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Particulate Matter Contributions from Agricultural Tilling Operations in an Irrigated Desert Region.

Qi M, Lin K, Li X, Sammis TW, Miller DR, Wang J - PLoS ONE (2015)

Bottom Line: Hourly data from three air quality monitoring stations positioned at a 2-m height located on the west and east mesas of New Mexico's Mesilla Valley and in the valley at Anthony, NM were acquired from the New Mexico Air Quality Bureau.The study spanned the agricultural tilling season, March 1 to April 30, for the years 2008 to 2012.One- second spatial PM10 concentrations at 200 m above the valley floor were measured during a two-hour controlled field tilling operation on April 1, 2008.

View Article: PubMed Central - PubMed

Affiliation: School of Science, Wuhan University of Technology, Wuhan, Hubei, P. R. China.

ABSTRACT
Sources of regional particulate matter (PM), particularly agricultural operations, must be understood in order to manage the air quality in irrigated dry climates. Direct monitoring measurements alone are useful, but not sufficient, to estimate regional PM source concentrations. This paper combines modeling with ground (point) and airplane (spatial) measurement methods to estimate regional PM10 (PM diameter≤10 μm) contributions from agricultural operations. Hourly data from three air quality monitoring stations positioned at a 2-m height located on the west and east mesas of New Mexico's Mesilla Valley and in the valley at Anthony, NM were acquired from the New Mexico Air Quality Bureau. The study spanned the agricultural tilling season, March 1 to April 30, for the years 2008 to 2012. One- second spatial PM10 concentrations at 200 m above the valley floor were measured during a two-hour controlled field tilling operation on April 1, 2008. The HYSPLIT 4.0 (Hybrid Single-Particle Lagrangian Integrated Trajectory version 4) model was run at the corresponding times and heights, outputting PM10 concentrations from all potential agricultural tilling operations. The calculated percentage contribution (modeled PM10 concentration/measured PM10 concentration) indicated that the near-surface (2-m height) proportion from the agricultural operations for five seasonal averages ranged from 0.7% to 1.5% on the west and east mesas and 1.3% for the valley site at Anthony. There were 71 hourly high values of contribution ratios ranging from 30 to 100% at the three sites, depending on the wind speed and direction.

No MeSH data available.


Related in: MedlinePlus

PM10 concentration comparison between observation and simulation at different heights from 11:13 MDT to 13:13 MDT on April 1, 2008 (MDT: Mountain Daylight Time).The concentration of the simulation at each height was calculated for the downwind plume area that intersected with the concentration of observation. Heights were from 200 to 550 m. The lables on the graph are heights following number of compared data points (e.g., 350 m, 14: The number of compared data points (number of corresponding observed data points to a compared simulation data point), was 6 at 450 m).
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pone.0138577.g007: PM10 concentration comparison between observation and simulation at different heights from 11:13 MDT to 13:13 MDT on April 1, 2008 (MDT: Mountain Daylight Time).The concentration of the simulation at each height was calculated for the downwind plume area that intersected with the concentration of observation. Heights were from 200 to 550 m. The lables on the graph are heights following number of compared data points (e.g., 350 m, 14: The number of compared data points (number of corresponding observed data points to a compared simulation data point), was 6 at 450 m).

Mentions: Using the experimental data, the model was verified (Fig 7) (please see details in [8]). Fig 7 shows the model simulation compared with the observation at different heights. The number of compared data points (number of corresponding measured data points to a compared simulation data point) ranged from 6 to 23. Generally, measured and simulated concentrations decrease with height. The linear regression shows that the simulated = 1.05×measured with R2 0.85. Therefore, the HYSPLIT 4.0 model is capable of simulating the regional PM10 dispersion from agricultural tilling operations, given the appropriate meteorological inputs and calibrated parameters as long as the source strength input (emission rate) is accurate.


Particulate Matter Contributions from Agricultural Tilling Operations in an Irrigated Desert Region.

Qi M, Lin K, Li X, Sammis TW, Miller DR, Wang J - PLoS ONE (2015)

PM10 concentration comparison between observation and simulation at different heights from 11:13 MDT to 13:13 MDT on April 1, 2008 (MDT: Mountain Daylight Time).The concentration of the simulation at each height was calculated for the downwind plume area that intersected with the concentration of observation. Heights were from 200 to 550 m. The lables on the graph are heights following number of compared data points (e.g., 350 m, 14: The number of compared data points (number of corresponding observed data points to a compared simulation data point), was 6 at 450 m).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4589322&req=5

pone.0138577.g007: PM10 concentration comparison between observation and simulation at different heights from 11:13 MDT to 13:13 MDT on April 1, 2008 (MDT: Mountain Daylight Time).The concentration of the simulation at each height was calculated for the downwind plume area that intersected with the concentration of observation. Heights were from 200 to 550 m. The lables on the graph are heights following number of compared data points (e.g., 350 m, 14: The number of compared data points (number of corresponding observed data points to a compared simulation data point), was 6 at 450 m).
Mentions: Using the experimental data, the model was verified (Fig 7) (please see details in [8]). Fig 7 shows the model simulation compared with the observation at different heights. The number of compared data points (number of corresponding measured data points to a compared simulation data point) ranged from 6 to 23. Generally, measured and simulated concentrations decrease with height. The linear regression shows that the simulated = 1.05×measured with R2 0.85. Therefore, the HYSPLIT 4.0 model is capable of simulating the regional PM10 dispersion from agricultural tilling operations, given the appropriate meteorological inputs and calibrated parameters as long as the source strength input (emission rate) is accurate.

Bottom Line: Hourly data from three air quality monitoring stations positioned at a 2-m height located on the west and east mesas of New Mexico's Mesilla Valley and in the valley at Anthony, NM were acquired from the New Mexico Air Quality Bureau.The study spanned the agricultural tilling season, March 1 to April 30, for the years 2008 to 2012.One- second spatial PM10 concentrations at 200 m above the valley floor were measured during a two-hour controlled field tilling operation on April 1, 2008.

View Article: PubMed Central - PubMed

Affiliation: School of Science, Wuhan University of Technology, Wuhan, Hubei, P. R. China.

ABSTRACT
Sources of regional particulate matter (PM), particularly agricultural operations, must be understood in order to manage the air quality in irrigated dry climates. Direct monitoring measurements alone are useful, but not sufficient, to estimate regional PM source concentrations. This paper combines modeling with ground (point) and airplane (spatial) measurement methods to estimate regional PM10 (PM diameter≤10 μm) contributions from agricultural operations. Hourly data from three air quality monitoring stations positioned at a 2-m height located on the west and east mesas of New Mexico's Mesilla Valley and in the valley at Anthony, NM were acquired from the New Mexico Air Quality Bureau. The study spanned the agricultural tilling season, March 1 to April 30, for the years 2008 to 2012. One- second spatial PM10 concentrations at 200 m above the valley floor were measured during a two-hour controlled field tilling operation on April 1, 2008. The HYSPLIT 4.0 (Hybrid Single-Particle Lagrangian Integrated Trajectory version 4) model was run at the corresponding times and heights, outputting PM10 concentrations from all potential agricultural tilling operations. The calculated percentage contribution (modeled PM10 concentration/measured PM10 concentration) indicated that the near-surface (2-m height) proportion from the agricultural operations for five seasonal averages ranged from 0.7% to 1.5% on the west and east mesas and 1.3% for the valley site at Anthony. There were 71 hourly high values of contribution ratios ranging from 30 to 100% at the three sites, depending on the wind speed and direction.

No MeSH data available.


Related in: MedlinePlus