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Deglacial Warming and Hydroclimate Variability in the Central Indonesian Archipelago
Author(s) -
Schröder Jan F.,
Kuhnt Wolfgang,
Holbourn Ann,
Beil Sebastian,
Zhang Peng,
Hendrizan Marfasran,
Xu Jian
Publication year - 2018
Publication title -
paleoceanography and paleoclimatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.927
H-Index - 127
eISSN - 2572-4525
pISSN - 2572-4517
DOI - 10.1029/2018pa003323
Subject(s) - stadial , younger dryas , oceanography , geology , holocene , climatology , glacial period , sea surface temperature , precipitation , sea level , archipelago , westerlies , physical geography , geography , paleontology , meteorology
We present centennial‐scale records of sea surface temperature and oxygen isotopes from the Celebes Sea, Makassar Strait, Flores Sea, and northwestern Banda Sea, which provide new insights into the variability of Indonesian hydroclimate over the past 25 kyr. Deglacial warming was generally gradual with an amplitude of 3–4 °C. Statistical evaluation of the temperature data suggests that the onset of deglacial sea surface temperatures warming in the tropical Indonesian Sea occurred earlier than the global atmospheric CO 2 rise. In contrast to previous terrestrial precipitation records, our ice volume‐corrected δ 18 O of seawater (δ 18 O sw ) does not support widespread aridity in central Indonesia during the last glacial period. While δ 18 O sw was substantially enriched during Heinrich Stadial 1 and the Younger Dryas, δ 18 O sw values were only ~0.2‰ heavier during the Last Glacial Maximum than during the Holocene. Heavier δ 18 O sw during Heinrich Stadial 1 and the Younger Dryas either reflects a decline in precipitation amount and/or increased δ 18 O of rainfall in central Indonesia, both likely caused by a southward displacement of the tropical rain belt. Comparison of the Celebes Sea, Makassar Strait, Flores Sea, and Banda Sea records suggests that rainfall isotope and/or amount changes were comparable over Borneo and Sulawesi during the last termination.