Tropical warming in the Timor Sea led deglacial Antarctic warming and atmospheric CO2 rise by more than 500 yr
Tropical warming in the Timor Sea led deglacial Antarctic warming and atmospheric CO2 rise by more than 500 yr
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DOI：
10.1016/j.epsl.2010.12.021
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发表时间：
2011-02
影响因子：
5.3
通讯作者：
M. Sarnthein;P. Grootes;A. Holbourn;W. Kuhnt;Hartmut Kühn
中科院分区：
文献类型：
--
作者：
M. Sarnthein;P. Grootes;A. Holbourn;W. Kuhnt;Hartmut Kühn
On the basis of the radiocarbon (14C) plateau-tuning method, a new age model for Timor Sea Core MD01-2378 was established. It revealed a precise centennial-scale phasing of climate events in the ocean, cryo-, and atmosphere during the last deglacial and provides important new insights into causal linkages controlling events of global climate change. At Site MD01-2378, reservoir ages of surface waters dropped from 1600yr prior to 20calka to 250–500yr after 18.8calka. This evidence is crucial for generating a high-resolution age model for deglacial events in the Indo-Pacific Warm Pool. Sea-surface temperatures (SST) started to change near 18.8calka, that is ~500yr after the start of, presumably northern hemispheric, deglacial melt and sea level rise as shown by the benthic foraminiferal oxygen isotope ratio (δ18O). However, the SST rise occurred 500–1000yr prior to the onset of deglacial Antarctic warming and the first major rise in atmospheric carbon dioxide at about 18ka. The increase in SST may partly reflect reduced seasonal upwelling of cold subsurface waters along the eastern margin of the Indian Ocean, which is reflected by a doubling of the thermal gradient between the sea surface and the thermocline, a halving of chlorin productivity from 19 to 18.5calka, and in particular, by the strong decrease in surface water reservoir ages. Two significant increases in deglacial Timor Sea surface salinities from 19 to 18.5 and 15.5 to 14.5calka, may partly reflect the deglacial increase in the distance of local river mouths, partly an inter-hemispheric millennial-scale see-saw in tropical monsoon intensity, possibly linked to a deglacial increase in the dominance of Pacific El Niño regimes over Heinrich stadial 1.
