The Pacific Decadal Oscillation modulated marine heatwaves in the Northeast Pacific during past decades
The Pacific Decadal Oscillation modulated marine heatwaves in the Northeast Pacific during past decades
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DOI：
10.1038/s43247-023-00863-w
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Xianglin Ren;Wei Liu;A. Capotondi;D. Amaya;N. Holbrook
中科院分区：
文献类型：
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作者：
Xianglin Ren;Wei Liu;A. Capotondi;D. Amaya;N. Holbrook
近几十年来，太平洋年代际振荡在东北太平洋海洋热浪的驱动中起着重要的作用。在这里，我们结合联合收割机的观测和气候模式模拟表明，海洋热浪变得更长，更强，更频繁的东北太平洋海岸下一个积极的太平洋年代际振荡的情况下，不像是在一个负的太平洋年代际振荡的情况下发现的。这主要是由于两个太平洋年代际振荡阶段之间的不同平均状态的海面温度。与太平洋年代际振荡的冷（负）阶段相比，在太平洋年代际振荡的正阶段，由于沿海冷上升流减少和净向下表面热通量增加，沿海海面温度升高。模型结果表明，相对于人为全球变暖的背景，2013-2022年期间的正太平洋年代际涛动将海洋热浪持续时间延长了43%，并将东北太平洋海岸的海洋热浪年频率增加了32%。
The Pacific Decadal Oscillation has been suggested to play an important role in driving marine heatwaves in the Northeast Pacific during recent decades. Here we combine observations and climate model simulations to show that marine heatwaves became longer, stronger and more frequent off the Northeast Pacific coast under a positive Pacific Decadal Oscillation scenario, unlike what is found during a negative Pacific Decadal Oscillation scenario. This primarily results from the different mean-state sea surface temperatures between the two Pacific Decadal Oscillation phases. Compared to the cool (negative) phase of the Pacific Decadal Oscillation, warmer coastal sea surface temperatures occur during the positive Pacific Decadal Oscillation phase due to reduced coastal cold upwelling and increased net downward surface heat flux. Model results show that, relative to the background anthropogenic global warming, the positive Pacific Decadal Oscillation in the period 2013–2022 prolongs marine heatwaves duration by up to 43% and acts to increase marine heatwaves annual frequency by up to 32% off the Northeast Pacific coast.