In-situ Measurements of Aerosol-Cloud-Precipitation Interactions During the 2011 E-PEACE Campaign: Case Studies of Clouds Perturbed by Ship Emissions
Abstract
The Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) Twin Otter probed aerosol-cloud-precipitation interactions during the 2011 Eastern-Pacific Emitted Aerosol Cloud Experiment (E-PEACE) off the central coast of California. During the project, ship exhaust in a major north-south shipping lane used by large cargo and tanker ships off the coast of Monterey, CA was probed in order to study its effect on the marine stratocumulus commonly found in the summer months. During the course of a single experiment, fresh ship exhaust was sampled near the ship and followed downwind for approximately 20 miles before ascending to sample the plume at multiple heights in cloud. The chemical and physical properties of the ship exhaust was characterized below cloud by an Aerosol Mass Spectrometer (AMS), a Cloud Condensation Nuclei Counter (CCNC), multiple Condensation Particle Counters (CPCs), parallel Differential Mobility Analyzers (DMAs), a Passive Cavity Aerosol Spectrometer Probe, a Single Particle Soot Photometer (SP2), and a Photoacoustic Soot Spectrometer (PASS3). An upward-facing Doppler cloud radar (3 mm wavelength) captured the vertical microphysical and velocity structure of the clouds. The cloud droplet number and size distributions were characterized within the cloud with a Cloud, Aerosol, and Precipitation Spectrometer, a Forward Scattering Spectrometer Probe, and a Phase Doppler Interferometer, as were the cloud droplet nuclei chemistry and physical properties by several instruments (AMS, DMA, PASS3, SP2, CCNC, and CPC) sampling behind a Counterflow Virtual Impactor inlet. This presentation provides an overview of our findings.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.A11B0078M
- Keywords:
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- 0305 ATMOSPHERIC COMPOSITION AND STRUCTURE / Aerosols and particles;
- 0320 ATMOSPHERIC COMPOSITION AND STRUCTURE / Cloud physics and chemistry;
- 3311 ATMOSPHERIC PROCESSES / Clouds and aerosols