Climatic forcing before, during, and after the 8.2 Kyr B.P. global cooling event

Journal of Earth system science

Stephan G Walker1²  William G Large2¹  Devendra Lal1² 

[1] National Center for Atmospheric Research, Boulder, Colorado, CO 80307, USA.$$;Scripps Institution of Oceanography, GRD 0244, La Jolla, CA 92093, USA.$$

关键词: 8.2Kyr cooling event;    paleoclimate;    atmospheric 14C;    atmospheric 𝛿18O;    enhanced oceanic mixing;    cosmogenic 14C in ice;    atmospheric sciences;    climate;    modeling.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

This paper attempts at full characterization of the unique global 8.2Kyr B.P. cooling event. Significant atmospheric cooling started during 9.5–8.5Kyr B.P. when the Sun was extremely quiet during three periods of ∼50–100 years. The flood of melt water in the N. Atlantic from glacial lakes during the demise of the Laurentide ice sheet, starting at ∼8.5Kyr B.P., adds to the atmospheric cooling. Climatic forcing events occurred at 8.5Kyr B.P., at 8.2Kyr B.P. and finally at 8.06Kyr B.P., leading to concurrent increases or decreases in the atmospheric 𝛥14C levels, completely consistent with the climatic forcing proposed here.

【 授权许可】

Unknown