This study explores the impact of modern climate change on single-celled, marine organisms in the Santa Barbara Basin called foraminifera. We collect their shells as they sink to the seafloor and compare our record (2014–2021) to previous studies (1993–1998). We find substantial decreases in total foraminifera and warm-water species. Likely influenced by ocean acidification and regional water circulation, these changes have implications for the marine carbon cycle, ecosystem, and fossil record.

We explored the possibilities of a Bayesian-based data assimilation algorithm to improve the wetland CH₄ flux estimates by a dynamic vegetation model. By assimilating CH₄ observations from 14 wetland sites, we calibrated model parameters and estimated large-scale annual emissions from northern wetlands. Our findings indicate that this approach leads to more reliable estimates of CH₄ dynamics, which will improve our understanding of the climate change feedback from wetland CH₄ emissions.

The Arctic is warming rapidly, altering carbon storage in Svalbard’s Kongsfjorden. Our study analyzed sediment cores to track organic carbon shifts over time. We found that increasing Atlantic Water inflow enhanced marine carbon while reducing land-derived inputs. These findings suggest that Atlantification is reshaping carbon sequestration in Arctic fjords, with broader implications for the Arctic carbon cycle.