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.

[1]  J. Shaw,et al.  Reef drowning during the last deglaciation: Evidence for catastrophic sea-level rise and ice-sheet collapse , 1995 .

[2]  G. Burr,et al.  Rapid sea-level fall and deep-ocean temperature change since the last interglacial period , 2003 .

[3]  On Postglacial Sea Level , 2007 .

[4]  S. Bowring,et al.  Isotopic composition (238U/235U) of some commonly used uranium reference materials , 2010 .

[5]  G. Camoin,et al.  IODP Expedition 310 Reconstructs Sea Level, Climatic, and Environmental Changes in the South Pacific during the Last Deglaciation , 2007 .

[6]  Lloyd A. Currie,et al.  Detection and quantification limits: origins and historical overview , 1997 .

[7]  Chris W. Hughes,et al.  Identifying the causes of sea-level change , 2009 .

[8]  E. Bard,et al.  Deglacial sea-level record from Tahiti corals and the timing of global meltwater discharge , 1996, Nature.

[9]  W. Peltier,et al.  Global glacial ice volume and Last Glacial Maximum duration from an extended Barbados sea level record , 2006 .

[10]  K. Lambeck,et al.  Sea-level at the Last Glacial Maximum: evidence from northwestern Australia to constrain ice volumes for oxygen isotope stage 2 , 2001 .

[11]  J. Okuno,et al.  Effects of water load on geophysical signals due to glacial rebound and implications for mantle viscosity , 2001 .

[12]  E. Boyle,et al.  Natural fractionation of 238U/235U , 2008 .

[13]  K. Ludwig.  User's Manual for Isoplot 3.00 - A Geochronological Toolkit for Microsoft Excel , 2003 .

[14]  P. Pezard,et al.  Integration of core, logging and drilling data in modern reefal carbonates to improve core location and recovery estimates (IODP Expedition 310) , 2008, Journal of the Geological Society.

[15]  E. Bard,et al.  U-Th ages obtained by mass spectrometry in corals from Barbados: sea level during the past 130,000 years , 1990, Nature.

[16]  W. Peltier,et al.  A calibrated deglacial drainage chronology for the North American continent: evidence of an Arctic trigger for the Younger Dryas , 2006 .

[17]  J. Barriot,et al.  Evidence for a slow subsidence of the Tahiti Island from GPS, DORIS, and combined satellite altimetry and tide gauge sea level records , 2010 .

[18]  J. Mitrovica,et al.  Searching for eustasy in deglacial sea-level histories , 2007 .

[19]  Peter U. Clark,et al.  Ice sheets and sea level of the Last Glacial Maximum , 2001 .

[20]  R. Fairbanks.  A 17,000-year glacio-eustatic sea level record: influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation , 1989, Nature.

[21]  Peter U Clark,et al.  Rapid Rise of Sea Level 19,000 Years Ago and Its Global Implications , 2004, Science.

[22]  W. T. Pfeffer,et al.  Kinematic Constraints on Glacier Contributions to 21st-Century Sea-Level Rise , 2008, Science.

[23]  Jody M. Webster,et al.  Drowning of the −150 m reef off Hawaii: A casualty of global meltwater pulse 1A? , 2004 .

[24]  G. Henderson,et al.  U and Th concentrations and isotope ratios in modern carbonates and waters from the Bahamas , 2004 .

[25]  W. R. Peltier,et al.  Arctic freshwater forcing of the Younger Dryas cold reversal , 2005, Nature.

[26]  A. Weaver,et al.  Meltwater Pulse 1A from Antarctica as a Trigger of the Bølling-Allerød Warm Interval , 2003, Science.

[27]  P. Deschamps,et al.  Penultimate Deglacial Sea-Level Timing from Uranium/Thorium Dating of Tahitian Corals , 2009, Science.

[28]  C. Pelejero,et al.  Synchroneity of meltwater pulse 1a and the Bolling warming:New evidence from the South China Sea , 2003 .

[29]  H. L. Miller,et al.  Climate Change 2007: The Physical Science Basis , 2007 .

[30]  W. Schlager,et al.  Computer simulation of reef growth , 1992 .

[31]  G. Cabioch,et al.  Reef coralgal assemblages as recorders of paleobathymetry and sea level changes in the Indo-Pacific province , 1999 .

[32]  G. Denton,et al.  Reconstructing the Antarctic Ice Sheet at the Last Glacial Maximum. , 2002 .

[33]  G. Milne,et al.  Modelling Antarctic sea-level data to explore the possibility of a dominant Antarctic contribution to meltwater pulse IA , 2007 .

