Marine ENSO record implies major changes contemporaneous with Heinrich Event 1
Abstract
Laminated marine cores were recovered from the ENSO region on the Peruvian shelf during cruise Sonne 147 in 2000. Core 106 KL from 184 m waterdepth covers the last glacial cycle. Its upper 11 m comprise sedimentation since the Last Glacial Maximum and have been dated by 42 AMS-14C radiocarbon ages. The major change of the sea surface temperature, marine bioproductivity and continental precipitation already happened between 18--17,000 cal yr BP. At that time proxies for these parameters reach a Holocene-like level contemporaneous with the beginning decay of the Laurentian ice sheet during Heinrich Event 1. It is also contemporaneous with a tropical October-December insolation maximum, the last before our modern insolation maximum. If Heinrich Event 1 was cause or effect of major change in the East Pacific ENSO region remains to be discovered. The timing of the two events, however, points to a link between the stability of the large Late Glacial Laurentian ice sheet and ENSO related SST patterns of the low latitude Pacific.
- Publication:
-
EGS - AGU - EUG Joint Assembly
- Pub Date:
- April 2003
- Bibcode:
- 2003EAEJA.....5262R