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      Meltwater Pulse 1a drowned fringing reefs around Tahiti 15 000 years ago

      research-article
      1 , , 2 , 3 , 4
      Royal Society Open Science
      The Royal Society
      meltwater, pulse, drowned, fringing, reefs, postglacial

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          Abstract

          Reconstruction of postglacial sea-level rise using reef cores recovered from Tahiti during IODP Expedition 310 showed that the first major acceleration, known as Meltwater Pulse 1a (MWP-1a), was a 12–22 m rise in 340 years starting at 14.65 ka BP. Although it was reported that the pulse did not drown Tahitian reefs, the subsequent discovery of a fringing reef at the base of several cores implies that its timing, magnitude and impact require revision. Here, we report facies and paleodepth data from this reef, revise sea level, and revisit reef response. We find its reef crest is dominated by surf-adapted corals to a depth of 2.5 m and show that it retreated upslope over an approximately 1000-year interval from 16 ka. Reef development then apparently ceased at 15 ka at −106 m and remained absent for approximately 600 years, before resuming at 14.4 ka further upslope at −93 m. This absence is consistent with reef drowning and requires that MWP-1a had a smaller magnitude of 13.8 ± 1.3 m, and may have started 300 years earlier than previously reported. It confirms MWP-1a was a global event, drowning reefs on Tahiti as well as those in other oceans.

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          Most cited references41

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          Deglacial sea-level record from Tahiti corals and the timing of global meltwater discharge

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            Ice-sheet collapse and sea-level rise at the Bølling warming 14,600 years ago.

            Past sea-level records provide invaluable information about the response of ice sheets to climate forcing. Some such records suggest that the last deglaciation was punctuated by a dramatic period of sea-level rise, of about 20 metres, in less than 500 years. Controversy about the amplitude and timing of this meltwater pulse (MWP-1A) has, however, led to uncertainty about the source of the melt water and its temporal and causal relationships with the abrupt climate changes of the deglaciation. Here we show that MWP-1A started no earlier than 14,650 years ago and ended before 14,310 years ago, making it coeval with the Bølling warming. Our results, based on corals drilled offshore from Tahiti during Integrated Ocean Drilling Project Expedition 310, reveal that the increase in sea level at Tahiti was between 12 and 22 metres, with a most probable value between 14 and 18 metres, establishing a significant meltwater contribution from the Southern Hemisphere. This implies that the rate of eustatic sea-level rise exceeded 40 millimetres per year during MWP-1A.
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              A 17,000-year glacio-eustatic sea level record: influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation

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                Author and article information

                Contributors
                Role: ConceptualizationRole: Formal analysisRole: InvestigationRole: MethodologyRole: SupervisionRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: Data curationRole: Formal analysisRole: InvestigationRole: MethodologyRole: Writing – review & editing
                Journal
                R Soc Open Sci
                R Soc Open Sci
                RSOS
                royopensci
                Royal Society Open Science
                The Royal Society
                2054-5703
                December 13, 2023
                December 2023
                December 13, 2023
                : 10
                : 12
                : 230918
                Affiliations
                [ 1 ] Reef Geoscience Group, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, , Puerto Morelos, Mexico
                [ 2 ] Department of Earth and Environmental Sciences, University of Minnesota Twin Cities, , Minneapolis, USA
                [ 3 ] Department of Geoscience, University of Wisconsin Madison, , Madison, WI, USA
                [ 4 ] Department of Geological Sciences, University of Florida, , Gainesville, USA
                Author notes

                Electronic supplementary material is available online at https://doi.org/10.6084/m9.figshare.c.6960943.

                Author information
                http://orcid.org/0000-0002-7792-5808
                Article
                rsos230918
                10.1098/rsos.230918
                10716648
                38094270
                f67ab5a7-a7ed-45b6-ad96-f6307bf9a68c
                © 2023 The Authors.

                Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

                History
                : June 29, 2023
                : November 21, 2023
                Funding
                Funded by: Consejo Nacional de Ciencia y Tecnología, http://dx.doi.org/10.13039/501100003141;
                Award ID: CB18879
                Funded by: DGAPA-PAPIIT;
                Award ID: IN214819
                Categories
                1005
                79
                144
                Earth and Environmental Science
                Research Articles

                meltwater,pulse,drowned,fringing,reefs,postglacial
                meltwater, pulse, drowned, fringing, reefs, postglacial

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