Representation of Modes of Variability in Six U.S. Climate Models
Representation of Modes of Variability in Six U.S. Climate Models
复制标题
美国六种气候模型中变异模式的表示
作者：
C. Orbe;Luke P. van Roekel;Á. Adames;A. Dezfuli;J. Fasullo;P. Gleckler;Jiwoo Lee;Wei Li;L. Nazarenko;G. Schmidt;K. Sperber;Ming Zhao
我们比较了六个美国气候模型组的几种变率模式的性能，重点是确定与以前的版本相比，最近的模型（包括参与耦合模型相互比较项目（CMIP）第6阶段的模型）的稳健改进。特别是，我们研究了Madden-Julian振荡（MJO），厄尔尼诺-南方涛动（ENSO），太平洋十年振荡（PDO），热带平流层准两年振荡（QBO）以及热带外变率的主要模态，包括南部环形模态（SAM），北方环形模态（NAM）[和密切相关的北大西洋涛动（NAO）]，以及太平洋-北美模式（PNA）。在可行的情况下，我们探索通过使用“中间”实验，利用CMIP 3/5和CMIP 6之间的模型版本，以及有针对性的灵敏度实验，其中个别建模参数被改变，驱动这些改进的过程。我们发现MJO和QBO以及与PDO和ENSO相关的遥相关模式有明显和系统的改善。一些增益来自更好的过程表示，而另一些增益（例如，QBO）从允许更大范围的相互作用的更高分辨率。我们的研究结果表明，随着时间的推移，多个气候模型组的增量开发过程导致更逼真的模拟。
We compare the performance of several modes of variability across six U.S. climate modeling groups, with a focus on identifying robust improvements in recent models [including those participating in phase 6 of the Coupled Model Intercomparison Project (CMIP)] compared to previous versions. In particular, we examine the representation of the Madden–Julian oscillation (MJO), El Niño–Southern Oscillation (ENSO), the Pacific decadal oscillation (PDO), the quasi-biennial oscillation (QBO) in the tropical stratosphere, and the dominant modes of extratropical variability, including the southern annular mode (SAM), the northern annular mode (NAM) [and the closely related North Atlantic Oscillation (NAO)], and the Pacific–North American pattern (PNA). Where feasible, we explore the processes driving these improvements through the use of “intermediary” experiments that utilize model versions between CMIP3/5 and CMIP6 as well as targeted sensitivity experiments in which individual modeling parameters are altered. We find clear and systematic improvements in the MJO and QBO and in the teleconnection patterns associated with the PDO and ENSO. Some gains arise from better process representation, while others (e.g., the QBO) from higher resolution that allows for a greater range of interactions. Our results demonstrate that the incremental development processes in multiple climate model groups lead to more realistic simulations over time.
影响因子：
4.4
作者：
Kim, Hyemi;Janiga, Matthew A.;Pegion, Kathy
通讯作者：
Pegion, Kathy