Simulating the mid-Pliocene climate with the MIROC general circulation model: experimental design and initial results
Simulating the mid-Pliocene climate with the MIROC general circulation model: experimental design and initial results
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DOI：
10.5194/gmd-4-1035-2011
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发表时间：
2011-01-01
影响因子：
5.1
通讯作者：
Ohgaito, R.
中科院分区：
文献类型：
--
作者：
Chan, W. -L.;Abe-Ouchi, A.;Ohgaito, R.
最近，PlioMIP（上新世模型相互比较项目）成立，以评估各种气候模型模拟330 - 300万年前上新世中期温暖期（mPWP）的能力。我们使用MIROC 4 m，一个完全耦合的大气-海洋环流模式（AOGCM），它的大气成分单独模拟mPWP，利用最新的数据集指定在PlioMIP作为边界条件，并坚持所概述的协议。在本文中，该模型的简要说明，其次是解释的实验设计和实施的边界条件，如地形和海面温度。初步结果显示，高纬度地带的纬向平均地表气温上升了约10摄氏度，同时赤道到两极的温度梯度下降。在AOGCM中，热带地区的温度增加更多。然而，AOGCM在北大西洋和北欧海北方部分海面的变暖程度低于替代数据所显示的。对模式数据差异的调查和进一步的模式相互比较研究可以更好地了解上新世中期的气候及其在评估未来气候变化中的作用。
Recently, PlioMIP (Pliocene Model Intercomparison Project) was established to assess the ability of various climate models to simulate the mid-Pliocene warm period (mPWP), 3.3-3.0 million years ago. We use MIROC4m, a fully coupled atmosphere-ocean general circulation model (AOGCM), and its atmospheric component alone to simulate the mPWP, utilizing up-to-date data sets designated in PlioMIP as boundary conditions and adhering to the protocols outlined. In this paper, a brief description of the model is given, followed by an explanation of the experimental design and implementation of the boundary conditions, such as topography and sea surface temperature. Initial results show increases of approximately 10 degrees C in the zonal mean surface air temperature at high latitudes accompanied by a decrease in the equator-to-pole temperature gradient. Temperatures in the tropical regions increase more in the AOGCM. However, warming of the AOGCM sea surface in parts of the northern North Atlantic Ocean and Nordic Seas is less than that suggested by proxy data. An investigation of the model-data discrepancies and further model intercomparison studies can lead to a better understanding of the mid-Pliocene climate and of its role in assessing future climate change.