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<p>The familiar multiple resistance representation of processes contributing to the dry deposition of airborne contaminants to a plant canopy is revised to correct an error introduced in its initial development. The revision continues to consider three major components of the deposition process, approximated as (1) the resistance (<i>R</i><sub><i>a</i></sub>) to transfer through the air from some specified height above the canopy to the canopy itself, (2) a separate resistance (<i>R</i><sub><i>b</i></sub>) associated with transfer through the canopy airspace and a third resistance (<i>R</i><sub><i>c</i></sub>) describing the spatial repercussions of the various contributing mechanisms that determine the capture of trace chemicals by surface elements (e.g., leaves). In the initial simulations, results of pipe-flow studies (involving the Schmidt number, <i>Sc</i>) were incorrectly associated with the <i>R</i><sub><i>b</i></sub> term. Many decades later, it is now apparent that the relevant considerations should be associated with <i>R</i><sub><i>c</i></sub>, and not with <i>R</i><sub><i>b</i></sub>. A brief outline of the history of the original development is given, together with a detailed discussion of the revision now presented. The consequences of the error are such that deposition velocities for dense gases and small particles will have been underestimated. Small errors are likely for the cases of trace gases with diffusivities not greatly different from air.</p>

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Re-thinking the Dry Deposition Multiple Resistance Framework

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Bruce B. Hicks

摘要

The familiar multiple resistance representation of processes contributing to the dry deposition of airborne contaminants to a plant canopy is revised to correct an error introduced in its initial development. The revision continues to consider three major components of the deposition process, approximated as (1) the resistance (Ra) to transfer through the air from some specified height above the canopy to the canopy itself, (2) a separate resistance (Rb) associated with transfer through the canopy airspace and a third resistance (Rc) describing the spatial repercussions of the various contributing mechanisms that determine the capture of trace chemicals by surface elements (e.g., leaves). In the initial simulations, results of pipe-flow studies (involving the Schmidt number, Sc) were incorrectly associated with the Rb term. Many decades later, it is now apparent that the relevant considerations should be associated with Rc, and not with Rb. A brief outline of the history of the original development is given, together with a detailed discussion of the revision now presented. The consequences of the error are such that deposition velocities for dense gases and small particles will have been underestimated. Small errors are likely for the cases of trace gases with diffusivities not greatly different from air.