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In-cloud and below-cloud scavenging of Nitric acid vapor

Levine, S.Z. / Schwartz, S.E.

Abstract Scavenging coefficients, A, for the removal of HNO3 vapor from the atmosphere by both cloud and rain drops have been calculated for assumed models of drop-size distribution. For cumulus clouds a value of 0.2 s⁻¹ is estimated for A. Evaluation of rainfall washout coefficients gives values of A ranging from $1.3 × 10$ ⁻⁵ to $1.5 × 10$ ⁻³s⁻¹, depending upon the rainfall rate, upon the drop-size distribution function employed, and, strongly upon the lower limit of the raindrop size employed in the calculations. The concentration of soluble gas dissolved within a falling drop per unit fall distance is found to be a function of drop size, with the smaller drops accumulating the greater concentration. The long-term average rate of heterogeneous removal of HNO3 is estimated in the range $1–8 × 10$ ⁻⁶s⁻¹, representing comparable contributions from dry deposition and rainfall scavenging.

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In-cloud and below-cloud scavenging of Nitric acid vapor

Levine, S.Z. / Schwartz, S.E.

Abstract Scavenging coefficients, A, for the removal of HNO3 vapor from the atmosphere by both cloud and rain drops have been calculated for assumed models of drop-size distribution. For cumulus clouds a value of 0.2 s⁻¹ is estimated for A. Evaluation of rainfall washout coefficients gives values of A ranging from $1.3 × 10$ ⁻⁵ to $1.5 × 10$ ⁻³s⁻¹, depending upon the rainfall rate, upon the drop-size distribution function employed, and, strongly upon the lower limit of the raindrop size employed in the calculations. The concentration of soluble gas dissolved within a falling drop per unit fall distance is found to be a function of drop size, with the smaller drops accumulating the greater concentration. The long-term average rate of heterogeneous removal of HNO3 is estimated in the range $1–8 × 10$ ⁻⁶s⁻¹, representing comparable contributions from dry deposition and rainfall scavenging.

In-cloud and below-cloud scavenging of Nitric acid vapor

Levine, S.Z. / Schwartz, S.E.

Abstract Scavenging coefficients, A, for the removal of HNO3 vapor from the atmosphere by both cloud and rain drops have been calculated for assumed models of drop-size distribution. For cumulus clouds a value of 0.2 s⁻¹ is estimated for A. Evaluation of rainfall washout coefficients gives values of A ranging from $1.3 × 10$ ⁻⁵ to $1.5 × 10$ ⁻³s⁻¹, depending upon the rainfall rate, upon the drop-size distribution function employed, and, strongly upon the lower limit of the raindrop size employed in the calculations. The concentration of soluble gas dissolved within a falling drop per unit fall distance is found to be a function of drop size, with the smaller drops accumulating the greater concentration. The long-term average rate of heterogeneous removal of HNO3 is estimated in the range $1–8 × 10$ ⁻⁶s⁻¹, representing comparable contributions from dry deposition and rainfall scavenging.

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Title:

In-cloud and below-cloud scavenging of Nitric acid vapor

Contributors:

Levine, S.Z. (author) / Schwartz, S.E. (author)

Published in:

Atmospheric Environment ; 16 ; 1725-1734

Publication date:

1982-12-22

Size:

10 pages

ISSN:

DOI:

https://doi.org/10.1016/0004-6981(82)90266-9

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

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