Abstract
The Holocene Optimum (HO) defines a relatively warm and wet period during the Holocene, the initial and termination ages of which have been extensively reported for East Asia; however, debates still focus on underlying spatial and temporal patterns. Here, latest paleoclimate records from the East Asian monsoon region and arid central Asia are synthesized to evaluate the spatial and temporal patterns of the HO. The results of this synthesis indicate that the latitude and both the initial and termination ages of the HO follow a strong relationship, which is an expansion and northward retreat of the HO except for records around the Tibetan Plateau and several other highlands. Both the HO and technological development are also suggested to have shaped the historic boom of the Neolithic human demography. This study provides a window toward an improved understanding of the characteristics of time-transgressive HO and allows to make predictions for the initial and termination ages of the HO at different geographical locations of the East Asian monsoon region.
Highlights
Data sources and methodsThe impacts of global warming on the Asian monsoon region are not well understood and many controversies still remain (Ding et al, 2009; An et al, 2015; Yang et al, 2015)
This review presents a synthesis of the latest Holocene paleoclimatic records in Eastern Asia with a focus on the time-transgressive character, to explain the interaction between the EASM and the ISM during the Holocene Optimum (HO)
Time-transgressive characteristics of the HO in East Asian monsoon regions No obvious trends of the HO evolution were found in the East Asian monsoon region, and the onset and termination ages of speleothem sites are generally consistency (Fig. 2 a, b)
Summary
Data sources and methodsThe impacts of global warming on the Asian monsoon region are not well understood and many controversies still remain (Ding et al, 2009; An et al, 2015; Yang et al, 2015). Characteristics of time-transgressive Holocene Optimum in the East Asian monsoon region. An et al (2000) synthesized a large number of paleoclimatic records and reported a southeastward shift of the East Asian summer monsoon maximum or a time-transgressive Holocene Optimum (HO), which refers to a relatively warm and wet period during the Holocene.
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