Enhanced Arabian Sea intermediate water flow during glacial North Atlantic cold phases

• Published in: Earth and Planetary Science Letters
• Main Authors: Jung, S.J.A., Kroon, D., Ganssen, G.M., Peeters, F.J.C., Ganeshram, R.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2009
• Subjects: /dk/atira/pure/sustainabledevelopmentgoals/life_below_water; name=SDG 14 - Life Below Water; Antarctic; Greenland; Indian; Antarc*; North Atlantic
• Online Access: https://research.vu.nl/en/publications/ea0b7a44-abf1-42a0-a829-42b6c6c8e239; https://doi.org/10.1016/j.epsl.2009.01.037; https://hdl.handle.net/1871.1/ea0b7a44-abf1-42a0-a829-42b6c6c8e239

During the last glacial period, polar ice cores indicate climate asynchrony between the poles at the millennial time-scale. Yet, surface ocean circulation in large parts of the globe varied in tune with Greenland temperature fluctuations suggesting that any anti-phase behavior to a substantial degree must lie in the deeper global ocean circulation which is poorly understood outside the Atlantic Ocean. Here we present data from the north-western Indian Ocean which indicate that the timing of maxima in northward extensions of glacial Antarctic Intermediate Water (GAAIW) coincides with dramatically reduced thermohaline overturn in the North Atlantic associated with the Heinrich-ice surge events (HE). The repeated expansion of the GAAIW during HEs, recorded far north of the equator in the Arabian Sea, suggests that southern hemisphere driven intermediate water mass variability forms an integral part of the inter-hemisphere asynchronous climate change behavior at the millennial time-scale. Crown Copyright © 2009.