South Pacific hydrologic and cyclone variability during the last 3000 years
Toomey, Michael R.
Donnelly, Jeffrey P.
Tierney, Jessica E.
MetadataShow full item record
Major excursions in the position of the South Pacific Convergence Zone (SPCZ) and/or changes in its intensity are thought to drive tropical cyclone (TC) and precipitation variability across much of the central South Pacific. A lack of conventional sites typically used for multimillennial proxy reconstructions has limited efforts to extend observational rainfall/TC data sets and our ability to fully assess the risks posed to central Pacific islands by future changes in fresh water availability or the frequency of storm landfalls. Here we use the sedimentary record of Apu Bay, offshore the island of Tahaa, French Polynesia, to explore the relationship between SPCZ position/intensity and tropical cyclone overwash, resolved at decadal time scales, since 3200 years B.P. Changes in orbital precession and Pacific sea surface temperatures best explain evidence for a coordinated pattern of rainfall variability at Tahaa and across the Pacific over the late Holocene. Our companion record of tropical cyclone activity from Tahaa suggests major storm activity was higher between 2600-1500 years B.P., when decadal scale SPCZ variability may also have been stronger. A transition to lower storm frequency and a shift or expansion of the SPCZ toward French Polynesia around 1000 years B.P. may have prompted Polynesian migration into the central Pacific.
Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 31 (2016): 491–504, doi:10.1002/2015PA002870.
Suggested CitationPaleoceanography 31 (2016): 491–504
Showing items related by title, author, creator and subject.
Lin, I.-I.; Black, Peter G.; Price, James F.; Yang, C.-Y.; Chen, Shuyi S.; Lien, Chun-Chi; Harr, Patrick; Chi, N.-H.; Wu, C.-C.; D'Asaro, Eric A. (John Wiley & Sons, 2013-05-15)Timely and accurate forecasts of tropical cyclones (TCs, i.e., hurricanes and typhoons) are of great importance for risk mitigation. Although in the past two decades there has been steady improvement in track prediction, ...
Net community production of oxygen derived from in vitro and in situ 1-D modeling techniques in a cyclonic mesoscale eddy in the Sargasso Sea Mourino-Carballido, Beatriz; Anderson, Laurence A. (Copernicus Publications on behalf of the European Geosciences Union, 2009-08-26)It has been proposed that the disagreement traditionally reported between in vitro incubation and in situ estimates of oxygen net community production (NCP) could be explained, at least partially, by undersampling episodic ...
Tropical cyclone activity enhanced by Sahara greening and reduced dust emissions during the African Humid Period Pausata, Francesco Salvatore Rocco; Emanuel, Kerry A.; Chiacchio, Marc; Diro, Gulilat T.; Zhang, Qiong; Sushama, Laxmi; Stager, J. Curt; Donnelly, Jeffrey P. (2017-05)Tropical cyclones (TCs) can have devastating socioeconomic impacts. Understanding the nature and causes of their variability is of paramount importance for society. However, historical records of TCs are too short to ...