2025-11-06 カリフォルニア大学サンタバーバラ校
＜関連情報＞
- https://news.ucsb.edu/2025/022213/hotter-your-average-spa-rising-temps-amazon-lakes-sound-alarm-over-climate-change
- https://www.science.org/doi/10.1126/science.adr4029
気候変動によるアマゾン川の極端な温暖化 Extreme warming of Amazon waters in a changing climate
Ayan Santos Fleischmann, Fabrice Papa, Stephen K. Hamilton John Melack , […] , and Miriam Marmontel
Science Published:6 Nov 2025
DOI:https://doi.org/10.1126/science.adr4029
Editor’s summary
As global surface air temperatures continue to rise, so do the temperatures of individual components of our environment. Fleischmann et al. report an extreme example of that pattern: a simultaneous severe drought and heat wave in the Amazon in 2023. This combination led to high mortality of fishes and river dolphins, with the temperature of multiple lakes in the region studied reaching record highs and one entire lake reaching 41°C. Ongoing climate change likely will cause more instances like this where temperatures approach or exceed thermal tolerances for aquatic life. —Jesse Smith
Abstract
In 2023, an unprecedented drought and heat wave severely affected Amazon waters, leading to high mortality of fishes and river dolphins. Five of 10 lakes monitored had exceptionally high daytime water temperatures (over 37°C), with one large lake reaching up to 41°C in the entire approximately 2-meter-deep water column and up to 13°C of diel variation. Modeling showed that high solar radiation, reduced water depth and wind speed, and turbid waters were the main drivers of the high temperatures. This extreme heating of Amazon waters follows a long-term increase of 0.6°C/decade revealed by satellite estimates across the region’s lakes between 1990 and 2023. With ongoing climate change, temperatures that approach or exceed thermal tolerances for aquatic life are likely to become more common in tropical aquatic systems.
