Ozone uptake by an evergreen forest canopy: temporal variation and possible mechanisms
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Ozone uptake by an evergreen forest canopy: temporal variation and possible mechanisms. / Mikkelsen, T N; Ro-Poulsen, H; Pilegaard, K; Hovmand, M F; Jensen, N O; Christensen, C S; Hummelshoej, P.
I: Environmental Pollution, Bind 109, Nr. 3, 2000, s. 423-429.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Ozone uptake by an evergreen forest canopy: temporal variation and possible mechanisms
AU - Mikkelsen, T N
AU - Ro-Poulsen, H
AU - Pilegaard, K
AU - Hovmand, M F
AU - Jensen, N O
AU - Christensen, C S
AU - Hummelshoej, P
N1 - Keywords: Ozone flux; Ozone deposition; Terpenes; Volatile organic compounds; Gradient and eddy correlation method
PY - 2000
Y1 - 2000
N2 - Patterns of ozone concentration ([O(3)]), O(3) deposition velocity (v(d)) and O(3) flux (F(c)) over an evergreen forest canopy are shown in relation to measuring method, physiological activity of the trees, and time of year. The gradient and eddy correlation methods were compared and showed similar diel v(d) patterns. Daytime F(c) was correlated with CO(2) and water vapour fluxes, while no correlation between [O(3)] in the range 10-70 ppb (nl l(-1)) and F(c) was seen in this study. F(c) was primarily driven by stomatal conductance, reactions with surfaces, particles and gases, and not by [O(3)]. On a monthly basis, [O(3)] was always highest in the afternoon while v(d) was typically higher in the morning, resulting in an equal F(c) over the day. Night-time F(c) was more than half of the daytime O(3) flux. The data reveal the importance of emissions of nitric oxide and terpenes as O(3) removal factors in evergreen forest dominated by Norway spruce.
AB - Patterns of ozone concentration ([O(3)]), O(3) deposition velocity (v(d)) and O(3) flux (F(c)) over an evergreen forest canopy are shown in relation to measuring method, physiological activity of the trees, and time of year. The gradient and eddy correlation methods were compared and showed similar diel v(d) patterns. Daytime F(c) was correlated with CO(2) and water vapour fluxes, while no correlation between [O(3)] in the range 10-70 ppb (nl l(-1)) and F(c) was seen in this study. F(c) was primarily driven by stomatal conductance, reactions with surfaces, particles and gases, and not by [O(3)]. On a monthly basis, [O(3)] was always highest in the afternoon while v(d) was typically higher in the morning, resulting in an equal F(c) over the day. Night-time F(c) was more than half of the daytime O(3) flux. The data reveal the importance of emissions of nitric oxide and terpenes as O(3) removal factors in evergreen forest dominated by Norway spruce.
U2 - 10.1016/S0269-7491(00)00045-2
DO - 10.1016/S0269-7491(00)00045-2
M3 - Journal article
C2 - 15092875
VL - 109
SP - 423
EP - 429
JO - Environmental Pollution
JF - Environmental Pollution
SN - 0269-7491
IS - 3
ER -
ID: 182239