Previous studies have revealed that warm (cold) sea surface temperature (SST) anomalies in the northern tropical Atlantic (NTA) can enhance (weaken) the anomalous low-level anticyclone over the western North Pacific (WNP) during boreal summer. This study assesses the ability of current atmospheric general circulation models (AGCMs) to simulate such an NTA–WNP connection by using Atmospheric Model Intercomparison Project experiments from 23 Coupled Model Intercomparison Project Phase 5 (CMIP5) and 35 CMIP6 climate models. It is shown that both the CMIP5 and CMIP6 multimodel ensemble (MME) averages and the majority of the individual AGCMs can reasonably reproduce the observed pattern of the NTA-related anomalous anticyclone over the WNP during boreal summer. Overall, the performance of the CMIP6 AGCMs in representing the NTA–WNP connection is similar to that of the CMIP5 AGCMs, except that the former tends to have a smaller spread than the latter among models. Additionally, both the CMIP5 and CMIP6 MME averages as well as the individual models can reasonably represent the mechanism responsible for the boreal summer NTA–WNP connection, which involves a zonally westward-extending overturning circulation over the Pacific–Atlantic Oceans. Furthermore, the intensity of the NTA-related WNP anomalous anticyclone is positively correlated with that of the WNP local climatological convection activity for both the CMIP5 and CMIP6 AGCMs, implying that better representation of the WNP climatological convection activity may be crucial for improving the skill of AGCMs to simulate the boreal summer NTA–WNP connection. However, model bias in the simulation of climatological convection activity over the WNP remains large for the current CMIP6 AGCMs, although the bias is reduced over most of the tropical and subtropical Pacific–Atlantic regions compared to that for the CMIP5 AGCMs during boreal summer.

先前的研究表明，北部热带大西洋（NTA）的温暖（冷）海表温度（SST）异常可以增强（减弱）北方夏季北太平洋（WNP）西部异常的低水平反旋风。这项研究通过使用来自23个耦合模型比较项目阶段5（CMIP5）和35个CMIP6气候模型的大气模型比较项目实验，评估了当前大气总循环模型（AGCM）模拟此类NTA-WNP连接的能力。结果表明，CMIP5和CMIP6多模型集合（MME）的平均值以及大多数单个AGCM都可以合理地重现北方夏季WNP上NTA相关异常反气旋的观测模式。总体，CMIP6 AGCM在表示NTA-WNP连接方面的性能与CMIP5 AGCM相似，不同之处在于前者的传播范围往往小于后者。此外，CMIP5和CMIP6 MME平均值以及各个模型都可以合理地代表造成北半球夏季NTA-WNP连接的机制，这涉及太平洋-大西洋向纬向扩展的区域性向西扩展。此外，对于CMIP5和CMIP6 AGCM，与NTA相关的WNP异常反旋风的强度与WNP局部气​​候对流活动的强度呈正相关，这意味着更好地表示WNP气候对流活动可能对提高对流技术的技能至关重要。 AGCM模拟夏季的夏季NTA-WNP连接。