On the glacial-interglacial variability of the Asian monsoon in speleothem δ18O records.
Guangxin Liu,Xianglei Li,Hong-Wei Chiang,Hai Cheng,Shufang Yuan,Sakonvan Chawchai,Shaoneng He,Yanbin Lu,Lin Thu Aung,Phyo Maung Maung,W N Tun,Kyaw Moe Oo,Xianfeng Wang +12 more
TLDR
It is found that the records close to the monsoon moisture source show large glacial-interglacial variability, which then decreases landward, the moisture transport pathway effect, which counteracts the forcing of glacial boundary conditions.Abstract:
While Asian monsoon (AM) changes have been clearly captured in Chinese speleothem oxygen isotope (δ18O) records, the lack of glacial-interglacial variability in the records remains puzzling. Here, we report speleothem δ18O records from three locations along the trajectory of the Indian summer monsoon (ISM), a major branch of the AM, and characterize AM rainfall over the past 180,000 years. We have found that the records close to the monsoon moisture source show large glacial-interglacial variability, which then decreases landward. These changes likely reflect a stronger oxygen isotope fractionation associated with progressive rainout of AM moisture during glacial periods, possibly due to a larger temperature gradient and suppressed plant transpiration. We term this effect, which counteracts the forcing of glacial boundary conditions, the moisture transport pathway effect.read more
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References
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