We revisited the partitioning of the Mediterranean Sea into bioregions by processing satellite Sea Surface Temperature (SST) and Chlorophyll‐a concentration (Chla) from ocean color observations combined with Argo mixed‐layer depth for a period ranging from 2003 up to 2020. This regionalization was performed using an innovative classification based on self‐organizing maps, the so‐called 2S‐SOM. We clustered the Mediterranean Sea waters into seven bioregions governed by specific physical and biogeochemical characteristics. We studied the interannual variability of these bioregions over the 18 years. We showed that the temperature is increasing with a mean rate of 0.4°C per decade. The chlorophyll‐a concentration is quasi constant, but we evidenced a noticeable change in satellite‐derived phytoplankton communities: Diatoms concentration is decreasing while cyanobacteria concentration is increasing. The bioregion trends could be related to global warming. The whole Mediterranean Sea is shifting to an eastern Mediterranean state.

中文翻译：

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通过生物区域化方法论证气候变化对地中海浮游植物群落的影响

我们重新地中海划分成生物区通过处理卫星海表面温度（SST）和叶绿素一个从海洋颜色与观测Argo的组合浓度（叶绿素a）的混合层深度的操作时间范围从2003到2020年这区域化使用基于自组织图（即所谓的2S-SOM）的创新分类来执行。我们将地中海水域划分为七个受特定物理和生物地球化学特征控制的生物区域。我们研究了这些生物区域在18年中的年际变化。我们表明温度每十年平均升高0.4°C。叶绿素a硅藻的浓度是准恒定的，但我们证明了卫星来源的浮游植物群落的显着变化：硅藻的浓度在降低，而蓝细菌的浓度在增加。生物区域趋势可能与全球变暖有关。整个地中海正在向地中海东部转移。