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CLOUD CONDENSATION NUCLEI MEASUREMENTS DURING THE SENEX 2013 CAMPAIGN: OBSERVATIONS, ANALYSIS AND IMPACTS
Impact/Purpose:
We propose to integrate instrumentation and carry out measurements of high-resolution Cloud Condensation Nuclei (CCN) “spectra” (i.e., concentration of CCN as a function of water vapor supersaturation) onboard the NOAA WB-P3 during SENEX-2013. CCN measurements will be carried out using a Droplet Measurement Technologies Continuous-Flow Streamwise Thermal Gradient Chamber. Together with concurrent measurements of aerosol composition (AMS spectra, PILS water-soluble organic composition), aerosol size distribution and subsaturated hygroscopic water uptake, the complex relationship between size, composition, mixing state and droplet activation kinetics will be resolved with unprecedented resolution for aerosol in the Southeast United States (SE US).
Description:
This proposal targets the EPA-STAR Anthropogenic Influences on Organic Aerosol Formation and Regional Climate Implications, EPA-G2012-STAR-D1 question 3: “How are the climatically relevant properties of biogenic secondary organic aerosols (either optical properties or cloud interactions) impacted by anthropogenic emissions?”. The focus of this proposal is on the development and analysis of new data sets obtained from field measurements. We plan to do so by participating in the NOAA SENEX-2013 campaign (aboard the WB-P3 aircraft) and using the data to quantify the cloud & climate properties of carbonaceous aerosol.