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The individual effects of various meteorological parameters on PM2.5concentrations in the Eastern US are examined using the PMCAMx chemicaltransport model so that these effects and their relative magnitudes can bebetter understood. A suite of perturbations in temperature, wind speed,absolute humidity, mixing height, cloud cover, and precipitation are imposedindividually on base case conditions corresponding to periods in July 2001and January 2002 in order to determine the sensitivities of PM2.5concentrations and composition to these separate meteorological parameters.Temperature had a major effect on average PM2.5 in January (−170 ng m−3 K−1)due largely to the evaporation of ammonium nitrate andorganic aerosol at higher temperatures; increases in sulfate production withincreased temperature counteracted much of this decrease in July. Changes inmixing height also had major effects on PM2.5 concentrations: 73 ng m−3(100 m)−1 in January and 210 ng m−3 (100 m)−1 inJuly. Changes in wind speed (30 to 55 ng m−3 %−1) and absolutehumidity (15 to 20 ng m−3 %−1) also had appreciable effects onaverage PM2.5 concentrations. Precipitation changes had large impactson parts of the domain (a consequence of the base case meteorology), withsensitivities to changing area of precipitation in July up to 100 ng m−3 %−1.Perturbations in cloud cover had the smallest effectson average PM2.5 concentrations. The changes in PM2.5concentrations resulting from changing all eight meteorological parameterssimultaneously were approximately within 25% or so of the sum of thechanges to the eight individual perturbations. The sensitivities ofPM2.5 concentrations to changes in these meteorological parametersindicate that changes in climate could potentially have important impacts onPM2.5 concentrations

Sensitivity of PM&lt;sub&gt;2.5&lt;/sub&gt; to climate in the Eastern US: a modeling case study

Sensitivity of PM<sub>2.5</sub> to climate in the Eastern US: a modeling case study