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Rainfall variations in central Indo-Pacific over the past 2,700 y
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Number of Authors: 192019 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 116, no 35, p. 17201-17206Article in journal (Refereed) Published
Abstract [en]

Tropical rainfall variability is closely linked to meridional shifts of the Intertropical Convergence Zone ( ITCZ) and zonal movements of the Walker circulation. The characteristics and mechanisms of tropical rainfall variations on centennial to decadal scales are, however, still unclear. Here, we reconstruct a replicated stalagmite-based 2,700-y-long, continuous record of rainfall for the deeply convective northern central Indo-Pacific ( NCIP) region. Our record reveals decreasing rainfall in the NCIP over the past 2,700 y, similar to other records from the northern tropics. Notable centennial-to decadal-scale dry climate episodes occurred in both the NCIP and the southern central Indo-Pacific ( SCIP) during the 20th century [ Current Warm Period ( CWP)] and the Medieval Warm Period ( MWP), resembling enhanced El Nino-like conditions. Further, we developed a 2,000-y-long ITCZ shift index record that supports an overall southward ITCZ shift in the central Indo-Pacific and indicates southward mean ITCZ positions during the early MWP and the CWP. As a result, the drying trend since the 20th century in the northern tropics is similar to that observed during the past warm period, suggesting that a possible anthropogenic forcing of rainfall remains indistinguishable from natural variability.

Place, publisher, year, edition, pages
2019. Vol. 116, no 35, p. 17201-17206
Keywords [en]
central Indo-Pacific, rainfall, ENSO, ITCZ, stalagmite
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-173105DOI: 10.1073/pnas.1903167116ISI: 000483396800016PubMedID: 31405969OAI: oai:DiVA.org:su-173105DiVA, id: diva2:1357745
Available from: 2019-10-04 Created: 2019-10-04 Last updated: 2019-10-04Bibliographically approved

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Tan, LiangchengWohlfarth, Barbara
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Department of Geological Sciences
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