UCLA AOS145 Feb4

UCLA AOS145 Feb4 - dlnSdDp=0 In order to rest assured that...

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= dlnSdDp 0 In order to rest assured that activation will occur, S c < S env If incomplete dissociation, S c increases because not all of the ions are acting as solutes. “Lazy” Larger fraction of insolubles, reduces effective diameter, reduces S c (supersaturation is temperature dependent) Cloud Condensation Nuclei: Saturation of 5-7 are necessary for the formation of pure water droplets. As atmospheric S rarely reaches above 1.01 (?), “seed” particles are required for cloud formation Particles that can activate at a given supersaturation (indicate precise saturation) are defined as cloud condensation nuclei 1) Ccn represent the particles that can form cloud droplets under reasonable atmospheric supersaturations 2) Ccn concentrations always refer to a specific supersaturation, ccn (1%), ccn (0/5%), etc 3) For a given aerosol population ccn depends on both the size and composition of the particles Condensation nuclei (cn): particles which will become activated when S env = 4 (for intents and
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UCLA AOS145 Feb4 - dlnSdDp=0 In order to rest assured that...

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