Abstract In intertidal environments, temperature changes at hourly scales are ecologically relevant because of the physiological stress that organisms must endure as a result. Tides constitute the main source of such changes, as low tides periodically expose intertidal habitats to aerial conditions, which can exhibit extreme high and low temperatures in summer and winter, respectively. This study identifies a source of strong hourly thermal variation that acts upon seawater temperature. Hours after the arrival of cyclone Dorian to the Atlantic Canadian coast in September 2019, intertidal loggers revealed that sea surface temperature (SST) decreased by 10–12 °C. Online data indicated that neither tidal amplitude nor air temperature were responsible for this marked SST drop. Conversely, data on wind speed and direction strongly suggest that a pronounced spike in coastal upwelling caused by this cyclone drove the sharp drop in intertidal SST. Bakun's upwelling index, for instance, peaked at 689 m3 s−1 (100 m of coastline)−1 a few hours after Dorian's landfall. It remains to be seen how this marked SST drop may have affected intertidal organisms, as they were then acclimated to summer conditions. As the frequency and intensity of cyclones are predicted to increase with climate change in temperate latitudes, cyclone-related intertidal thermal ecology might deserve further attention.

中文翻译：

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气旋多里安到达加拿大大西洋沿岸后上升流峰值和显着的海温下降

摘要 在潮间带环境中，由于生物体必须承受生理压力，因此每小时尺度的温度变化具有生态相关性。潮汐是这种变化的主要来源，因为低潮会周期性地将潮间带栖息地暴露在空气条件下，夏季和冬季分别会出现极端高温和低温。这项研究确定了影响海水温度的强烈每小时热变化的来源。在 2019 年 9 月气旋多里安抵达加拿大大西洋沿岸数小时后，潮间带记录仪显示海面温度 (SST) 下降了 10-12°C。在线数据表明，潮汐幅度和气温都不是造成这种显着海温下降的原因。反过来，关于风速和风向的数据强烈表明，由该旋风引起的沿海上升流的显着峰值推动了潮间带海温的急剧下降。例如，巴昆的上升流指数在多里安登陆几小时后达到峰值 689 m3 s-1（100 m 海岸线）-1。这种显着的 SST 下降可能如何影响潮间带生物还有待观察，因为它们随后适应了夏季条件。由于预计气旋的频率和强度会随着温带地区的气候变化而增加，因此与气旋相关的潮间带热生态可能值得进一步关注。这种显着的 SST 下降可能如何影响潮间带生物还有待观察，因为它们随后适应了夏季条件。由于预计气旋的频率和强度会随着温带地区的气候变化而增加，因此与气旋相关的潮间带热生态可能值得进一步关注。这种显着的 SST 下降可能如何影响潮间带生物还有待观察，因为它们随后适应了夏季条件。由于预计气旋的频率和强度会随着温带地区的气候变化而增加，因此与气旋相关的潮间带热生态可能值得进一步关注。