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Seasonal variability of ozone dry deposition under southern European climate conditions, in Portugal

Pio, CA; Feliciano, MS; Vermeulen, Alex LU and Sousa, EC (2000) In Atmospheric Environment 34(2). p.195-205
Abstract
Ozone dry deposition measurements were carried out during approximately one year over a flat grass field in Portugal. The results show prominent diurnal and seasonal patterns in deposition flux, dry deposition velocity and surface resistance, especially for the daytime period. Dry deposition velocities vary diurnally from a minimum of 0.1 cm s(-1) during the night to a maximum of 0.7-0.5 cm s(-1) during the day. The observed canopy resistance (R-c) varies from values higher than 500 s m(-1), at night, to a minimum of 200 s m(-1), around noon. Seasonal variation is characterised by daytime R-c values much larger in summer than in winter and spring, while nighttime values do not show any evident seasonal pattern. This behaviour can be... (More)
Ozone dry deposition measurements were carried out during approximately one year over a flat grass field in Portugal. The results show prominent diurnal and seasonal patterns in deposition flux, dry deposition velocity and surface resistance, especially for the daytime period. Dry deposition velocities vary diurnally from a minimum of 0.1 cm s(-1) during the night to a maximum of 0.7-0.5 cm s(-1) during the day. The observed canopy resistance (R-c) varies from values higher than 500 s m(-1), at night, to a minimum of 200 s m(-1), around noon. Seasonal variation is characterised by daytime R-c values much larger in summer than in winter and spring, while nighttime values do not show any evident seasonal pattern. This behaviour can be ascribed to the stomatal intake, which represents the most important controlling factor on ozone dry deposition. The Wesely parameterisation scheme of surface resistance predicts R-c diurnal cycles reasonably well. However, the observed canopy resistance seasonal cycle is completely different from Wesely predictions, since season parameters in Wesely's parameterisation were defined for a vegetation growing cycle different from that prevailing in our conditions. (C) 1999 Elsevier Science Ltd. All rights:reserved. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ozone dry deposition, surface resistance, stomatal resistance, diurnal, variation and parameterisation
in
Atmospheric Environment
volume
34
issue
2
pages
195 - 205
publisher
Elsevier
external identifiers
  • wos:000084663900004
  • scopus:0033991438
ISSN
1352-2310
DOI
10.1016/S1352-2310(99)00276-9
language
English
LU publication?
no
id
61a3d5cf-b26f-49bd-b9f6-d186e1ece896 (old id 4624093)
date added to LUP
2014-10-14 16:06:20
date last changed
2017-08-20 04:21:20
@article{61a3d5cf-b26f-49bd-b9f6-d186e1ece896,
  abstract     = {Ozone dry deposition measurements were carried out during approximately one year over a flat grass field in Portugal. The results show prominent diurnal and seasonal patterns in deposition flux, dry deposition velocity and surface resistance, especially for the daytime period. Dry deposition velocities vary diurnally from a minimum of 0.1 cm s(-1) during the night to a maximum of 0.7-0.5 cm s(-1) during the day. The observed canopy resistance (R-c) varies from values higher than 500 s m(-1), at night, to a minimum of 200 s m(-1), around noon. Seasonal variation is characterised by daytime R-c values much larger in summer than in winter and spring, while nighttime values do not show any evident seasonal pattern. This behaviour can be ascribed to the stomatal intake, which represents the most important controlling factor on ozone dry deposition. The Wesely parameterisation scheme of surface resistance predicts R-c diurnal cycles reasonably well. However, the observed canopy resistance seasonal cycle is completely different from Wesely predictions, since season parameters in Wesely's parameterisation were defined for a vegetation growing cycle different from that prevailing in our conditions. (C) 1999 Elsevier Science Ltd. All rights:reserved.},
  author       = {Pio, CA and Feliciano, MS and Vermeulen, Alex and Sousa, EC},
  issn         = {1352-2310},
  keyword      = {ozone dry deposition,surface resistance,stomatal resistance,diurnal,variation and parameterisation},
  language     = {eng},
  number       = {2},
  pages        = {195--205},
  publisher    = {Elsevier},
  series       = {Atmospheric Environment},
  title        = {Seasonal variability of ozone dry deposition under southern European climate conditions, in Portugal},
  url          = {http://dx.doi.org/10.1016/S1352-2310(99)00276-9},
  volume       = {34},
  year         = {2000},
}