Publications by authors named "Malte J Deventer"
Changing precipitation has the potential to alter nitrous oxide (N O) emissions from agricultural regions. In this study, we applied the Coupled Model Intercomparison Project Phase 5 end-of-century RCP 8.5 (business as usual) precipitation projections for the U.
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- - The study focuses on methyl bromide (CHBr) and methyl chloride (CHCl), which are important contributors to ozone depletion in the atmosphere, highlighting that there are still unknown sources of these compounds.
- - Researchers found that the presence of copper(II), particularly copper sulfate, boosts the production of CHBr and CHCl from soil and seawater, with this effect possibly increased by factors like hydrogen peroxide or solar radiation.
- - The findings suggest that the use of copper(II)-based pesticides in agriculture and anthropogenic copper(II) discharge into oceans might explain some of the previously unidentified sources of CHBr and CHCl, adding to the atmospheric levels of these substances.
Article Synopsis
- The study uses airborne measurements across different seasons to analyze methane emissions in the US Corn Belt and Upper Midwest, focusing on natural and anthropogenic sources.
- It finds that wetlands are the largest methane source, while livestock contribute significantly as the major human-related source, with implications for emission management.
- The research highlights discrepancies in methane estimates from different agricultural practices and suggests improvements in management strategies for livestock to effectively mitigate emissions.
Terrestrial ecosystems are simultaneously the largest source and a major sink of volatile organic compounds (VOCs) to the global atmosphere, and these two-way fluxes are an important source of uncertainty in current models. Here, we apply high-resolution mass spectrometry (proton transfer reaction-quadrupole interface time-of-flight; PTR-QiTOF) to measure ecosystem-atmosphere VOC fluxes across the entire detected mass range 0-335) over a mixed temperate forest and use the results to test how well a state-of-science chemical transport model (GEOS-Chem CTM) is able to represent the observed reactive carbon exchange. We show that ambient humidity fluctuations can give rise to spurious VOC fluxes with PTR-based techniques and present a method to screen for such effects.
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