Variation of East Asian monsoon precipitation during the past 21 k.y. and potential CO2 forcing

Variation of East Asian monsoon precipitation during the past 21 k.y. and potential CO2 forcing
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近21年来东亚季风降水变化

DOI:
10.1130/g34488.1
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发表时间:
2013-09
期刊:
影响因子:
5.8
通讯作者:
Otto-Bliesner, Bette
Otto-Bliesner, Bette
中科院分区:
地球科学1区
文献类型:
--
作者:
Zhang, Zhaohui;Guo, Zhengtang;Wang, Yi;Otto-Bliesner, Bette

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古气候研究可以为了解东亚季风变化的原因提供重要的见解,而东亚季风影响着今天16亿人的生活。本研究利用具有明确气候含义且独立定年的中国黄土古气候指标,重建了21 ka以来的季风降水。结果表明:21 ~ 8 ka季风降水持续减少,8 ka后降水增加,8 ~ 3 ka出现降水高峰;东亚夏季风降水的变化与北纬高纬度冰量/冰盖和大气CO2的变化是同步的。这些新数据表明,季风降水的变化可能是由二氧化碳引起的北纬高纬度温度变化驱动的,从而改变了主导季风降水的热带辐合带的位置。我们的TraCE-21000模型实验支持这一解释。
Paleoclimatic research can provide critical insight on causes of change in the East Asian monsoon, which influences the lives of 1.6 billion people today. In this study, we use paleoclimatic indexes from Chinese loess deposits, which have clear climatic implications and are independently dated, to reconstruct the monsoon precipitation since 21 ka. Our results show that monsoon precipitation persistently decreased from 21 ka to ca. 8 ka, and increased after ca. 8 ka, with a precipitation peak at 8–3 ka. These changes in East Asian summer monsoon precipitation are synchronous with changes in high-northern-latitude ice volume/ice cover and atmospheric CO2. These new data suggest that variation of the monsoon precipitation was probably driven by CO2-forced high-northern-latitude temperature changes, shifting the location of the intertropical convergence zone that dominates monsoon precipitation. Our TraCE-21000 modeling experiment supports this interpretation.
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