On the evolution of the oceanic component of the IPSL climate models from CMIP3 to CMIP5 : a mean state comparison
On the evolution of the oceanic component of the IPSL climate models from CMIP3 to CMIP5 : a mean state comparison
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关于 IPSL 气候模式从 CMIP3 到 CMIP5 海洋部分的演变：平均状态比较
DOI：
10.1016/j.ocemod.2013.09.001
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发表时间：
2013
期刊：
影响因子：
3.2
通讯作者：
G. Madec
中科院分区：
文献类型：
--
作者：
J. Mignot;D. Swingedouw;J. Deshayes;O. Marti;C. Talandier;R. Séférian;M. Lengaigne;G. Madec
本文分析了耦合模式比对项目（CMIP3）第三阶段使用的IPSL-CM4版本到CMIP5使用的IPSL-CM5A版本对拉普拉斯研究所（IPSL-CM）气候模式海洋分量（NEMO）演变对海洋平均状态的影响。在这两个版本之间进行了一些修改，特别是与生物地球化学模块的交互耦合，太阳辐射穿透的3波段模型，海洋底部的部分步骤和一组物理参数化，以改善湍流和潮汐混合影响的表示。一组强迫和耦合的实验被用来挑选出每一个这些修改的影响，更一般地说，海洋分量的演变对IPSL耦合模式族。主要的改进位于南大洋，那里的物理参数化，如部分台阶和潮汐混合，加强了水团的正压输送，特别是在南极环极流中，并确保更好地代表南极底部水团。然而，我们的分析强调，在强制配置中大幅改善海洋动力学的修改可能会产生或放大耦合配置中的偏差。特别是，生物地球化学循环与海洋动力学之间的辐射生物物理耦合的激活导致海洋平均状态的冷却。考虑到大量的自由度和潜在的补偿效应掩盖了一些偏差，这说明了改进和调整耦合气候模型的困难。
This study analyses the impact on the oceanic mean state of the evolution of the oceanic component (NEMO) of the climate model developed at Institut Pierre Simon Laplace (IPSL-CM), from the version IPSL-CM4, used for third phase of the Coupled Model Intercomparison Project (CMIP3), to IPSL-CM5A, used for CMIP5. Several modifications have been implemented between these two versions, in particular an interactive coupling with a biogeochemical module, a 3-band model for the penetration of the solar radiation, partial steps at the bottom of the ocean and a set of physical parameterisations to improve the representation of the impact of turbulent and tidal mixing. A set of forced and coupled experiments is used to single out the effect of each of these modifications and more generally the evolution of the oceanic component on the IPSL coupled models family. Major improvements are located in the Southern Ocean, where physical parameterisations such as partial steps and tidal mixing reinforce the barotropic transport of water mass, in particular in the Antarctic Circumpolar Current) and ensure a better representation of Antarctic bottom water masses. However, our analysis highlights that modifications, which substantially improve ocean dynamics in forced configuration, can yield or amplify biases in coupled configuration. In particular, the activation of radiative biophysical coupling between biogeochemical cycle and ocean dynamics results in a cooling of the ocean mean state. This illustrates the difficulty to improve and tune coupled climate models, given the large number of degrees of freedom and the potential compensating effects masking some biases.
影响因子：
14.6
作者：
Martijn Gough
通讯作者：
Martijn Gough