Southward migration of the intertropical convergence zone through the holocene

G. H. Haug, K. A. Hughen, D. M. Sigman, L. C. Peterson, U. Röhl

Research output: Contribution to journalArticlepeer-review

1834 Scopus citations

Abstract

Titanium and iron concentration data from the anoxic Cariaco Basin, off the Venezuelan coast, can be used to infer variations in the hydrological cycle over northern South America during the past 14,000 years with subdecadal resolution. Following a dry Younger Dryas, a period of increased precipitation and riverine discharge occurred during the Holocene "thermal maximum." Since ∼5400 years ago, a trend toward drier conditions is evident from the data, with high-amplitude fluctuations and precipitation minima during the time interval 3800 to 2800 years ago and during the "Little Ice Age." These regional changes in precipitation are best explained by shifts in the mean latitude of the Atlantic Intertropical Convergence Zone (ITCZ), potentially driven by Pacific-based climate variability. The Cariaco Basin record exhibits strong correlations with climate records from distant regions, including the high-latitude Northern Hemisphere, providing evidence for global teleconnections among regional climates.

Original languageEnglish (US)
Pages (from-to)1304-1308
Number of pages5
JournalScience
Volume293
Issue number5533
DOIs
StatePublished - Aug 17 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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