全新世澳大利亚季风的瞬时耦合关系
Transient coupling relationships of the Holocene Australian monsoon
摘要：
澳大利亚西北部夏季风的年际变化与其他区域季风系统的相互作用有很大关系。因此，这些关系的性质的变化可能会导致季风强度在更长的时间尺度上的变化。以前曾试图评估澳大利亚-澳大利亚季风区的代用记录如何与印度和东亚季风区的其他记录以及与厄尔尼诺有关的代用记录相对应，但都是定性的，依赖“曲线拟合”方法。在这里，我们寻求一个定量的方法来确定古气候代理记录之间的耦合关系，采用统计技术来计算两个古气候时间序列的相互依赖性。我们验证了复杂网络的使用，以确定现代气候指数之间的耦合关系。这种方法，然后扩展到一套古气候代用记录，从亚洲，澳大拉西亚和南美洲地区跨越过去9,000年。由此产生的网络展示了千年时间尺度上的区域季风系统之间的耦合关系的存在，但也突出了在此期间的遥相关的瞬态性质。在澳大利亚西北部的夏季风的背景下，我们认识到一个转变的耦合关系，从强大的半球间的联系与东亚和ITCZ相关的代理记录在全新世中期显着较弱的耦合在晚全新世。虽然所确定的联系不能解释导致区域季风系统之间耦合的基本物理过程，但这种方法为理解遥相关变化在千年至轨道尺度气候变率中的作用迈出了一步。
英文摘要：
The northwest Australian summer monsoon owes a notable degree of its interannual variability to interactions with other regional monsoon systems. Therefore, changes in the nature of these relationships may contribute to variability in monsoon strength over longer time scales. Previous attempts to evaluate how proxy records from the Indonesian-Australian monsoon region correspond to other records from the Indian and East Asian monsoon regions, as well as to El Niño-related proxy records, have been qualitiative, relying on `curve-fitting' methods. Here, we seek a quantitative approach for identifying coupling relationships between paleoclimate proxy records, employing statistical techniques to compute the interdependence of two paleoclimate time series. We verify the use of complex networks to identify coupling relationships between modern climate indices. This method is then extended to a set of paleoclimate proxy records from the Asian, Australasian and South American regions spanning the past 9,000 years. The resulting networks demonstrate the existence of coupling relationships between regional monsoon systems on millennial time scales, but also highlight the transient nature of teleconnections during this period. In the context of the northwest Australian summer monsoon, we recognise a shift in coupling relationships from strong interhemispheric links with East Asian and ITCZ-related proxy records in the mid-Holocene to significantly weaker coupling in the later Holocene. Although the identified links cannot explain the underlying physical processes leading to coupling between regional monsoon systems, this method provides a step towards understanding the role that changes in teleconnections play in millennial- to orbital-scale climate variability.
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