1. Investigation of Tracer Species in HIPPO I
Tom Loadholt
Eas 6410
April 26, 2012

2. Motivation
Homework Set 1 -- C2H2, CO transport and chemical aging vs dilution.
Evaluation of air transport using C2H6 and C3H8 -- Paper 2004, Wang, Y., Zeng, T.
Air mass age evaluation with C2H2, CO -- Paper 2007, Xiao, Y., Jacob, D., Turquety, S.

3. Tracer Ratios and Air Mass Age
Compare ratios of species with different lifetimes
C2H2 (2 Weeks) and CO (2 Months)
Linear mixing with background during transport = Straight-line on loglog with slope to background concentrations.
Chemical process alteration of ratios is a function of rate constants or lifetimes.

4. Project Plan Source Modeling Data Access EOL, CDIAC GEOS-Chem HIPPO
3D Global Transport
Emissions
Meteorology
Chemistry
Physics
Compare
Tracer Ratios for HIPPO with Earlier Studies
HIPPO
Haiper Pole-to-Pole Observations
Seasonally Constrained Simulation with Regional Data Extraction
Data Access
EOL, CDIAC

5. Data Processing GEOS-Chem Binary Data Convert netCDF IDL Tools Matlab
Graphics
Computations
HIPPO
DATA
Shell
Script
Graphics

6. HIPPO I Results
Reference Line
Slope = 2.8

7. HIPPO I Results
Reference Line
Slope = 2.8

8. HIPPO Continued
Chemical loss via OH

9. GEOS-Chem Results I

10. GEOS-Chem Results II
Extra week of aging

11. GEOS-Chem Results III

12. GEOS-Chem Results IV
Ref line with
slope 4
Ref line with
slope -3/4

13. Summary
HIPPO I Acetylene to Carbon Monoxide correlation follows Xiao, et. al
Comparison to chemical loss only rates suggest other factors such as emissions or mixing.
GEOS-Chem with default emissions appears to age into agreement with chemical loss.
Data set limited in both time and geography.