Summary
Pollution of cloud and precipitation water by airborne particles occuring primarily as a result of collision aerosol scavenging processes can within the drop size spectrum considerably be changed due to stochastic coagulation of polluted drops. The effect of mutaal drop coagulation shifts the size spectrum to larger drops. This is accompanied by a spectral redistribution of the drop water as well as the captured particle content. Describing particle scavenging and redistribution by drop coagulation in terms of a microdynamical model, we find how the degree of drop pollution varies with different cloud physical reference states.
Zusammenfassung
Verschmutzung von Wolken- und Niederschlagswasser durch luftgetragene Teilchen, die primär durch Auswaschen von Aerosol zustandekommt, kann innerhalb des Tropfengrößenspektrums aufgrund stochastischer Koagulation der verschmutzten Tropfen erheblich verändert werden. Der Effekt durch gegenseitiges Koagulieren (der Tröpfchen) verlagert das Größenspektrum zu größeren Tropfen. Dies führt zu einer spektralen Neuverteilung des Tropfenwassers sowie des eingeschlossenen Teilchengehalts. Das Auswaschen von Aerosol und die Neuverteilung durch Koagulation werden mit einem mikrodynamischen Modell beschrieben, mit dem der Verschmutzungsgrad der Tröpfchen und seine Veränderung bei verschiedenen wolkenphysikalischen Voraussetzungen berechnet wird.
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Beheng, K.D., Herbert, F. Mathematical studies on the aerosol concentration in drops changing due to particle scavenging and redistribution by coagulation. Meteorl. Atmos. Phys. 35, 212–219 (1986). https://doi.org/10.1007/BF01041813
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DOI: https://doi.org/10.1007/BF01041813