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Titre du document / Document title

Ozone variation with height in a forest canopy: results from a passive sampling field campaign

Auteur(s) / Author(s)

KRZYZANOWSKI Judi (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Forest Resources Management, Forest Sciences Centre, The University of British Columbia, 2045-2424 Main Mall, Vancouver, BC V6T 1Z4, CANADA

Résumé / Abstract

Vertical ozone profiles were measured using a 10.5 m tower in a low (13 m) forest canopy in the Lower Fraser Valley, British Columbia, Canada. Ozone was measured cumulatively using passive samplers over five 2-week periods, at seven canopy heights. A strong power-law relationship was found between biweekly mean hourly ozone concentration and within-canopy height (r2 = 0.98-0.99), with a 31-47% reduction in ozone towards the forest floor. Using a Buckingham-Pi dimensional analysis the plots were normalised. Through similarity theory the equation y = 1.03 x 0.156 was derived for ozone concentration with canopy height; where y is normalised biweekly mean hourly ozone, x is height normalised by the height of the canopy, and b is a stability parameter that increases with increased stability. This study presents a unique method of measuring within-canopy ozone that is inexpensive, yields good results, and may be further developed for flux estimation.

Revue / Journal Title

Atmospheric environment    ISSN  1352-2310 

Source / Source

2004, vol. 38, no35, pp. 5957-5962 [6 page(s) (article)] (17 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1994) (Revue)

Mots-clés anglais / English Keywords

America

;

North America

;

Canada

;

British Columbia

;

Similarity theory

;

Power law

;

Passive detection

;

Sampler

;

Altitudinal distribution

;

Concentration distribution

;

Ozone

;

Air pollution

;

Canopy(vegetation)

;

Forests

;

Atmospheric boundary layer

;

Troposphere

;

Mots-clés français / French Keywords

Amérique

;

Amérique du Nord

;

Canada

;

Colombie britannique

;

Théorie similitude

;

Loi puissance

;

Détection passive

;

Echantillonneur

;

Répartition altitudinale

;

Distribution concentration

;

Ozone

;

Pollution air

;

Canopée

;

Forêt

;

Couche limite atmosphérique

;

Troposphère

;

Mots-clés espagnols / Spanish Keywords

America

;

America del norte

;

Canadá

;

Colombia Británica

;

Teoría similitud

;

Ley poder

;

Detección pasiva

;

Muestreador

;

Distribución de altitud

;

Distribución concentración

;

Ozono

;

Contaminación aire

;

Dosel

;

Bosque

;

Capa límite atmosférico

;

Troposfera

;

Mots-clés d'auteur / Author Keywords

Surface ozone

;

Forest canopy

;

Passive samplers

;

Vertical profiles

;

Similarity theory

;

Localisation / Location

INIST-CNRS, Cote INIST : 8940 B, 35400012238169.0070

Nº notice refdoc (ud4) : 16181150



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