While the Atlantic basin experienced the busiest hurricane season in 2020, the typhoon activity over the western North Pacific (WNP) was also record‐setting with no tropical cyclone (TC) formation in July 2020, which is the first time in available historical records. The unprecedented absence of TC formation is consistent with the extremely unfavorable large‐scale conditions that are linked to an anomalous anticyclonic circulation over the WNP, which results mainly from sea surface temperature (SST) anomalies across the tropical oceans. Numerical experiments suggest that the tropical Indian Ocean SST anomalies, which were warmest in July 2020 since 1965, play a dominant role in the anomalous WNP anticyclonic circulation, while the increased zonal SST gradient across the tropical Pacific and the Atlantic SST warming also have important contributions. This study suggests that the configuration of SST anomalies across the tropical basins is quite important to the WNP TC activity.

中文翻译：

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是什么导致了2020年7月空前的西北太平洋热带气旋的缺失？

大西洋盆地在2020年经历了最繁忙的飓风季节，而北太平洋西部（WNP）的台风活动也创下了纪录，到2020年7月没有热带气旋（TC）形成，这是有史以来的第一次。前所未有的无TC形成与极端不利的大规模条件相一致，后者与WNP上的反气旋异常循环有关，这主要是由热带海洋上的海表温度（SST）异常引起的。数值实验表明，自1965年以来2020年7月最热的热带印度洋海表温度异常，在WNP反气旋环流异常中起着主导作用，而热带太平洋和大西洋SST变暖的纬向SST梯度增加也有重要作用。这项研究表明，整个热带盆地海表温度异常的构造对WNP TC活动非常重要。