海洋热浪(MHW)等极端气候事件变得越来越频繁,激烈,并在世界各地持续更长的时间。这些异常温暖时期的后果对海洋生态系统具有破坏性。尽管如此,人们对伊比利亚西海岸附近的这些极端事件知之甚少。在这里,我们分析了1982年至2020年在阿威罗海岸发生的MHW事件,葡萄牙伊比利亚西部海岸。该地区共检测到79个事件,平均持续时间为15.8天,并且平均强度为1.9°C±0.4°C,高于该地区海表温度(SST)的第90个百分位数。在过去十年中,事件的最大强度增加了0.5°C。SST之间的关系,因此,MHW事件,北大西洋涛动指数(NAO)并确定了区域伊比利亚上升流指数(UI)。该地区强烈的上升流似乎减轻了变暖条件的持续时间,导致较短的MHW事件。此外,研究了SST和MHW事件对Carcinusmaenasmegalopae供应模式的影响,利用在RiadeAveiro入口处收集的2002、2006-2009、2012和2013年的每日数据。互相关用于评估SST对巨球菌供应的影响,而普通的最小二乘累积和用于识别随时间的变化。注意到SST对供应的影响有5到11天的滞后,但是这种关系多年来发生了变化。与我们的假设相反,我们没有发现证据支持MHW事件导致的巨球菌供应减少.这些难以捉摸的发现,再加上这些极端事件显然缺乏影响,突出了该地区MHW事件的相对较弱的强度和短暂的持续时间,再加上这些物种的高耐热性。
Extreme climatic events like marine heatwaves (MHWs) are becoming more frequent, intense, and longer lasting all around the world. The consequences of these anomalously warm periods are devastating for marine ecosystems. Still, little is known about these extreme events off the western Iberia coast. Here we analyzed MHW events occurring from 1982 to 2020 on the Aveiro coast, western Iberia coast of Portugal. A total of 79 events were detected for the region, with an average duration of 15.8 days, and a mean intensity of 1.9 °C ± 0.4 °C above the 90th percentile of sea surface temperatures (SST) for the region. The maximum intensity of the events has increased by 0.5 °C over the last decade. The relation between SST, and therefore, MHW events, the North Atlantic Oscillation index (NAO), and the regional Iberian Upwelling Index (UI) was identified. The intense upwelling of the region seems to mitigate the duration of warming conditions, resulting in shorter MHW events. Furthermore, the impacts of SST and MHW events on the supply patterns of Carcinus maenas megalopae were examined, utilizing daily data from 2002, 2006-2009, 2012, and 2013, collected at the entrance of Ria de Aveiro. Cross-correlations were employed to assess the effect of SST on megalopae supply, while ordinary least square cumulative sums were used to identify variations over time. The influence of SST on supply was noticed with a 5-to-11-day lag, but this relation changed over the years. Contrary to our hypothesis, we found no evidence supporting a diminishment in megalopae supply due to MHW events. These elusive findings, coupled with the apparent lack of influence of these extreme events, highlight the relatively weak intensity and brief duration of the MHW events in the region, coupled with the high thermal tolerance of these species.