Droplet Nuclei Measurements in VOCALS Intro and Preliminary Results

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Presentation transcript:

Droplet Nuclei Measurements in VOCALS Intro and Preliminary Results Counterflow Virtual Impactor (CVI) Collects droplets while rejecting interstitial aerosols & vapor Evaporates water so sample stream has non-volatile residual particles Change minimum size (cut size) of drops by changing counterflow rate

Instruments Used for VOCALS Behind the CVI 3 instruments were part of basic CVI system for cloud LWC, drop residual number and size (Toohey) 3 additional instruments to measure chemical characteristics of droplet residual particles (collaborations) Streaker SEM Aerosol Comp Impactor TEM Additional Instruments AMS C, S, N mass OPC Residual Nuclei Size TDL Liquid Water Content CN Counter Nuclei Number Basic System

R3 20 S Flight, Droplet Number Transition from Polluted to Clean Clouds and Back 75 West 85 West 75 West

CVI Residual Nuclei Size Distributions (uncorrected for CVI enhancement) 75 West 85 West 75 West Near shore, there are more residual nuclei (more drops) & bigger nuclei Offshore, nuclei are smaller: less pollution, more removal of aerosol through precipitation scavenging. (Not shown): Residual nuclei are larger than ambient aerosol: nucleation scavenging, in-cloud coalescence & chemical rxns.

Which Nuclei form Largest Drops Which Nuclei form Largest Drops? Important for understanding droplet activation and drizzle formation >7 m >11 m >14 m >16 m >8 µm filter change filter change Largest nuclei form largest drops through condensational growth Largest drops also may contain >one nuclei (coalescence)—clean clouds Composition is also important in droplet activation and indirect effects on clouds