Thesis ideas (updated October 2004):

1. Light scattering problems:

1. Discrepancy between OPC and backscattersonde - mid latitude comparison, e.g. Rosen,
2. Satellite e.g. Sage III - compare Laramie measurements to satellite data (Arctic/Laramie)
3. Comparison of OPC with nephelometer (lab work).
4. Tmatrix calculations to compare OPC measurements with independent optical scattering measurements.
5. Analyze source of discrepancy between Sfc/Vol(Ext(N(r))) vs Sfc/Vol(N(r)). Come up with method to empirically correct satellite data. (Jian Yongxiao)
6. Analyze SAGE III data in terms of Poole's method and OPC measurements to infer more information from SAGE III measurements. Define limitations of satellite data.

1. Engineering/Instrument characterization:

1. Investigate pressure dependent counting efficiency of: CN, OPC, New OPC, Small particle OPC.
2. Large particle counter help design, build, test in the lab, fly.
3. Laboratory test of twin angle counter. (Trude Eidhammer)

1. CN layer - McMurdo:

1. Compare measurements with models in the literature.
2. What is the altitude of the top of the CN layer in Antarctica, can we get through it with a summertime flight?

1. PSCs

1. Model growth of PSC particles (using Larsen's model) and compare with observations on a case by case basis - Arctic and Antarctic. Requires temperature history along back trajectory and some assumptions about nucleation.
2. Modeling temperature impact on PSC particles with OPC normal inlet and heated inlet (Trude Eidhammer, completed-paper submitted).

1. Ozone data - McMurdo

1. Compare with 3D CTM (Jennifer Mercer)
2. Climatology of 15 years ozone measurements
3. 1% vs 0.5% solution

1. Mid latitude aerosol - Laramie record

1. Apply optimal estimation analysis to retrieval of Laramie size distributions.

1. Aerosol laboratory

1. Transmission efficiency of aerodynamic focusing lens on AMS. (Peter Liu, paper in progress)