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Lake sediment hydroclimate proxies from the tropical South Pacific reveal large scale changes in the South Pacific convergence zone over the holocene

Lake sediment hydroclimate proxies from the tropical South Pacific reveal large scale changes in the South Pacific convergence zone over the holocene
Lake sediment hydroclimate proxies from the tropical South Pacific reveal large scale changes in the South Pacific convergence zone over the holocene
The South Pacific Convergence Zone (SPCZ) is one of the largest rain bands on our planet. Its interannual to decadal swings are largely governed by tropical Pacific sea surface temperature anomalies. The dynamics of this important climate feature and its response to external forcings have not been fully understood. Here we present the first continuous, Holocene record of SPCZ variability from Lake Lanoto’o, Samoa, and Atiu, Cook Islands, southwest Pacific. Covering the past 9,500 years, this record reveals massive shifts in the strength and / or position of the SPCZ and corresponding changes in hydroclimate across the South Pacific. The early Holocene (ca. 9,500-6,800 cal yr BP) documents drying near Samoa and a rapid transition thereafter to pluvial conditions beginning at ca. 6,800 cal yr BP and lasting until 2,800 cal yr BP. Thereafter, the hydroclimate regime switched back to a drier state. Our record documents a connection between hitherto undocumented large SPCZ swings and shifts in eastern equatorial Pacific climate conditions, associated with the El Niño-Southern Oscillation (ENSO) phenomenon.
Sear, David
ccd892ab-a93d-4073-a11c-b8bca42ecfd3
Hassall, Jonathan
17b719cf-5b7b-496a-8bf7-96c57618baca
Langdon, Peter
95b97671-f9fe-4884-aca6-9aa3cd1a6d7f
Timmermann, A.
6726cd89-fa43-4379-8b81-e94ca08d74fa
Croudace, Ian
24deb068-d096-485e-8a23-a32b7a68afaf
Maloney, A. E. `
61b7b468-9323-4859-9aea-6370e20903fd
J., sachs
8c275268-7d2e-44af-930d-e50c9bdfe301
Sear, David
ccd892ab-a93d-4073-a11c-b8bca42ecfd3
Hassall, Jonathan
17b719cf-5b7b-496a-8bf7-96c57618baca
Langdon, Peter
95b97671-f9fe-4884-aca6-9aa3cd1a6d7f
Timmermann, A.
6726cd89-fa43-4379-8b81-e94ca08d74fa
Croudace, Ian
24deb068-d096-485e-8a23-a32b7a68afaf
Maloney, A. E. `
61b7b468-9323-4859-9aea-6370e20903fd
J., sachs
8c275268-7d2e-44af-930d-e50c9bdfe301

Sear, David, Hassall, Jonathan, Langdon, Peter, Timmermann, A., Croudace, Ian, Maloney, A. E. ` and J., sachs (2018) Lake sediment hydroclimate proxies from the tropical South Pacific reveal large scale changes in the South Pacific convergence zone over the holocene. Asia Oceania Geosciences Society 15th Annual Meeting, Honolulu, United States. 03 Jun - 05 Aug 2018.

Record type: Conference or Workshop Item (Paper)

Abstract

The South Pacific Convergence Zone (SPCZ) is one of the largest rain bands on our planet. Its interannual to decadal swings are largely governed by tropical Pacific sea surface temperature anomalies. The dynamics of this important climate feature and its response to external forcings have not been fully understood. Here we present the first continuous, Holocene record of SPCZ variability from Lake Lanoto’o, Samoa, and Atiu, Cook Islands, southwest Pacific. Covering the past 9,500 years, this record reveals massive shifts in the strength and / or position of the SPCZ and corresponding changes in hydroclimate across the South Pacific. The early Holocene (ca. 9,500-6,800 cal yr BP) documents drying near Samoa and a rapid transition thereafter to pluvial conditions beginning at ca. 6,800 cal yr BP and lasting until 2,800 cal yr BP. Thereafter, the hydroclimate regime switched back to a drier state. Our record documents a connection between hitherto undocumented large SPCZ swings and shifts in eastern equatorial Pacific climate conditions, associated with the El Niño-Southern Oscillation (ENSO) phenomenon.

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More information

Published date: 1 December 2018
Venue - Dates: Asia Oceania Geosciences Society 15th Annual Meeting, Honolulu, United States, 2018-06-03 - 2018-08-05

Identifiers

Local EPrints ID: 432458
URI: http://eprints.soton.ac.uk/id/eprint/432458
PURE UUID: e067aa92-b374-43db-89b2-66944244a92e
ORCID for David Sear: ORCID iD orcid.org/0000-0003-0191-6179
ORCID for Peter Langdon: ORCID iD orcid.org/0000-0003-2724-2643

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Date deposited: 16 Jul 2019 16:30
Last modified: 12 Aug 2020 01:33

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Contributors

Author: David Sear ORCID iD
Author: Jonathan Hassall
Author: Peter Langdon ORCID iD
Author: A. Timmermann
Author: Ian Croudace
Author: A. E. ` Maloney
Author: sachs J.

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