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Turbulent transfer of sulphur dioxide to a wheat crop
Author(s) -
Fowler D.,
Unsworth M. H.
Publication year - 1979
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49710544603
Subject(s) - dew , sink (geography) , environmental science , crop , agronomy , sulfur dioxide , relative humidity , canopy , dry weight , atmospheric sciences , botany , chemistry , biology , meteorology , ecology , geography , geology , cartography , condensation
Fluxes of sulphur dioxide to wheat were measured over two growing seasons. The deposition velocity, v g , depended primarily on affinities of surfaces for SO 2 and varied from less than 0.1 to about 1.5cms −1 . Stomata were an important sink, and diurnal changes in stomatal resistance accounted for most of the variation in v g when leaves were green and dry. When leaves were wet with dew, v g was generally large, irrespective of the physiological state of vegetation. A resistance analogue of transfer to the canopy agrees well with published work and is used to estimate seasonal uptake of SO 2 by the crop, showing that 30% of the sulphur content of the crop at harvest was probably supplied by absorption of SO 2 through stomata.