Climate variability-induced uncertainty in mid-Holocene atmosphere-ocean-vegetation feedbacks

被引:6
作者
Otto, J. [1 ,2 ]
Raddatz, T. [1 ]
Claussen, M. [1 ,3 ]
机构
[1] Max Planck Inst Meteorol, D-20146 Hamburg, Germany
[2] Int Max Planck Res Sch Earth Syst Modelling, Hamburg, Germany
[3] Univ Hamburg, Inst Meteorol, D-2000 Hamburg, Germany
关键词
COUPLED MODEL; SIMULATIONS; CIRCULATION;
D O I
10.1029/2009GL041457
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Previous modelling studies have shown that the response of the ocean and the vegetation to mid-Holocene insolation feeds back on the climate. There is less consensus, however, on the relative magnitude of the two feedbacks and the strength of the synergy between them. This discrepancy may arise partly from the statistical uncertainty caused by internal climate variability as the common analysis period is only about a century. Therefore, we have performed an ensemble of centennial-scale simulations using the general circulation model ECHAM5/JSBACH-MPIOM. The direct atmospheric response and the weak atmosphere-vegetation feedback are statistically robust. The synergy is always weak and it changes sign between the ensemble members. The simulations, including a dynamic ocean, show a large variability at sea-ice margins. This variability leads to a sampling error which affects the magnitude of the diagnosed feedbacks. Citation: Otto, J., T. Raddatz, and M. Claussen (2009), Climate variability-induced uncertainty in mid-Holocene atmosphere-ocean-vegetation feedbacks, Geophys. Res. Lett., 36, L23710, doi:10.1029/2009GL041457.
引用
收藏
页数:5
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