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Oligocene climate signals and forcings in Eurasia revealed by plant macrofossil and modelling results 

 
论文编号:
作者: Li SF
刊物名称: Gondwana Research
所属学科:
论文题目英文: Oligocene climate signals and forcings in Eurasia revealed by plant macrofossil and modelling results
年: 2018 JUN
卷: 61
期: 2018
页: 115–127
联系作者: Xing YW
收录类别:
影响因子: 6.959
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摘要: The Oligocene represents a transitional time period from a warm climate to a cooler climate that is more representative of the modern day; yet, a general view of continental climate pattern and forcings are still lacking. Different proxies and models show striking disparities, especially in mid-high latitudes, requiring validation of Oligocene climate reconstruction in order to understand the large-scale processes that drive the observed climate changes.Here,we compiled 149macrofossil floras in themid-high latitudes of Eurasia, then quantitatively reconstructed the Oligocene climate using Coexistence Approach (CA) and combined previously published paleoclimate data. During the Oligocene, Eurasian mid-high latitudes were mainly dominated by a humid subtropical climate. Mean annual temperature (MAT) ranged between 5.4 °C and 25.5 °C with mean annual precipitation (MAP) ranging from 338 to 2453 mm. Three regions (Europe, central Eurasia and eastern Asia) indicate different climatic regimes, with a generally warmer and wetter climate in Europe and a colder and drier climate in central Eurasiawhen compared to eastern Asia. No significant reorganization of climatewas observed between  the Early and Late Oligocene. The climate anomalies between the Oligocene and present indicate that geographic changes (e.g. retreat of the Paratethys Sea) played an important role in shaping the climate pattern of Eurasia. By comparing the fossil data to a range of different HadCM3L model simulations of the Oligocene with differing boundary conditions (e.g. CO2 and topography), we demonstrate similar large-scale climate spatial patterns between models and fossil data, however, models simulated much higher temperature seasonality (lower simulated winter temperatures and higher simulated summer temperatures) in Eurasia. Mean annual temperature analysis indicates that simulations with 560 and 1120 ppmv CO2 matched betterwith fossil datawhen compared to other simulations, depending on the topography. These results provide some constraints that should be considered for future paleoclimate modelling.
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