TWP-ICE/ACTIVE MONSOON CASE STUDY

Reflectivity profiles based on measurements (white symbols) versus sample case study simulations (colored lines):



Comments:

• Mean and maximum profiles are calculated for nine time ranges. The first three are longer time ranges: (1) all times following an initial 36 hours for model spin-up, (2) six days of monsoon, and (3) six days of suppressed conditions. The second six are 24-hour periods: three sequential monsoon events of increasing intensity, followed by cirrus evolution after the third event.
• S-band vertically pointing profiler (2835-MHz) data are supplied by Christopher Williams. Plots show range of values from 1-minute frequency data in cloud mode (no noise removal).
• All measurement data have been downloaded from the DOE ARM data archive (www.arm.gov) and use in publications is subject to the policies described there. Any errors in plotting or representation shown here should be blamed on Ann Fridlind.
• Model results are derived from fields reported at 3-hour frequency and 1-km resolution over a domain size of about 37,000 km². Full range of values shown at each level for each time period.

Preliminary summary:

• Over the shorter time periods A, B, and C, the S-band observes strong updrafts directly over the instrument only during event C (stratiform areas are observed during events A and B). Statistics for updraft regions are necessarily poor for a vertically-pointing instrument over a two-week period. Nonetheless, valuable information is obtained from the combination of doppler velocity and reflectivity in large stratiform areas (other analyses will be undertaken to instigate such data).