[34]  I. Macintyre,et al.  Acropora palmata reef framework: A reliable indicator of sea level in the western atlantic for the past 10,000 years , 1982, Coral Reefs.

[35]  J. Chevalier,et al.  Les coraux (Scléractiniaires et Hydro‐coralliaires) de 'atoll de Takapoto, îles Tuamotu: Aspects écologiques , 1986 .

[36]  C. Buck,et al.  IntCal09 and Marine09 Radiocarbon Age Calibration Curves, 0–50,000 Years cal BP , 2009, Radiocarbon.

[37]  A. Roberts,et al.  Timing of meltwater pulse 1a and climate responses to meltwater injections , 2006 .

[38]  E. Bard,et al.  U/Th and 14C ages of corals from Barbados and their use for calibrating the 14C time scale beyond 9000 years B.P. , 1990 .

[39]  W. Broecker,et al.  New evidence from the South China Sea for an abrupt termination of the last glacial period , 1988, Nature.

[40]  E. Seibold.  Sea-level research: A manual for the collection and evaluation of data , 1988 .

[41]  Dan Bosence,et al.  Computer modeling the internal architecture of carbonate platforms , 1990 .

[42]  G. Henderson,et al.  Correction of multi-collector-ICP-MS instrumental biases in high-precision uranium–thorium chronology , 2010 .

[43]  J. Duplessy,et al.  Retreat velocity of the North Atlantic polar front during the last deglaciation determined by 14C accelerator mass spectrometry , 1987, Nature.

[44]  W. Peltier,et al.  Ice Age Paleotopography , 1994, Science.

[45]  Camoin,et al.  Postglacial growth history of a French Polynesian barrier reef tract, Tahiti, central Pacific , 1999 .

[46]  H. Goosse,et al.  Could meltwater pulses have been sneaked unnoticed into the deep ocean during the last glacial? , 2007 .

[47]  J. Milliman,et al.  Reconsidering melt-water pulses 1A and 1B: Global impacts of rapid sea-level rise , 2004 .

[48]  P. Clark,et al.  Surface mass balance and geochemical constraints on the Laurentide Ice Sheet contribution to meltwater pulse 1A , 2009 .

[49]  P. Clark,et al.  Sea-Level Fingerprinting as a Direct Test for the Source of Global Meltwater Pulse IA , 2002, Science.

[50]  J. Laborel.  Vermetid gastropods as sea-level indicators , 1986 .

[51]  Paul Johnston,et al.  Timing of the Last Glacial Maximum from observed sea-level minima , 2000, Nature.

[52]  K. Lambeck,et al.  Water-load definition in the glacio-hydro-isostatic sea-level equation , 2003 .

[53]  G. Lohmann,et al.  Rapid transitions in the Atlantic thermohaline circulation triggered by global warming and meltwater during the last deglaciation , 2007 .

[54]  T. Nakamori,et al.  A geochemical model for coral reef formation , 2007, Coral Reefs.

[55]  D. Hubbard.  Depth‐Related and Species‐Related Patterns of Holocene Reef Accretion in the Caribbean and Western Atlantic: A Critical Assessment of Existing Models , 2012 .

[56]  E. Bard,et al.  New TIMS constraints on the uranium-238 and uranium-234 in seawaters from the main ocean basins and the Mediterranean Sea , 2002 .

[57]  R. Fairbanks,et al.  Extending the radiocarbon calibration beyond 26,000 years before present using fossil corals , 2005 .

[58]  D. Blakeway,et al.  Are catch‐up reefs an artefact of coring? , 2003 .

[59]  E. Bard,et al.  Deglacial Meltwater Pulse 1B and Younger Dryas Sea Levels Revisited with Boreholes at Tahiti , 2010, Science.

[60]  R. Alley,et al.  Ice-Sheet and Sea-Level Changes , 2005, Science.

[61]  G. Burr,et al.  Continuous reef growth during the last 23 cal kyr BP in a tectonically active zone (Vanuatu, SouthWest Pacific) , 2003 .

[62]  J. Webster,et al.  Variation in deglacial coralgal assemblages and their paleoenvironmental significance: IODP Expedition 310, “Tahiti Sea Level” , 2011 .

[63]  Nicolas Durand,et al.  Mineralogical determination of reef and periplatform carbonates: Calibration and implications for paleoceanography and radiochronology , 2009 .

