A new study supported by ObsSea4Clim provides a multi-model statistical approach to the dispersion monitoring services in the Mediterranean.

There is growing concern about the impacts of short-term extreme conditions in the ocean, including marine heatwaves. In the summer of 2019, a marine heatwave occurred in the Northeast Pacific, similar to the “the Blob” marine heatwave event from 2013 to 2016. While we understand the atmospheric and oceanic drivers that caused this heatwave, we don’t fully understand how it affected the chemistry of the ocean. Using a tool called Ocetrac, along with new observation data and computer models, we studied the ocean’s chemical response to this marine heatwave. We found that warmer water in the upper ocean is linked to lower levels of carbon and oxygen. These findings illustrate the use of advanced tools to track the potential impact of marine heatwaves on ocean ecosystems.

Cite as:

Kohlman, C., Mogen, S., Cohen, J. T., Araujo, J., Beaudin, E., Bonino, G., et al. (2025). Surface and subsurface biogeochemical impacts of the 2019 Northeast Pacific marine heatwave. Geophysical Research Letters, 52, e2025GL115230. https://doi.org/10.1029/2025GL115230