S. K. Varney’s scientific contributions

... However, significant uncertainties remain in the global N 2 O budget [3], primarily due to substantial spatial and temporal variations in the biogenic N 2 O in-/out-flux. Historically, the known inputs (i.e., sources) of atmospheric N 2 O have been lower than the known outputs (i.e., sinks) [4][5][6][7][8], indicating that either the known input fluxes have been underestimated or unidentified sources may exist. Biogenic N 2 O production has traditionally been attributed solely to microbial nitrogen transformations, specifically nitrification, nitrifier-denitrification, and denitrification processes. ...

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Isotopic Signatures and Fluxes of N2O Emitted from Soybean Plants and Soil During the Main Growth Period of Soybeans

... Adequate representation of land-atmosphere processes in Earth system models is critical for accurate climate change projections (Garratt, 1993;Kabat et al., 1998;Barnett et al., 2005), hydrology (Anderson et al., 2012;Seiller et al., 2017), and forest management planning (Burger et al., 1999;Schoenholtz et al., 2000;Launiainen et al., 2019Launiainen et al., , 2022Goude et al., 2022). It has long been recognized that climate change is likely to have major impacts at high latitudes, such as in the circumpolar boreal biome (Houghton et al., 1990(Houghton et al., , 1992(Houghton et al., , 1996; the boreal forest, part of the circumpolar boreal biome, is the second largest biome on Earth (Landsberg and Gower, 1997) and covers nearly 30% of the world's land surface (FAO, 2001). It provides critical ecosystem services to northern populations (Brandt et al., 2013) and is responsible for a significant proportion of carbon, energy, and water fluxes at the Earth's surface (Gauthier et al., 2015). ...

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Impacts of forest canopy heterogeneity on plot-scale hydrometeorological variables -Insights from an experiment in the humid boreal forest with the Canadian Land Surface Scheme

... These focused on projected future emissions of greenhouse gases (GHGs). 78 Special Report on Emission Scenarios (SRES)-released in 2000 and used in the IPCC's Third Assessment Report (TAR) and Fourth Assessment Report (AR4). The SRES covers a wide range of the main drivers of climate change, from demographic to technological and economic developments, and includes all relevant GHGs and sulphur, and their driving forces. ...

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Climate change, malaria and neglected tropical diseases: a scoping review