This study addresses the fate of permafrost carbon mobilised by retrogressive thaw slumps, one of the most dynamic forms of abrupt Arctic permafrost degradation. Because permafrost carbon feedbacks represent a key uncertainty in climate change projections, improved constraints on the age and stability of thaw-mobilised carbon are of broad scientific relevance. By linking activation energy distributions with thermally resolved radiocarbon measurements, the authors provide a mechanistic perspective on the stability of particulate carbon exported from thaw slumps, offering insights that will be of interest to the wider geoscience community working on Arctic carbon cycling and climate feedbacks.

Coastal marshes play an important role in climate regulation and ecosystem services. This study provides the first large-scale assessment of carbon storage in Nordic coastal marshes, a region currently underrepresented in global blue carbon datasets. It shows how grazing management and environmental conditions jointly influence carbon storage and vegetation structure.

This study demonstrated, through an ocean alkalinity enhancement (OAE) experiment using mesocosms, that higher pH levels can reduce the ratio of biogenic silica to particulate organic carbon in sinking particles by promoting the dissolution of diatom-derived silica in seawater. Higher pH conditions might also cause organic carbon produced by diatoms to be remineralized at shallower depths, thereby reducing its ocean residence time and weakening the biological carbon pump for sequestering atmospheric carbon dioxide. This study also provides valuable insights into the linkage between OAE and biogeochemical processes in the ocean.

This study documents exceptionally well-preserved microbial biosignatures within Pleistocene reefal microbialites recovered from the Hawaiian Drowned Reefs during IODP Expedition 389, including calcified exopolymeric substances, microbial filaments, and putative cyanobacterial structures rarely preserved in marine carbonate environments. The remarkable quality of preservation provides direct evidence for the role of euphotic microbial mat communities in reef microbialite formation and offers a rare opportunity to reconstruct microbial community structure and environmental conditions through time. These findings highlight the value of reefal microbialites as archives of past microbial ecosystems and environmental change during Quaternary climate fluctuations.

This study uses advanced statistical modeling to identify regional isolation and the Mid-Atlantic Barrier as dominant drivers over local environmental selection in reefal meiofauna. The high endemism of the eastern Atlantic fauna provides an important missing piece for understanding tropical marine community assembly and dispersal filters across oceanic basins.