Environmental Engineering Reference
In-Depth Information
Fig. 3.
Same as Fig. 1 but for launch time at 17:36 UTC on August 2, 2006, at Huntsville, AL
Fig. 4.
Same as Fig. 1 but for launch time at 19:18 UTC on August 2, 2006, at Beltsville, MD
5. Questions and Answers
Dr. Dazhong Yin, CA Environmental Protection Agency:
Standard CMAQ
uses a sigma vertical co-ordinate. NAM uses a sigma-pressure hybrid vertical
co-ordinate. Did you make any changes in CMAQ to use Kz directly from NAM?
Answer:
Yes, the vertical grid structure of CMAQ for the NAQFC changed. It
adapted to the implementation of vertical grid structure change in June 2006.
Now the CMAQ model within the NAQFC has 22 sigma-lower and pressure-
upper vertical grid structure. Since NMM has 61 levels, CMAQ picks 22 from
that with denser spacing in the lower levels. The lowest 14 levels straddle a
height of 2.5 km.
