Concentrations of carbon monoxide and methane at two heights above a grass field and their deposition onto the field

S. Yonemura, A. Miyata, M. Yokozawa

Research output: Contribution to journalConference article

5 Citations (Scopus)

Abstract

To investigate whether wind is a significant driving force in the diffusion of CO and CH4 from the atmosphere into soil, we measured the concentrations of these two gases at two heights above a temperate grass field in Japan and estimated their deposition velocities using micrometeorological techniques. The concentrations were inversely correlated with wind speed, indicating that the local concentrations were influenced by ground sources. The CO and CH4 concentrations at 0.33 m were usually lower than those at 1.3 m. Although nocturnal data are suspected to be non-stationary, by selecting several periods when the changes of the concentrations were small but larger than analytical precision, we obtained a CO velocity of 2.9 and 3.9×10-2 cm s-1, agreeing with a CO deposition velocity, 3.4×10-2 cm s-1, obtained by applying a method using CO2 as a tracer. The CH4 influx obtained by the method using CO2 as a tracer was 13 ng m-2 s-1. The ranges of the CO deposition velocity and CH4 influx were similar to those obtained in previous studies in grassfields and in a nearby arable field using a closed-chamber technique. This shows that light winds do not greatly accelerate CO and CH4 uptake by soil.

Original languageEnglish
Pages (from-to)5007-5014
Number of pages8
JournalAtmospheric Environment
Volume34
Issue number29-30
DOIs
Publication statusPublished - 2000 Jan 1
Event6th Scientific Conference of the International Global Atmospheric Chemistry Project (IGAC) - Bologna, Italy
Duration: 1999 Sep 131999 Sep 17

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Keywords

  • Concentration gradient
  • Deposition velocity
  • Micrometeorological technique
  • Soil uptake
  • Winter

ASJC Scopus subject areas

  • Environmental Science(all)
  • Atmospheric Science

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