Wet deposition

Wet deposition describes the process by which gases and particles are scavenged from the atmosphere (in cloud or below cloud) by raindrops and delivered to the ground. The best way to estimate wet deposition is to collect all rainfall in suitable samplers, measure the contaminant concentrations, and calculate seasonal wet fluxes of chemicals. Thus wet fluxes are estimated as seasonal deposition at each site equipped with a wet-only integrating collector. The collector has a stainless steel surface with a surface area of 0.21 m2.

Fluxwet,total (ng m-2 yr-1) = VWM (ng m-3) x P (m yr-1) (2)

where VMW is the volume weighted concentration (ng m-3), and P is the Precipitation Intensity (myr-1). Precipitation intensity typically is 1.05 to 1.15 myr-1 in New Jersey.

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