https://scholars.lib.ntu.edu.tw/handle/123456789/633593
標題: | Multi-proxy validation of glacial-interglacial rainfall variations in southwest Sulawesi | 作者: | Kimbrough, Alena K. Gagan, Michael K. Dunbar, Gavin B. Hantoro, Wahyoe S. CHUAN-CHOU SHEN Hu, Hsun Ming Cheng, Hai Edwards, R. Lawrence Rifai, Hamdi Suwargadi, Bambang W. |
公開日期: | 1-十二月-2023 | 卷: | 4 | 期: | 1 | 來源出版物: | Communications Earth and Environment | 摘要: | Speleothem δ18O is widely used as a proxy for rainfall amount in the tropics on glacial-interglacial to interannual scales. However, uncertainties in the interpretation of this renowned proxy pose a vexing problem in tropical paleoclimatology. Here, we present paired multi-proxy geochemical measurements for stalagmites from southwest Sulawesi, Indonesia, and confirm changes in rainfall amount across ice age terminations. Collectively, the stalagmites span two glacial-interglacial transitions from ~380,000 to 330,000 and 230,000 to 170,000 years ago. Mg/Ca in the slow-growing stalagmites is affected by water moving through the karst and prior calcite precipitation, making it a good proxy for changes in local rainfall. When paired, Mg/Ca and δ18O corroborate prominent shifts from drier glacials to wetter interglacials in the core of the Australasian monsoon domain. These shifts in rainfall occur 4,000-7,000 years later than glacial-interglacial increases in global temperature and the associated response of Sulawesi vegetation, determined by speleothem δ13C. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/633593 | ISSN: | 2662-4435 | DOI: | 10.1038/s43247-023-00873-8 |
顯示於: | 地質科學系 |
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