| PI Name: | James Hudson |
|---|---|
| Co-Investigators: | Doug Lowenthal, DRI |
| Proposal Title: | Indirect Aerosol Effect from Asia |
| Proposal Synopsis: | The two DRI CCN spectrometers will be used at the surface and on aircraft. One instrument will operate continuously at Kosan while the other obtains 3 dimensional profiles of CCN spectra. The measurements at Kosan will include MOUDI samplers to determine the size resolved composition of CCN. This will be compared with the size-resolved CCN spectra that will periodically be measured at the various MOUDI size cuts. There will also be volatility and size vs. particle critical supersaturation measurements at both locations. These are indirect indicators of particle composition. The CCN measurements at Kosan will be an integral aspect of the British Hill Cloud Experiment. This will also be linked to the cloud measurements by the Australian aircraft. Tests of the fundamental value of CCN measurements (applicability to real atmospheric clouds, especially in polluted environments) and of the principle of CCN spectrometry will be conducted, before, during, and after the field experiment. CCN measurements should provide a link between particle chemistry measurements and the ultimate or eventual effects on global climate by altering cloud albedo and stability. Comparisons will not only be made with cloud droplet concentrations and size distributions but also with drizzle to test both the primary and secondary indirect aerosol effects. We will provide an instrument to measure drizzle for the Hill Cloud Experiment. Comparisons with identical measurements in other parts of the world in both clean (e.g., ACE 1) and polluted (e.g., INDOEX) environments and clouds will provide perspective on the uniqueness and relative magnitude of the Asian contribution to the global indirect aerosol effect. |