Environmental influences on respirable dust production from agricultural operations in California
Identifieur interne : 000251 ( Istex/Corpus ); précédent : 000250; suivant : 000252Environmental influences on respirable dust production from agricultural operations in California
Auteurs : H. Clausnitzer ; M. J. SingerSource :
- Atmospheric Environment [ 1352-2310 ] ; 2000.
Abstract
Agricultural operations may contribute to the respirable dust (RD) that affects the air quality of California's Central Valley. In order to minimize RD production, it is necessary to understand the role of two of the more important variables that influence RD production, soil water content and air temperature. Personal cyclone samplers were mounted on agricultural implements used in farming operations over two years to capture ⩽4μm aerodynamic-diameter RD particles. For cultivation operations under widely different environmental conditions, RD concentration decreased as a power function as soil water content increased between 2 and 14% and increased linearly as air temperature increased. Similar results were found for an experiment with a land plane when samples were collected at 126, 156, 186, 216, 246, and 276cm above the soil surface with either soil water content or air temperature held constant. For some cultivation operations, RD increased as a power function of air temperature between 7 and 24°C. For a loam surface horizon at one sample site, RD concentration increased 2–5 times at 34°C compared to 18.6°C.
Url:
DOI: 10.1016/S1352-2310(99)00385-4
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<front><div type="abstract" xml:lang="en">Agricultural operations may contribute to the respirable dust (RD) that affects the air quality of California's Central Valley. In order to minimize RD production, it is necessary to understand the role of two of the more important variables that influence RD production, soil water content and air temperature. Personal cyclone samplers were mounted on agricultural implements used in farming operations over two years to capture ⩽4μm aerodynamic-diameter RD particles. For cultivation operations under widely different environmental conditions, RD concentration decreased as a power function as soil water content increased between 2 and 14% and increased linearly as air temperature increased. Similar results were found for an experiment with a land plane when samples were collected at 126, 156, 186, 216, 246, and 276cm above the soil surface with either soil water content or air temperature held constant. For some cultivation operations, RD increased as a power function of air temperature between 7 and 24°C. For a loam surface horizon at one sample site, RD concentration increased 2–5 times at 34°C compared to 18.6°C.</div>
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<notesStmt><note type="content">Fig. 1: Location of the University of California, Davis within California. The two experimental sites are within 11km of the Davis campus.</note>
<note type="content">Fig. 2: Respirable dust concentration as a function of soil water content for tillage operations. The equation for the line is Y=22.92X−2.03. The R2=0.932 and the error bars represent one standard deviation around the mean RD.</note>
<note type="content">Fig. 3: Respirable dust concentration in the morning as a function of volumetric soil water content and sampler height.</note>
<note type="content">Fig. 4: Respirable dust concentration as a function of air temperature for all cultivation operations.</note>
<note type="content">Fig. 5: Respirable dust concentration as a function of time of day and sampler height for a very hot summer day. Air temperature at time of sample collection and sample heights are shown above the sample points and individual curves, respectively.</note>
<note type="content">Fig. 6: Respirable dust concentration as a function of air temperature for disking-in stubble and plowing.</note>
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<abstract xml:lang="en"><p>Agricultural operations may contribute to the respirable dust (RD) that affects the air quality of California's Central Valley. In order to minimize RD production, it is necessary to understand the role of two of the more important variables that influence RD production, soil water content and air temperature. Personal cyclone samplers were mounted on agricultural implements used in farming operations over two years to capture ⩽4μm aerodynamic-diameter RD particles. For cultivation operations under widely different environmental conditions, RD concentration decreased as a power function as soil water content increased between 2 and 14% and increased linearly as air temperature increased. Similar results were found for an experiment with a land plane when samples were collected at 126, 156, 186, 216, 246, and 276cm above the soil surface with either soil water content or air temperature held constant. For some cultivation operations, RD increased as a power function of air temperature between 7 and 24°C. For a loam surface horizon at one sample site, RD concentration increased 2–5 times at 34°C compared to 18.6°C.</p>
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<abstract lang="en">Agricultural operations may contribute to the respirable dust (RD) that affects the air quality of California's Central Valley. In order to minimize RD production, it is necessary to understand the role of two of the more important variables that influence RD production, soil water content and air temperature. Personal cyclone samplers were mounted on agricultural implements used in farming operations over two years to capture ⩽4μm aerodynamic-diameter RD particles. For cultivation operations under widely different environmental conditions, RD concentration decreased as a power function as soil water content increased between 2 and 14% and increased linearly as air temperature increased. Similar results were found for an experiment with a land plane when samples were collected at 126, 156, 186, 216, 246, and 276cm above the soil surface with either soil water content or air temperature held constant. For some cultivation operations, RD increased as a power function of air temperature between 7 and 24°C. For a loam surface horizon at one sample site, RD concentration increased 2–5 times at 34°C compared to 18.6°C.</abstract>
<note type="content">Fig. 1: Location of the University of California, Davis within California. The two experimental sites are within 11km of the Davis campus.</note>
<note type="content">Fig. 2: Respirable dust concentration as a function of soil water content for tillage operations. The equation for the line is Y=22.92X−2.03. The R2=0.932 and the error bars represent one standard deviation around the mean RD.</note>
<note type="content">Fig. 3: Respirable dust concentration in the morning as a function of volumetric soil water content and sampler height.</note>
<note type="content">Fig. 4: Respirable dust concentration as a function of air temperature for all cultivation operations.</note>
<note type="content">Fig. 5: Respirable dust concentration as a function of time of day and sampler height for a very hot summer day. Air temperature at time of sample collection and sample heights are shown above the sample points and individual curves, respectively.</note>
<note type="content">Fig. 6: Respirable dust concentration as a function of air temperature for disking-in stubble and plowing.</note>
<note type="content">Table 1: Mean respirable dust concentration in the air produced by tillage operations on the LTRAS plots at 11 soil water content intervalsa</note>
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