Some questions remain concerning the record‐breaking 2013–2015 Northeast Pacific marine heatwave (MHW) event: was it exceptional or merely the most pronounced of a group of similar events, and was its intensity and multiyear duration driven by internal extratropical processes or did the tropics play an important role? By analyzing the statistical behavior of the historical MHWs within the ERSST.v3 data set over the 1950–2019 period, we find that Northeast Pacific MHWs occurred over a continuum of intensities and durations, suggesting that these events are a recurrent Pacific phenomenon. These statistics and corresponding composite evolution are dynamically reproduced by a large ensemble simulation of a Pacific Linear Inverse Model, thereby providing a greater range of MHW expressions than the short observational record alone. Consistent with the 2013–2015 event's evolution, we find that overall the tropics influence MHWs primarily by increasing their duration, while MHW intensity is related to the initial extratropical anomalies.

中文翻译：

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东北太平洋海洋热浪的连续统及其与热带太平洋的关系

关于破纪录的2013-2015年东北太平洋海洋热浪（MHW）事件，仍然存在一些问题：这是一次例外事件，还是仅仅是一组类似事件中最明显的一次；其强度和多年持续时间是由内部温带过程驱动的吗？热带起重要作用？通过分析ERSST.v3数据集在1950-2019年期间的历史MHW的统计行为，我们发现东北太平洋MHW发生在强度和持续时间的连续范围内，这表明这些事件是太平洋复发现象。这些统计数据和相应的合成演化是通过太平洋线性逆模型的大型整体模拟动态地重现的，从而比单独的短观测记录提供了更大范围的MHW表达式。