Putnam Aaron Ervin author Columbia University. Lamont-Doherty Earth Observatory Schaefer Joerg M. author Columbia University. Lamont-Doherty Earth Observatory Denton George H. author Barrell David J. A. author Finkel Robert author Columbia University. Lamont-Doherty Earth Observatory Schwartz Roseanne G. author Columbia University. Lamont-Doherty Earth Observatory Andersen Bjørn G. author Chinn Trevor J. H. author Doughty Alice M. author Columbia University. Lamont-Doherty Earth Observatory originator text Articles 2012 English Existing paleoclimate data suggest a complex evolution of hydroclimate within the Indo-Pacific Warm Pool (IPWP) during the Holocene epoch. Here we introduce a new leaf wax isotope record from Sulawesi, Indonesia and compare proxy water isotope data with ocean-atmosphere general circulation model (OAGCM) simulations to identify mechanisms influencing Holocene IPWP hydroclimate. Modeling simulations suggest that orbital forcing causes heterogenous changes in precipitation across the IPWP on a seasonal basis that may account for the differences in time-evolution of the proxy data at respective sites. Both the proxies and simulations suggest that precipitation variability during the September–November (SON) season is important for hydroclimate in Borneo. The preëminence of the SON season suggests that a seasonally lagged relationship between the Indian monsoon and Indian Ocean Walker circulation influences IPWP hydroclimatic variability during the Holocene. Climate change Environmental science 5 627 630 2012-08-12 http://dx.doi.org/10.1038/ngeo1548 1752-0894 http://hdl.handle.net/10022/AC:P:15330 NNC NNC 2012-11-20 15:10:34 -0500 2012-11-21 15:02:20 -0500 9332 eng