HIGH ICE WATER CONTENT FLIGHT PROJECT
Case description based on TWP-ICE field experiment:
- simulate week of active monsoon followed by suppressed conditions
(0Z 18 January - 0Z 3 February, 2006)
- sea surface temperature fixed at 29 C
- surface albedo fixed at 0.07
- ozone profile fixed based on sonde and OMI measurements
- initial condition and large-scale forcing profiles at 10-mb resolution
- winds above 500 m nudged to the forcing profiles with a 1-hour time scale
- large-scale moisture and potential temperature forcing implemented at full strength below 13 km and linearly decreased
to zero strength at 15 km
- moisture and potential temperature fields nudged to the forcing profiles with a 2-hour time scale
at full strength above 15 km and linearly decreasing to zero strength at 13 km, or else at full
strength above 1 km and linearly decreasing to zero strength at 0.5 km (nudging full domain)
Model configuration:
- large-eddy simulation dynamics code [Stevens and Bretherton, 1996]
- bulk microphysics [Grabowski, 1988] for entire period
- bin microphysics [Fridlind et al., 2007] restarts for shorter sub-periods
- fully periodic horizontal boundary conditions
- horizontal winds and temperature sponged to domain-mean values at domain top,
with a nudging coefficient increasing with sin-squared dependence from zero at 20 km
to (100 s)-1 at 24 km
- surface moisture, heat, and momentum fluxes treated with surface similarity theory
- domain size of 192x192x24 km (72x72x24 km for higher resolution case with bulk microphysics only)
- horizontal resolution of 1 km (125 m for higher resolution case with bulk microphysics only)
- vertical resolution of 100 m up to 1.5 km, increasing
linearly to 250 m at 3 km, constant at 250 m to 18 km, and decreasing
linearly above 18 km such that 96 grid points are provided between
the surface and the domain top at 24 km (62.5 m up to 1.5 km, linearly increasing to 125 m above 3 km
for higher resolution case with bulk microphyics only)
Initial simulations:
- Simulated cloud properties
- S-band radar response
- Reflectivity and mass statistics
