ORCID Profile
0000-0002-0989-9310
Current Organisation
MetCorps
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Publisher: Wiley
Date: 2021
DOI: 10.1002/AGG2.20141
Abstract: In the stable conditions prevailing at night, concentrations of emitted gases (e.g., radon [Rn], carbon dioxide [CO 2 ] , methane [CH 4 ] , ammonia [NH 3 ], and nitrous oxide [N 2 O]) build up at the surface, with intermittent interruptions due to the passage of packets of turbulence. The applicability of conventional experimental methods is then questionable. Here, a statistical approach is proposed, in which micrometeorological field data are used to replicate the likely characteristics of a chamber experiment, yielding estimates of surface fluxes at the surface itself with reduced requirement for adequate fetch. Application of the virtual chamber methodology to two recent field studies is explored: (a) a study of nocturnal CO 2 emission from a farmland area in Ohio in 2015 and (b) an investigation of NH 3 effluxes from a crop previously treated with urea ammonium nitrate (UAN) in Illinois in 2014. For both datasets, the virtual chamber approach yields results in general agreement with eddy covariance (EC) data.
Publisher: Informa UK Limited
Date: 17-04-2020
Publisher: Springer Science and Business Media LLC
Date: 05-06-2020
Publisher: Elsevier BV
Date: 12-2023
Publisher: Elsevier BV
Date: 08-2020
Publisher: Springer Science and Business Media LLC
Date: 24-05-2021
Publisher: Springer Science and Business Media LLC
Date: 04-01-2022
Publisher: American Geophysical Union (AGU)
Date: 05-2021
DOI: 10.1029/2019JG005522
Abstract: Measurements of atmospheric ammonia (NH 3 ) concentrations and fluxes are limited in coastal regions in the eastern U.S. In this study, continuous and high temporal resolution measurements (5s) of atmospheric NH 3 concentrations were recorded using a cavity ring‐down spectrometer in a temperate tidal salt marsh at the St Jones Reserve (Dover, DE). Micrometeorological variables were measured using an eddy covariance system which is part of the AmeriFlux network (US‐StJ). Soil, plant, and water chemistry were also analyzed to characterize the sources and sinks of atmospheric NH 3 . A new analytical methodology was used to estimate the average ecosystem‐scale diurnal cycle of NH 3 fluxes by replicating the characteristics of a chamber experiment. This virtual chamber approach estimates positive surface fluxes in continuing strongly stable conditions when mixing with the air above is minimal. Our findings show that tidal water level may have a significant impact on NH 3 emissions from the marsh. The largest fluxes were observed at low tide when more soil was exposed. While it is expected that NH 3 fluxes will peak when the air temperature maximizes, high tide occurred concurrently with midday peaks in solar irradiance led to a decrease in NH 3 fluxes. Furthermore, soil, plant, and water chemistry measurements underpinning the NH 3 concentrations and fluxes lead us to conclude that this coastal wetland ecosystem can act as either a sink or a source of NH 3 . Such measurements provide novel data on which we can base reliable parameterizations to simulate NH 3 emissions from coastal salt marsh ecosystems using surface‐atmosphere transfer models.
Publisher: Springer Science and Business Media LLC
Date: 29-11-2020
Publisher: American Geophysical Union (AGU)
Date: 22-12-2016
DOI: 10.1002/2015JD024742
Location: Australia
No related grants have been discovered for Bruce Hicks.