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Quantifying atmospheric stability conditions at a swine facility and an adjacent corn field in Iowa, USA

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Abstract

Atmospheric stability conditions in the atmospheric surface layer control the distance and direction of transport of air contaminants. Near confined animal facilities, transport processes significantly impact air quality as these sites typically act as point sources of dust and odor constituents; however, little information is available on atmospheric stability effects. This study was conducted to assess year-round temporal patterns of atmospheric stability at a swine production facility and an adjacent commercial corn field (CF) in the US Midwest. Two towers of 10 and 20 m heights for continuous micrometeorological measurements were deployed within a CF and between swine buildings (BSB), respectively. Each tower was equipped with an eddy-covariance system at 6.8 m height, infrared thermometers, and six cup anemometers with thermocouples installed at log-distributed heights. Overall results from gradient Richardson number and Monin–Obukhov (z/L) calculations revealed a greater prevalence of unstable conditions for BSB compared with CF. During the 13-month measurement period, unstable cases (z/L ranging from −1 to −0.01) occurred 1.4 times more frequently for BSB than CF (52 vs. 39%, respectively), while stable cases (0.011–0.2) were 1.8 times more frequent for CF than BSB (24 vs. 14%, respectively). These patterns were partly associated with higher surface radiometric temperatures for BSB. Relatively greater diurnal heat capture at BSB (ground and roof surfaces) and a cooling effect in CF through active canopy transpiration during the daytime explain these z/L and radiometric temperature results. Prevalent diurnal atmospheric instability at BSB suggests enhanced ascendant vertical transport of air pollutants perhaps causing greater mixing/dilution with the atmospheric layer and/or their facilitated transport over greater distances when sorbed onto particles. This enhanced understanding of the spatio-temporal patterns of atmospheric stability can be subsequently applied in further studies for identifying effective odor mitigation strategies near commercial animal production facilities.

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Acknowledgments

We sincerely thank Kevin Jensen, Kathleen Lewis, Forrest Goodman, Richard Pfeiffer, Allison Schlapkohl, Timothy Hart, and David E. James for their valuable technical assistance including installation and maintenance of the field instrumentation. Also, appreciation is extended to Kent J. Schwartz for facilitating the implementation of this study on his farm.

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Correspondence to Guillermo Hernandez-Ramirez.

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Hernandez-Ramirez, G., Sauer, T.J., Hatfield, J.L. et al. Quantifying atmospheric stability conditions at a swine facility and an adjacent corn field in Iowa, USA. Theor Appl Climatol 105, 495–503 (2011). https://doi.org/10.1007/s00704-011-0405-0

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  • DOI: https://doi.org/10.1007/s00704-011-0405-0

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