Gradual onset and recovery of the Younger Dryas abrupt climate event in the tropics

J.W. Partin (), T.M. Quinn, C.-C. Shen (), Y. Okumura, M.B. Cardenas, F.P. Siringan, J.L. Banner, K. Lin, H.-M. Hu and F.W. Taylor
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J.W. Partin: Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin
T.M. Quinn: Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin
C.-C. Shen: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
Y. Okumura: Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin
M.B. Cardenas: Jackson School of Geosciences, University of Texas at Austin
F.P. Siringan: Marine Science Institute, University of the Philippines-Diliman
J.L. Banner: Jackson School of Geosciences, University of Texas at Austin
K. Lin: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
H.-M. Hu: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
F.W. Taylor: Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract Proxy records of temperature from the Atlantic clearly show that the Younger Dryas was an abrupt climate change event during the last deglaciation, but records of hydroclimate are underutilized in defining the event. Here we combine a new hydroclimate record from Palawan, Philippines, in the tropical Pacific, with previously published records to highlight a difference between hydroclimate and temperature responses to the Younger Dryas. Although the onset and termination are synchronous across the records, tropical hydroclimate changes are more gradual (>100 years) than the abrupt (10–100 years) temperature changes in the northern Atlantic Ocean. The abrupt recovery of Greenland temperatures likely reflects changes in regional sea ice extent. Proxy data and transient climate model simulations support the hypothesis that freshwater forced a reduction in the Atlantic meridional overturning circulation, thereby causing the Younger Dryas. However, changes in ocean overturning may not produce the same effects globally as in Greenland.

Date: 2015
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DOI: 10.1038/ncomms9061

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