|CO2 and northern hemisphere ice volume variations over the middle and Late quaternary|
Li, X.S.; Berger, A.; Loutre, M.F. (1998). CO2 and northern hemisphere ice volume variations over the middle and Late quaternary. Clim. dyn. 14(7-8): 537-544
In: Climate Dynamics. Springer: Berlin; Heidelberg. ISSN 0930-7575, more
|Authors|| || Top |
- Li, X.S.
- Berger, A., more
- Loutre, M.F.
The atmospheric CO2 concentrations have been reconstructed over the past 600 ka based on regression between the Vostok CO2 data and the SPEC-MAP oxygen isotope values. A lag of 4.5 ka (CO2 preceding delta(18)O) gives the best results. A polynomial of order 5 explains 66% of the Vostok CO2 variance over the last 220 ka. The Northern Hemisphere ice-sheet volume was simulated over the past 575 ka using the LLN 2-D model, forced by insolation and these statistically reconstructed atmospheric CO2 concentrations. The simulated ice volume fluctuations resemble the deep-sea oxygen isotope variations. CO2 of interglacial level is necessary for explaining both the interglacial at oxygen isotopic stage 11 and our present-day interglacial.