The Brewer-Dobson circulation in a changing climate : import of the model configuration
The Brewer-Dobson circulation in a changing climate : import of the model configuration
复制标题
气候变化中的布鲁尔-多布森环流:模型配置的导入
DOI:
10.1175/jas-d-12-0215.1
复制
发表时间:
2013
影响因子:
3.1
通讯作者:
H. Schmidt
中科院分区:
文献类型:
--
作者:
Bunzel;H. Schmidt
Most climate models simulate a strengthening of the Brewer–Dobson circulation (BDC) under a changing climate. However, the magnitude of the trend as well as the underlying mechanisms varies significantly among the models. In this work the impact of both vertical resolution and vertical extent of a model on the simulated BDC change is investigated by analyzing sensitivity simulations performed with the general circulation model ECHAM6 in three different model configurations for three different climate states. Tropical upwelling velocities and age of stratospheric air are used as measures for the strength of the BDC. Both consistently show a BDC strengthening from the preindustrial to the future climate state for all configurations of the model. However, the amplitude and origin of this change vary between the different setups. Analyses of the tropical upward mass flux indicate that in the model with a lid at 10 hPa the BDC strengthening at 70 hPa is primarily produced by resolved wave drag, while in the model with a higher lid (0.01 hPa) the parameterized wave drag yields the main contribution to the BDC increase. This implies that consistent changes in the BDC originate from different causes when the stratosphere is not sufficiently resolved in a model. Furthermore, the effect of enhancing the horizontal diffusion in the upper model layers to avoid resolved wave reflection at the model lid is quantified, and a possible link to the different behavior of the low-top model with regard to the origin of the BDC change is identified.
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DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
E. Manzini;J. Feichter
通讯作者:
J. Feichter
影响因子:
3.1
作者:
T. Shaw;T. Shepherd
通讯作者:
T. Shepherd
影响因子:
4.6
作者:
Butchart, N.;Scaife, A. A.;Sigmond, M.
通讯作者:
Sigmond, M.
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
R. Garcia;W. Randel;D. Kinnison
通讯作者:
D. Kinnison
影响因子:
6.8
作者:
Schmidt;Bunzel;Giorgetta;Krismer;Stenchikov;Timmreck;Tomassini
通讯作者:
Tomassini