HR: 0800h
AN: PP11B-0536    [Abstracts]
TI: Indian Ocean and Asian Monsoon Influences on Indonesian Drought: Climate Signals in Tree Rings and Corals
AU: * D'Arrigo, R
EM: rdd@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, United States
AU: Wilson, R
EM: rob.wilson@ed.ac.uk
AF: University of Edinburgh, School of Geosciences West Mains Road, Edinburgh, EH9 3JW, United Kingdom
AU: Allan, R
EM: rob.allan@metoffice.gov.uk
AF: Hadley Centre, UK Met Office, Fitzroy Road, Exeter, EX1 3PB, United Kingdom
AU: Palmer, J
EM: Palmerama@paradise.net.nz
AF: Gondwana Tree-Ring Laboratory, P. O. B. 14, Little River, Canterbury, 7546, New Zealand
AU: Sakulich, J
EM: sakulich@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, United States
AU: Smerdon, J
EM: jsmerdon@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, United States
AU: Bijaksana, S
EM: satria@fi.itb.ac.id
AF: Institute Teknologi Bandung, Jalan Ganesha 10, Bandung, 40132, Indonesia
AU: Ngkoimani, L
EM: ngkoi@sains.fisika.net
AF: Universitas Haluoleo, Kampus Bumi Tridharma Anduonohu, Kendari, 93232, Indonesia
AB: We investigate a tree-ring and coral-based reconstruction of the Palmer Drought Severity Index (PDSI) for Java, Indonesia that preserves a history of ENSO and Indian Ocean dipole (IOD) related extremes over recent centuries. Extreme Javan droughts correspond well to known ENSO and IOD events during this period. Although Java droughts typically show the expected association with El Nino-like conditions and failed Indian monsoons, others (mainly linked to positive IOD conditions) co-occur with a strengthened Indian monsoon, suggesting linkages between the monsoon, Indonesian drought and Indian Ocean climate variability. An index of Indian Ocean dipole sea surface temperatures (SSTs), when combined with Nino-3.4 SSTs, provides a more accurate model of Java drought than Nino-3.4 SSTs alone. This result has implications for forecasting rainfall and crop productivity in the western part of the country most influenced by Indian Ocean climate variability.
DE: 1600 GLOBAL CHANGE
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 3344 Paleoclimatology (0473, 4900)
DE: 4916 Corals (4220)
DE: 4920 Dendrochronology
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting