Revisiting of paleoclimate recording δ18O as scalar turbulence

黄永祥 博士
厦门大学

2018年4月26日（星期四）09:00
科研楼303会议室

报告会主持人：段安民 研究员

Abstract

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.