In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 95, No. D6 ( 1990-05-20), p. 7501-7514
Abstract:
Experiments were conducted to examine the chemical properties of dew (and guttation) that affect the dry deposition of SO 2 to prairie grasses of tall stature and mixed broadleaf plants of short stature. For 2–3 hours after sunrise, liquid samples were extracted directly from the upper of the plant canopies and from surrogate surfaces, concurrently with selected atmospheric observations. Chemical analyses showed that aqueous concentrations of S(IV), SO 4 2‐ , and several other ions in the leaf wetness were often high compared to values typically found in rain, while NH 4 + was not very abundant. Guttation produced substantial amounts of liquid, which mainly contributed Cl − to the leaf wetness. The dry deposition of S(IV) to leaf wetness was not always apparently limited by aqueous oxidation by O 3 , especially when aerodynamic resistances limited the maximum potential deposition velocity to less than 0.5 cm/s at a height of 8 m. A more effective oxidant than atmospheric O 3 or NO 2 could have been present and could have lessened the inferred substantial contributions of particle deposition to leaf wetness SO 4 2‐ . Foliar uptake of NO 3 ‐ and SO 4 2‐ was significant after sunrise. The p H of the leaf wetness in the broadleaf vegetation seemed to have a lower limit of about 5.3, possibly because of neutralization by substances leached from leaves, while the p H of the grasses reached values as low as 4.5 when the amount of leaf wetness was small. The potassium ion concentration in leaf wetness appeared to be an effective marker for leaf leaching.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/JD095iD06p07501
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1990
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