Computer Science
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007e%26psl.253...67b&link_type=abstract
Earth and Planetary Science Letters, Volume 253, Issue 1-2, p. 67-82.
Computer Science
8
Scientific paper
The El Niño Southern Oscillation (ENSO) is a climatic phenomenon that affects socio-economical welfare in vast areas in the world. A continuous record of Holocene ENSO related climate variability of the Indo-Pacific Warm pool (IPWP) is constructed on the basis of stable oxygen isotopes in shells of planktic foraminifera from a sediment core in the western Pacific Ocean. At the centennial scale, variations in the stable oxygen isotope signal (δ18O) are thought be a representation of ENSO variability, although an imprint of local conditions cannot be entirely excluded. The record for the early Holocene (10.3 6 ka BP) shows, in comparison with the mid- to late Holocene, small amplitude variations in the δ18O record of up to 0.3‰ indicating relatively stable and warm sea surface conditions. The mid- to late Holocene (6 2 ka BP) exemplified higher variability in δ18O and thus in oceanic IPWP conditions. Climatically, we interpret this change (5.5 4.2 ka BP) as a phenomenon induced by variability in frequency and/or intensity changes of El Niño. In the period 4.2 2 ka BP we identified several periods, centred on 1.9, 2.1, 2.7, 3.3, 3.7 and 4.2 ka BP, with in general heavy δ18O values. During these periods, the IPWP was relocated to a more eastward position, enhancing the susceptibility for El Niño-like conditions at the core site. Over the last 2000 yr precipitation increased in the area as a response to an increase in Asian monsoon strength, resulting in a freshening of the surface waters. This study corroborates previous findings that the present-day ENSO activity started around 5.5 ka BP.
Bickert Torsten
Brijker J. M.
Ganssen G. M.
Jung Simon J. A.
Kroon Dick
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