TY - JOUR
T1 - Measurements of ammonia flux to a spruce stand in Denmark
AU - Andersen, H.V.
AU - Hovmand, M.F.
AU - Hummelshøj, P.
AU - Jensen, N.O.
PY - 1993
Y1 - 1993
N2 - This work demonstrates the existence of a linear relation between the deposition velocity of ammonia and the friction velocity measured above a spruce stand in the western part of Denmark. In order to estimate the ammonia deposition velocity and flux to a Norway spruce forest, concentration gradients of ammonia and several meteorological parameters were measured in a meteorology tower during two periods, 1 week in spring and 1 week in late summer 1991. The estimated deposition velocities lie in the range −0.125 to 0.201 m s−1, with a mean of 0.026 m s−1. The deposition velocity and the flux were generally largest in the afternoon. On the basis of 24-h measurements of ammonia and routine meteorological measurements the relation between deposition velocity and friction velocity is extrapolated to an estimate of the average flux for the growing season May to September 1991. The estimate gave an average flux of 87 μg NH3 N m−2 h−1 (=0.02 μg NH3 N m−2 s−1). The average deposition velocity for the period was 0.045 m s−1.
AB - This work demonstrates the existence of a linear relation between the deposition velocity of ammonia and the friction velocity measured above a spruce stand in the western part of Denmark. In order to estimate the ammonia deposition velocity and flux to a Norway spruce forest, concentration gradients of ammonia and several meteorological parameters were measured in a meteorology tower during two periods, 1 week in spring and 1 week in late summer 1991. The estimated deposition velocities lie in the range −0.125 to 0.201 m s−1, with a mean of 0.026 m s−1. The deposition velocity and the flux were generally largest in the afternoon. On the basis of 24-h measurements of ammonia and routine meteorological measurements the relation between deposition velocity and friction velocity is extrapolated to an estimate of the average flux for the growing season May to September 1991. The estimate gave an average flux of 87 μg NH3 N m−2 h−1 (=0.02 μg NH3 N m−2 s−1). The average deposition velocity for the period was 0.045 m s−1.
KW - Energiproduktionens indvirkning på miljøet
U2 - 10.1016/0960-1686(93)90350-8
DO - 10.1016/0960-1686(93)90350-8
M3 - Journal article
SN - 1352-2310
VL - 27
SP - 189
EP - 202
JO - Atmospheric Environment
JF - Atmospheric Environment
IS - 2
ER -