The Canadian Atmospheric Model version 5 (CanAM5.0.3)

IF 4 3区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geoscientific Model Development Pub Date : 2023-09-22 DOI:10.5194/gmd-16-5427-2023

Jason Neil Steven Cole, Knut von Salzen, Jiangnan Li, John Scinocca, David Plummer, Vivek Arora, Norman McFarlane, Michael Lazare, Murray MacKay, Diana Verseghy

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引用次数: 1

Abstract

Abstract. The Canadian Atmospheric Model version 5 (CanAM5) is the component of Canadian Earth System Model version 5 (CanESM5) which models atmospheric processes and coupling of the atmosphere with land and lake models. Described in this paper are the main features of CanAM5, with a focus on changes relative to the last major scientific version of the model (CanAM4). These changes are mostly related to improvements in radiative transfer, clouds, and aerosol parameterizations, as well as a major upgrade of the land surface and land carbon cycle models and addition of a small lake model. In addition to changes to parameterizations and models, changes in the adjustable parameters between CanAM4 and CanAM5 are documented. Finally, the mean climatology simulated by CanAM5 for the present day is evaluated against observations and compared with that simulated by CanAM4. Although many of the aspects of the simulated climate are similar between CanAM4 and CanAM5, there is a reduction in precipitation and temperature biases over the Amazonian basin, global cloud fraction biases, and solar and thermal cloud radiative effects, all of which are improvements relative to observations.

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加拿大大气模型第5版(CanAM5.0.3)

摘要加拿大大气模式第5版(CanAM5)是加拿大地球系统模式第5版(CanESM5)的组成部分，它模拟大气过程以及大气与陆地和湖泊模式的耦合。本文描述了CanAM5的主要特征，重点介绍了相对于该模型的最后一个主要科学版本(CanAM4)的变化。这些变化主要与辐射传输、云和气溶胶参数化的改进，以及陆地表面和陆地碳循环模式的重大升级和小湖泊模式的增加有关。除了参数化和模型的变化之外，还记录了CanAM4和CanAM5之间可调参数的变化。最后，根据观测结果对CanAM5模拟的当前平均气候学进行了评估，并与CanAM4模拟的结果进行了比较。尽管CanAM4和CanAM5模拟气候的许多方面相似，但亚马逊流域的降水和温度偏差、全球云分数偏差以及太阳和热云辐射效应都有所减少，所有这些都相对于观测结果有所改善。

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来源期刊

Geoscientific Model Development GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

8.60

自引率

9.80%

发文量

352

审稿时长

6-12 weeks

期刊介绍： Geoscientific Model Development (GMD) is an international scientific journal dedicated to the publication and public discussion of the description, development, and evaluation of numerical models of the Earth system and its components. The following manuscript types can be considered for peer-reviewed publication: * geoscientific model descriptions, from statistical models to box models to GCMs; * development and technical papers, describing developments such as new parameterizations or technical aspects of running models such as the reproducibility of results; * new methods for assessment of models, including work on developing new metrics for assessing model performance and novel ways of comparing model results with observational data; * papers describing new standard experiments for assessing model performance or novel ways of comparing model results with observational data; * model experiment descriptions, including experimental details and project protocols; * full evaluations of previously published models.