Evaluation of the University of Victoria Earth System Climate Model version 2.10 (UVic ESCM 2.10)
Evaluation of the University of Victoria Earth System Climate Model version 2.10 (UVic ESCM 2.10)
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DOI：
10.5194/gmd-13-4183-2020
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发表时间：
2020-09-10
影响因子：
5.1
通讯作者：
Zickfeld, Kirsten
中科院分区：
文献类型：
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作者：
Mengis, Nadine;Keller, David P.;Zickfeld, Kirsten
维多利亚大学地球系统气候模型(UVic ESCM)具有中等复杂性，在最近的长期气候变化评估中是一个有用的工具，包括古气候模型和未来变暖的不确定性评估。自上一次正式发布UVic ESCM 2.9和过去十年的两次官方更新以来，多个研究小组进行了大量的模型开发。这里介绍的维多利亚大学地球系统气候模式的新版本2.10将是耦合模式相互比较项目(CMIP6)第六阶段的一部分。更确切地说，它将用于中等复杂性地球系统模型(EMIC)的相互比较，例如C4MIP、二氧化碳消除和零排放承诺模型相互比较项目(分别为CDRMIP和ZECMIP)。它现在汇集并结合了自上次正式发布模型以来出现的多个模型开发和新组件。对基本模型的主要补充是(I)改进的海洋生物地球化学模型，(Ii)包括动态水文和土壤碳过程的垂直分辨率土壤模型，以及(Iii)永久冻土碳的表示。为了为它的使用奠定基础，我们在这里描述UVic ESCM 2.10，并根据观测数据评估瞬变历史模拟的结果。我们发现，UVic ESCM 2.10模式能够很好地再现历史温度和碳通量的变化。许多海洋示踪剂的空间分布，包括温度、盐度、磷酸盐和硝酸盐，也与观测到的示踪剂剖面很好地吻合。海洋示踪剂的良好性能与海洋物理性质的改进表示有关。目前，仍然存在的主要偏差是热带植被的碳密度太高，海洋热含量(OHC)的变化高于观测到的变化，以及南大洋的氧气利用率太低。所有这些偏见将在该模型的下一次更新中得到解决。
The University of Victoria Earth System Climate Model (UVic ESCM) of intermediate complexity has been a useful tool in recent assessments of long-term climate changes, including both paleo-climate modelling and uncertainty assessments of future warming. Since the last official release of the UVic ESCM 2.9 and the two official updates during the last decade, considerable model development has taken place among multiple research groups. The new version 2.10 of the University of Victoria Earth System Climate Model presented here will be part of the sixth phase of the Coupled Model Intercomparison Project (CMIP6). More precisely it will be used in the intercomparison of Earth system models of intermediate complexity (EMIC), such as the C4MIP, the Carbon Dioxide Removal and Zero Emissions Commitment model intercomparison projects (CDRMIP and ZECMIP, respectively). It now brings together and combines multiple model developments and new components that have come about since the last official release of the model. The main additions to the base model are (i) an improved biogeochemistry module for the ocean, (ii) a vertically resolved soil model including dynamic hydrology and soil carbon processes, and (iii) a representation of permafrost carbon. To set the foundation of its use, we here describe the UVic ESCM 2.10 and evaluate results from transient historical simulations against observational data. We find that the UVic ESCM 2.10 is capable of reproducing changes in historical temperature and carbon fluxes well. The spatial distribution of many ocean tracers, including temperature, salinity, phosphate and nitrate, also agree well with observed tracer profiles. The good performance in the ocean tracers is connected to an improved representation of ocean physical properties. For the moment, the main biases that remain are a vegetation carbon density that is too high in the tropics, a higher than observed change in the ocean heat content (OHC) and an oxygen utilization in the Southern Ocean that is too low. All of these biases will be addressed in the next updates to the model.