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Regional recovery from microplastic pollution-induced marine deoxygenation may take hundreds of years, according to a combination of biogeochemical and microplastic modelling.
Marine phosphate levels and biological productivity were lowest during the early Phanerozoic when seafloor weathering rates were high and continental weathering rates were muted, according to a statistical model of coupled elemental cycles.
Manganese oxidation experiments in Mars-like fluids suggest that chlorate and bromate may have been more effective oxidants of manganese on early Mars than atmospheric oxygen and explain observed manganese oxide deposits.
Substantial nitrous oxide production in the epipelagic zone of the subtropical ocean partially offsets carbon sequestration by the marine biological pump, according to observations from the South China Sea and subtropical northwest Pacific.
Mixing dynamics at river confluences where shallow flows merge in rivers consist of switching between wake and mixing-layer modes, as shown in theoretical and field-scale physical modelling.
Carbon sequestration by Siberian forests has been low over the past decade due to disturbances that have decreased live biomass and increased dead wood, according to passive microwave observations.
East Antarctic surface temperature co-varied with local insolation in the Early Pleistocene, leading to the cancellation of global orbital ice sheet forcing from precession, according to temperature proxies and insolation-related gas ratios in ice cores.
Analyses of the temperature sensitivity of terrestrial carbon turnover suggest that hydrometeorology and temperature control the spatial variability in carbon turnover times globally.
Marine emissions of N2O could have sustained an early Archaean atmosphere of 0.8–6.0 ppb N2O without a protective ozone layer, according to mineral incubations combined with diffusion and photochemical modelling.
Two ice streams—indicated by buried folds—extending into the interior of the northeastern Greenland ice sheet deactivated in the Holocene as the drainage basin flow regime reorganized southwards, according to an analysis of radio-echo sounding data.
A large, slow-moving landslide underlying the city of Bukavu in the Democratic Republic of the Congo has accelerated in recent decades due to hydrological modifications related to urbanization, according to an analysis of aerial photographs and remote-sensing data.
The advance and retreat of the West Antarctic Ice Sheet were primarily paced by 41,000-year-long obliquity cycles, not longer eccentricity cycles, until 400,000 years ago, according to sedimentological and palaeomagnetic records from the Ross Embayment.
Field experiments suggest that long-term responses of soil respiration and carbon emissions to nitrogen deposition in tropical forests can be divided into different phases as soil environment and biological response change.
The amount and composition of carbon compounds released from plant roots into soil influences soil carbon formation and loss, according to an artificial root exudate experiment using intact soil cores from a temperate forest.
In situ measurements reveal that high pressure in the deep ocean doesn’t lead to elevated community-level microbial metabolic rates, in contrast to previous shipboard analyses made at atmospheric pressure.
Neoarchaean arc magmas in Superior Province, Canada, were relatively oxidized and sulfur rich, reaching compositions comparable to modern subduction zones by approximately 2.7 Ga, according to analysis of sulfur speciation in zircon-hosted apatite grains.
Ecosystem modelling suggests that a range of growth conditions and ecological selection of phytoplankton explain global patterns of C:N:P ratios in marine organic matter.
Accounting for deep, cross-shelf carbon export into the Nansen Basin increases the carbon sequestration of the Barents Sea region of the Arctic Ocean by some 30%, according to numerical modelling supported by observational data.
Disruption of sediment flows along the eastern Australia coast due to the Middle Pleistocene formation of Fraser Island set the stage for Great Barrier Reef initiation, according to optically stimulated luminescence and palaeomagnetic dating of sand dunes.
An analysis of elastic lithospheric thickness suggests most coronae on Venus form on thin lithosphere with heat flow similar to that of rift zones on Earth, supporting a planet with active rifting and a squishy-lid convective regime.