Environmental PHYSics LABoratory (EPHYSLAB), CIM-UVIGO, University of Vigo, Ourense, Spain.
CRETUS Institute, Group of Nonlinear Physics, Department of Particle Physics, University of Santiago de Compostela, Santiago de Compostela, Spain.
Sci Total Environ. 2021 May 10;768:144915. doi: 10.1016/j.scitotenv.2020.144915. Epub 2021 Jan 29.
Ocean warming as a consequence of climate change occurred during the last decades is not homogeneous. This is especially patent for coastal areas, where the warming is influenced by local processes that occur at different time and spatial scales. In this sense, plumes formed by rivers discharge can play a key role in sea surface temperature (SST) warming. SST trends for the coastal points affected by the plumes of the 19 world's mightiest rivers (south 60°N) and their oceanic counterparts were analyzed by means of NOAA's AVHRR OISST data over the period 1982-2019. Coastal areas affected by river plumes showed an annual less intense warming trend than observed at the adjacent ocean in all cases. In average, warming trend was 0.088 °C dec lower for coastal areas, ranging from 0.027 °C dec for Mekong and Irrawaddy/Salween River plume systems to 0.208 °C dec and 0.278 °C dec for Mississippi and Paraná River plumes. The differences in coastal-ocean warming obtained for rivers debouching into inland seas (Danube and Volga Rivers) are similar to the ones observed for the rest of the rivers, even if inland seas are prone to higher warming rates than open seas. As the main conclusion, river plumes seem to have the ability to modulate SST warming near coast within the current context of global warming.
由于气候变化，海洋在过去几十年里一直在变暖，但这种变暖并不均匀。这在沿海地区尤为明显，因为那里的变暖受到不同时间和空间尺度上发生的局部过程的影响。在这种情况下，河流排放形成的羽流在海表温度（SST）变暖中可能起着关键作用。本研究利用美国国家海洋和大气管理局（NOAA）的 AVHRR OISST 数据，分析了受世界上最强大的 19 条河流羽流（南纬 60°N）及其海洋对应物影响的沿海点的 SST 趋势，时间跨度为 1982 年至 2019 年。在所有情况下，受河流羽流影响的沿海地区的年变暖趋势都比相邻海洋观测到的要弱。平均而言，沿海地区的变暖趋势比相邻海洋低 0.088°C/dec，范围从湄公河和伊洛瓦底江/萨尔温江羽流系统的 0.027°C/dec 到密西西比河和巴拉那河羽流的 0.208°C/dec 和 0.278°C/dec。与其余河流相比，注入内陆海（多瑙河和伏尔加河）的河流的沿海-海洋变暖差异相似，即使内陆海比开阔海域更容易出现更高的变暖速率。作为主要结论，在当前全球变暖的背景下，河流羽流似乎有能力调节沿海地区的 SST 变暖。
