IPMMI Proposed AGU Special Session
for
spring meeting 30 May - 3 June 2000
Title: Photolysis Frequency Measurements and Modeling
Description: Solar photolysis of various atmospheric molecules initiates many important processes that lead to the production of atmospheric oxidants. Photolysis rate coefficients, so-called j-values, are determined through several measurement techniques and estimated using radiative transfer calculations. We invite submittal of papers to this session addressing issues important to atmospheric photolysis research including field measurements, laboratory studies and modeling exercises. Particularly encouraged are papers that synthesize the results of these studies, to provide maximum value to the atmospheric chemistry community. As an example, in the summer of 1998, a ground-based comparison of a number of measurements and models of j(NO2) and j(O3®O(1D)) was conducted. The results of this experiment, called IPMMI (International Photolysis frequency Measurement and Modeling Intercomparison), revealed interesting relationships between the various methods, and lead to specific recommendations for j-value use in models and field campaigns.
Conveners: Christopher A. Cantrell, Richard E. Shetter, Sasha Madronich, and Jack G. Calvert
Contact: NCAR, 1850 Table Mesa Drive, Boulder, CO 80303; Tel: 303-497-1479; FAX: 303-497-1492; email: cantrell@ucar.edu.
The following topics (related to IPMMI) were recognized as potential papers for the AGU special session:
1. Overview of IPMMI
2. Actinic flux discussion
3. j(NO2) discussion
4. j(O1D) discussion
5. Summary and conclusions
6. NCAR SR
7. NCAR CA
8. FZJ SR
9. FZJ FR
10. ULI SR
11. ULI FR
12. UMD CA
13. IFU FR
14. Diode array spectroradiometers – dealing with stray light
15. Modeling atmospheric j-values
16. Use of Eppley radiometers to determine solar flux
17. Using spectral irradiance measurements to derive j-values
18. Sensitivity of j-values to input and modeled parameters
19. Role of photolysis processes in tropospheric chemistry
20. Effects of clouds and aerosols on j-values
21. Photolysis rate estimates for aircraft studies