low Indian native Jung

Core/Site name:

Core NIOP 905


Arabian Sea




marine sediments (downcore)

Proxy measurement:

benthic foraminiferal d18O and d13C

Sampling resolution:



87.582 ky BP


0.95688 ky BP


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 drivenintermediate water mass variability forms an integral part of the inter-hemisphere asynchronous climate change behavior at the millennial time-scale.

Data entered by name:

Mortyn, P. Graham

Data entered by email:

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Main reference(s):

Jung, S.J.A., D. Kroon, G. Ganssen, F. Peeters, and R. Ganeshram. 2009. Enhanced Arabian Sea intermediate water flow during glacial North Atlantic cold phases. Earth and Planetary Science Letters, Vol. 280, pp. 220-228. doi:10.1016/j.epsl.2009.01.037

Link to reference 1:


Link to reference 2:


Data storage link 1:



Isotopic data are actually smoothed with 700yr-running average

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k