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- W4239744654 abstract "Abstract. Polar stratospheric clouds (PSCs) of type 1a or 1a-enh containing high number densities of nitric acid trihydrate (NAT) particles, can act as mother clouds for extremely large NAT particles, termed NAT-rocks, provided the air below the clouds is supersaturated with respect to NAT. Individual NAT particles at the cloud base fall into undepleted gas phase and rapidly accelerate due to a positive feedback between their growth and sedimentation. The resulting reduction in number density is further enhanced by the strong HNO3 depletion within a thin layer below the mother cloud, which delays subsequent particles. This paper introduces the basic microphysical principles behind this mother cloud/NAT-rock mechanism, which produces 10-4 cm-3 NAT-rocks with radii around 10mm some kilometers below the mother cloud. The mechanism requires neither selective nucleation nor additional atmospheric dilution and works even for a monodisperse particle size distribution in the mother cloud." @default.
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- W4239744654 date "2002-01-14" @default.
- W4239744654 modified "2023-10-12" @default.
- W4239744654 title "NAT-rock formation by mother clouds: a microphysical model study" @default.
- W4239744654 doi "https://doi.org/10.5194/acpd-2-29-2002" @default.
- W4239744654 hasPublicationYear "2002" @default.
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