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Mid- to late-Holocene El Nino-Southern Oscillation dynamics reflected in the subtropical terrestrial realm.

ABSTRACT: High resolution pollen analysis of mid- to late-Holocene peat deposits from southwest Florida reveals a stepwise increase in wetland vegetation that points to an increased precipitation-driven fresh water flow during the past 5,000 years. The tight coupling between winter precipitation patterns in Florida and the strength of the El Niño-Southern Oscillation (ENSO) strongly suggests that the paleo-hydrology record reflects changes in ENSO intensity. A terrestrial subtropical record outside the Indo Pacific Warm Pool both documents ecosystem response to the known onset of modern-day ENSO periodicities, between approximately 7,000 and 5,000 years B.P., and subsequent ENSO intensification after 3,500 years B.P. The observed increases in "wetness" are sustained by a gradual rise in relative sea level that prevents a return to drier vegetation through natural succession.

SUBMITTER: Donders TH

PROVIDER: S-EPMC1182467 | biostudies-literature | 2005 Aug

REPOSITORIES: biostudies-literature

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Mid- to late-Holocene El Nino-Southern Oscillation dynamics reflected in the subtropical terrestrial realm.

Donders Timme H TH Wagner Friederike F Dilcher David L DL Visscher Henk H

Proceedings of the National Academy of Sciences of the United States of America 20050725 31

High resolution pollen analysis of mid- to late-Holocene peat deposits from southwest Florida reveals a stepwise increase in wetland vegetation that points to an increased precipitation-driven fresh water flow during the past 5,000 years. The tight coupling between winter precipitation patterns in Florida and the strength of the El Niño-Southern Oscillation (ENSO) strongly suggests that the paleo-hydrology record reflects changes in ENSO intensity. A terrestrial subtropical record outside the In ...[more]

PMID: 16043705

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