1. IHOP_2002 AERI INSTRUMENT SUMMARY
IHOP Spring Science Workshop
University of Wisconsin – Madison SSEC/CIMSS
W. Feltz, R. Tanamachi, D. Posselt, T. Achtor and J. Mecikalski

2. IHOP AERI Retrieval Update
Retrieval Description
Preliminary Validation
Case Studies (Homestead)
12 June 2002 Water Vapor Oscillation
22 May 2002 Dryline
Summary

3. AERIplus Retrieval Description
First guess uses 20 km RUC NWP hourly analysis above 2 km
Surface moisture, ceilometer cloud base height, and PBL regression first guess using AERI radiances below 3 km combined as a priori input with RUC (Description in JAM paper Feltz et al. 2003)
Current temporal resolution ten minutes, vertical resolution improved in lowest kilometer from 100 m to 50 m (temporal resolution should be averaged to hourly continuous forcing data set) at five AERI DOE ARM SGP sites and Homestead site (just reprocessed)
Not available during precipitation, fog, or through/above clouds

4. Locations of Six AERI Systems

5. AERIplus Cross Section Examples

6. AERIplus and Radiosonde Comparisons
Hillsboro
3 June 0230 UTC
Vici
Lamont
Morris
Purcell

7. West – East AERI water vapor cross sections for IHOP

8. Homestead Site AERIplus vs Radiosonde Statistics

9. Vici, Oklahoma AERIplus vs Radiosonde Statistics

10. S-Pol/Homestead Site AERI Cases

11. 12 June 2002 Water Vapor Oscillation
The AERI instrument was deployed from May 13 - June 25, 2002 near Balko, Oklahoma (western Oklahoma panhandle) for the International H2O Program (IHOP) field campaign to measure water variability and how this relates to convective initiation and atmospheric boundary layer development. A rapid (30%) oscillation was retrieved from the AERI infrared radiances and this was also indicated from GPS retrieved integrated water vapor. This is the largest water variability in less than a 24 hour period retrieved from ten minute AERI radiances.
Total Precipitable Water
20 km RUC Analysis

12. 22 May 2002 Dryline Formation

13. AERIplus and Surface

14. Summary
All AERI data recently reprocessed for six sites (DOE ARM and Homestead, will update JOSS archive
>10 minute temporal resolution temperature and water vapor, preliminary analysis indicates the AERIplus retrievals provide
AERI Instrument Collection rate of 98% during IHOP, AERI retrievals were possible with ~60% of radiances, however this increases to 80% when providing a retrieval within a one hour time bin
Validation is ongoing and collaborations on several case studies are in progress
AERI References/Data Available at:

15. AERI Retrieval Collaborations
MM5 Data Assimilation (Couvreux and Weckwerth)
Stability Field Summaries (Roberts)
22 May 2002 Homestead Dryline (Demoz)
4 June and 20 June Bore Events (Koch and Flamant)
12 June 2002 – Water vapor oscillation and CI event (Mecikalski, Posselt, Smith)

16. References
Feltz, W. F., H. B. Howell, R. O. Knuteson, H. M. Woolf, and H E. Revercomb, 2003: Near Continuous Profiling of Temperature, Moisture, and Atmospheric Stability using the Atmospheric Emitted Radiance Interferometer (AERI). . J. Appl. Meteor., In Press.
Feltz, W. F. and J. R. Mecikalski, 2002: Monitoring High Temporal Resolution Convective Stability Indices Using the Ground-based Atmospheric Emitted Radiance Interferometer (AERI) During the 3 May 1999 Oklahoma/Kansas Tornado Outbreak. Wea. Forecasting, 17,
Turner, D. D., W. F. Feltz, and R. A. Ferrare, 2000: Continuous Water Profiles from Operational Ground-based Active and Passive Remote Sensors. Bull. Amer. Meteor. Soc., 81,
Feltz, W. F., W. L. Smith, R. O. Knuteson, H. E. Revercomb, H. M. Woolf, and H. B. Howell, 1998: Meteorological Applications of Temperature and Water Vapor Retrievals from the Ground-Based Atmospheric Emitted Radiance Interferometer (AERI). J. Appl. Meteor., 37,
Smith, W. L., W. F. Feltz, R. O. Knuteson, H. E. Revercomb, H. B. Howell, and H. M. Woolf, 1999: The Retrieval of Planetary Boundary Layer Structure using Ground-based infrared spectral radiance measurements. J. Atmos. Oceanic Technol., 16,