[64]  Laura M. Wallace,et al.  Numerical modeling of the growth and drowning of Hawaiian coral reefs during the last two glacial cycles (0–250 kyr) , 2007 .

[65]  P. Aharon.  Entrainment of Meltwaters in Hyperpycnal Flows During Deglaciation Superfloods in the Gulf of Mexico: Implications for Freshwater Outflows in the Climate System , 2004 .

[66]  S. Solomon.  The Physical Science Basis : Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[67]  T. Guilderson,et al.  Radiocarbon calibration curve spanning 0 to 50,000 years BP based on paired 230 Th/ 234 U/ 238 U and 14 C dates on pristine corals , 2005 .

[68]  P. Deschamps,et al.  Further investigations on optimized tail correction and high-precision measurement of uranium isotopic ratios using multi-collector ICP-MS , 2003 .

[69]  M. Saier,et al.  Climate Change, 2007 , 2007 .

[70]  G. Knorr,et al.  Southern Ocean origin for the resumption of Atlantic thermohaline circulation during deglaciation , 2003, Nature.

[71]  I. Roy.  Evolution des volcans en systeme de point chaud : ile de tahiti, archipel de la societe (polynesie francaise) , 1994 .

[72]  Syaefudin,et al.  Pleistocene sea levels and tectonic uplift based on dating of corals from Sumba Island, Indonesia , 1996 .

[73]  J. Beck,et al.  A Large Drop in Atmospheric 14C/12C and Reduced Melting in the Younger Dryas, Documented with 230Th Ages of Corals , 1993, Science.

[74]  P. Grootes,et al.  Rapid flooding of the sunda shelf: A late-glacial sea-level record , 2000, Science.

[75]  M. Baskaran,et al.  The tracing of riverine U in Arctic seawater with very precise 234U/238U measurements , 2007 .

[76]  J. Webster,et al.  SEALEX — Internal reef chronology and virtual drill logs from a spreadsheet-based reef growth model , 2009 .

[77]  J. McManus,et al.  Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes , 2004, Nature.

[78]  J. Beck,et al.  Radiocarbon Calibration and Comparison to 50 Kyr BP with Paired 14C and 230Th Dating of Corals from Vanuatu and Papua New Guinea , 2004, Radiocarbon.

[79]  R. Alley,et al.  Origin of the first global meltwater pulse following the Last Glacial Maximum , 1996 .

[80]  G. Camoin,et al.  Proceedings of the IODP, 310 , 2007 .

[81]  W. Peltier.  On eustatic sea level history: Last Glacial Maximum to Holocene , 2002 .

[82]  P. Deschamps,et al.  Reef response to sea-level and environmental changes during the last deglaciation: Integrated Ocean Drilling Program Expedition 310, Tahiti Sea Level , 2012 .

[83]  P. Pirazzoli,et al.  Holocene sea-level changes in French Polynesia , 1988 .

[84]  T. Fichefet,et al.  Impact of transient freshwater releases in the Southern Ocean on the AMOC and climate , 2009 .

[85]  K. Lambeck,et al.  Glacial rebound and relative sea-level variations: a new appraisal , 1987 .

[86]  E. Bard,et al.  Continuous record of reef growth over the past 14 k.y. on the mid-Pacific island of Tahiti , 1997 .

[87]  W. Peltier.  On the hemispheric origins of meltwater pulse 1a , 2005 .

[88]  Marie-Louise Siggaard-Andersen,et al.  A new Greenland ice core chronology for the last glacial termination , 2006 .

[89]  K. Lambeck,et al.  Into and out of the Last Glacial Maximum: sea-level change during Oxygen Isotope Stages 3 and 2 , 2002 .

[90]  S. Manabe,et al.  Simulation of abrupt climate change induced by freshwater input to the North Atlantic Ocean , 1995, Nature.

[91]  C. Stirling,et al.  Low-temperature isotopic fractionation of uranium , 2007 .

[92]  J. Bamber,et al.  Reassessment of the Potential Sea-Level Rise from a Collapse of the West Antarctic Ice Sheet , 2009, Science.

[93]  C. Stirling,et al.  Toward epsilon levels of measurement precision on 234U/238U by using MC-ICPMS , 2004 .

[94]  Hai Cheng,et al.  The half-lives of uranium-234 and thorium-230 , 2000 .

[95]  P. Clark,et al.  Ice Sheet and Solid Earth Influences on Far-Field Sea-Level Histories , 2005, Science.

[96]  M. J. Bentley.  The Antarctic palaeo record and its role in improving predictions of future Antarctic Ice Sheet change , 2010 .