This study investigates how carbon moves from the ocean surface to the depths in the equatorial Atlantic, contributing to long-term carbon storage. Using an Argo float equipped with a camera, we captured two periods with major carbon export events. By identifying particle types and their sinking behaviors, we found that smaller, compact particles are key drivers of carbon transport. Our findings underscore the value of using imaging tools on autonomous platforms in tracking carbon sequestration.

Humidification of air reduces the abundances of dry-air gas components such as oxygen, explaining why tropical humidity can be "stifling". This is overlooked due to the common expression of gas concentrations as fractions of dry air. Such neglect of water vapour also masks the key role of its sources and sinks in activating transport mechanisms of other gases. Humidity should be quantified whenever reporting gas concentrations.

Hydrothermal plumes of iron (Fe) have been observed to persist in the deep ocean, but the exact mechanisms that contribute to the long-range transport of Fe are not well defined. We collected plume waters from three different vent systems along the Mid-Atlantic Ridge and monitored the temporal evolution of the physical and chemical forms of iron and its interaction with organic matter over time to learn about the mechanisms that control its dispersion.

Net ecosystem and soil fluxes of the greenhouse gases methane (CH₄) and nitrous oxide (N₂O) were measured in a wet tropical forest. The measurements covered a 26-month period including contrasting seasons. The forest absorbed CH₄ during the driest season, and emitted it during the wettest season, while consistently emitting N₂O. The studied upland soils consistently absorb CH₄ but emit N₂O. Statistical models identified soil water content as one of the key drivers of these greenhouse gas fluxes.