Preprints
https://doi.org/10.5194/gmd-2021-41
https://doi.org/10.5194/gmd-2021-41

Submitted as: development and technical paper 05 Mar 2021

Submitted as: development and technical paper | 05 Mar 2021

Review status: this preprint is currently under review for the journal GMD.

Extension of a gaseous dry deposition algorithm to oxidized volatile organic compounds and hydrogen cyanide for application in chemistry transport models

Zhiyong Wu1,2, Leiming Zhang1, John T. Walker3, Paul A. Makar1, Judith A. Perlinger4, and Xuemei Wang5 Zhiyong Wu et al.
  • 1Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, ON, M3H 5T4, Canada
  • 2ORISE Fellow at US Environmental Protection Agency, National Risk Management Research Laboratory, Research Triangle Park, NC, 27711, USA
  • 3US Environmental Protection Agency, National Risk Management Research Laboratory, Research Triangle Park, NC, 27711, USA
  • 4Civil & Environmental Engineering Department, Michigan Technological University, Houghton, MI, 49931, USA
  • 5Institute for Environmental and Climate Research, Jinan University, Guangzhou, 510632, China

Abstract. With increasing complexity of air quality models, additional chemical species have been included in model simulations for which dry deposition processes need to be parameterized. For this purpose, the gaseous dry deposition scheme of Zhang et al. (2003) is extended to include 12 oxidized volatile organic compounds (oVOCs) and hydrogen cyanide (HCN) based on their physicochemical properties, namely the effective Henry's law constants and oxidizing capacities. Modeled dry deposition velocity (Vd) values are compared against field flux measurements over a mixed forest in the southeastern U.S. during June 2013. The model captures the basic features of the diel cycles of the observed Vd. Modeled Vd values are comparable to the measurements for most of the oVOCs at night. However, modeled Vd values are mostly around 1 cm s−1 during daytime, which is much smaller than the observed daytime maxima of 2–5 cm s−1. Analysis of the individual resistance terms/uptake pathways suggests that flux divergence due to fast atmospheric chemical reactions near the canopy was likely the main cause of the large model-measurement discrepancies during daytime. The extended dry deposition scheme likely provides conservative Vd values for many oVOCs. While higher Vd values and bi-directional fluxes can be simulated by coupling key atmospheric chemical processes into the dry deposition scheme, we suggest that more experimental evidence of high oVOC Vd values at additional sites is required to confirm the broader applicability of the high values studied here. The underlying processes leading to high measured oVOC Vd values require further investigation.

Zhiyong Wu et al.

Status: open (until 30 Apr 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on gmd-2021-41', Juan Antonio Añel, 03 Apr 2021 reply
    • AC1: 'Reply on CEC1', Leiming Zhang, 13 Apr 2021 reply
    • AC2: 'Reply on CEC1', Leiming Zhang, 13 Apr 2021 reply
      • CEC2: 'Reply on AC2', Juan Antonio Añel, 16 Apr 2021 reply
        • AC3: 'Reply on CEC2', Leiming Zhang, 16 Apr 2021 reply

Zhiyong Wu et al.

Zhiyong Wu et al.

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Short summary
A community dry deposition algorithm for modeling gaseous dry deposition process in chemistry transport models was extended to include oxidized volatile organic compounds based on their physicochemical properties and was then evaluated using field flux measurements over a mixed forest. This study provides a useful tool that is needed in chemistry transport models with increasing complexity for simulating an important atmospheric process.