Publications by authors named "Jackie R Webb"
Article Synopsis
- Nitrogen pollution and global eutrophication are expected to increase nitrous oxide (NO) emissions from freshwater ecosystems, particularly in agricultural areas where small artificial waterbodies are often overlooked.
- A study found that 67% of these small reservoirs in Canada act as sinks for NO despite being highly eutrophic, indicating they absorb rather than emit NO.
- The research revealed that in situ NO concentrations are influenced by water stratification and nitrogen levels, and previous models significantly overestimated NO emissions from these waterbodies, suggesting a need to reevaluate our understanding of nutrient-rich waters.
Catchment headwaters comprise the majority of all stream length globally, however, carbon (C) dynamics in these systems remains poorly understood. We combined continuous measurements of pCO2 and radon ((222)Rn, a natural groundwater tracer) with discrete sampling for particulate organic, dissolved organic and inorganic carbon (POC, DOC, and DIC) to assess the short-term carbon dynamics of a pristine subtropical headwater stream in Australia, over contrasting hydrologic regimes of drought, flash-flooding and recovery. Observations over 23days revealed a shift from carbon losses dominated by CO2 outgassing under conditions of low flow (66.
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