Experimentally derived estimates of nitric acid dry deposition velocity and viscous sub-layer resistance at a conifer forest

Pryor SC, Klemm O

Forschungsartikel (Zeitschrift)

Zusammenfassung

Daytime dry deposition of nitric acid to a conifer forest with a LAI of 5.3 was measured using the relaxed eddy accumulation technique. The observations indicate a mean friction velocity of 0.45 ms(-1) and a mean dry deposition velocity (nu(d)) of 7.5 cm s(-1), with approximately equal aerodynamic (r(a)) and non-aerodynamic resistances (r(b) + r(c)). Mean r(a) is 10 s m(-1), while mean r(b) + r(c) (derived from the difference between the observed nu(d) and a value derived based solely on r(a)) is 13.2 s m(-1). Assuming the surface resistance (r(c)) is zero, the viscous sub-layer resistance (r(b)) from a number of models capture the mean observationally derived value to within +/-40%, but the models underestimate the variability inherent in the measurements. This discrepancy between the modeled and observed sample-to-sample variability of rb does not appear to be accounted for by leaf wetness, stomatal opening or an additional dependence on friction velocity. (C) 2004 Elsevier Ltd. All rights reserved.

Details zur Publikation

FachzeitschriftAtmospheric Environment
Jahrgang / Bandnr. / Volume38
Ausgabe / Heftnr. / Issue18
Seitenbereich2769-2777
StatusVeröffentlicht
Veröffentlichungsjahr2004 (30.06.2004)
Sprache, in der die Publikation verfasst istEnglisch
DOI: 10.1016/j.atmosenv.2004.02.038
StichwörterHNO3 dry deposition flux relaxed eddy accumulation forest pine pinus-strobus deciduous forest air-pollutants wet conditions north-america vapor canopy hno3 nitrogen fluxes

Autor*innen der Universität Münster

Klemm, Otto
Professur für Klimatologie (Prof. Klemm)