |
| url | https://doi.org/10.1186/s40645-021-00434-7 |
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