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Revisiting of paleoclimate recording δ18O as scalar turbulence
来源:LASG    访问次数:    报告时间:2018-4-26
【报告人】        黄永祥 博士
【报告人单位】厦门大学
【报告时间】    2018年4月26日(星期四)09:00
【报告地点】    科研楼303会议室
【报告简介】    Multifractality feature has been identified in the historical recording of δ18O (18O/16O ratios), which has been considered as a climate proxy of temperature. However, two facts are still unclear. One is the Hurst number, and the other one is the multifractal strength. In this work, we revisit a high-resolution paleoclimate historical recording of δ18O obtained from the North Greenland Ice-Core Project (NGRIP) with a time resolution 50 years. The multifractality property of this data is then concerned by extremal-point-density analysis and Hilbert-Huang transform. A Hurst number H = 1/3 and intermittency parameter μ = 0.64 are determined. It leads new insight to the paleoclimate dynamics and bring new challenge to the climate model simulation that a physical constrain reported in this paper must be taken into account.
 
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