Publications by authors named "A J Dolman"
Long-term atmospheric CO concentration records have suggested a reduction in the positive effect of warming on high-latitude carbon uptake since the 1990s. A variety of mechanisms have been proposed to explain the reduced net carbon sink of northern ecosystems with increased air temperature, including water stress on vegetation and increased respiration over recent decades. However, the lack of consistent long-term carbon flux and in situ soil moisture data has severely limited our ability to identify the mechanisms responsible for the recent reduced carbon sink strength.
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- Arctic warming is impacting snow cover and soil hydrology, which in turn affects carbon sequestration in tundra ecosystems.
- A study using 119 site-years of data revealed that earlier snowmelt boosts carbon sequestration and plant productivity in early summer (June-July) but reduces them in August.
- Despite higher evapotranspiration leading to potential soil drying, earlier snowmelt did not significantly decrease soil moisture, suggesting that without continued carbon uptake in late summer, the benefits of a longer growing season may not be realized.
Introduction: Political polarization has increased in the USA within recent years. Studies have shown Republicans are less likely to accept COVID-19 vaccinations than Democrats; however, little is known regarding the association between COVID-19 vaccination acceptance and political polarization.
Methods: We used data from a nationally-representative survey of 1427 participants conducted between 9 February 2021 and 17 February 2021.
Northern peatlands store large amounts of carbon. Observations indicate that forests and peatlands in northern biomes can be alternative stable states for a range of landscape settings. Climatic and hydrological changes may reduce the resilience of peatlands and forests, induce persistent shifts between these states, and release the carbon stored in peatlands.
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- Digital technologies can objectively detect symptoms of depression, allowing for the collection of extensive relevant data that traditional methods may miss.
- A study was conducted with 20 participants having unipolar depression and 20 healthy controls to test the effectiveness of several digital technologies as potential diagnostic tools.
- Various digital assessments were used, both in-clinic and through mobile apps, including mood self-assessments, cognitive tests, behavioral monitoring, and advanced neural analysis techniques.