New Updraft Retrievals for TWP-ICE and Comparison with Dual-frequency Profiler Measurements

Scott Collis Argonne National Laboratory
Alain Protat Australian Bureau of Meterology
Peter May Bureau of Meteorology
Christopher Williams University of Colorado
Kao-Shen Chung McGill University - Atmospheric and Oceanic Sciences

Category: Atmospheric State & Surface

Working Group: Cloud-Aerosol-Precipitation Interaction

As the use of cloud-resolving models (CRMs) to verify parameterization schemes in global climate models increases, so does the importance of validating the dynamical and microphysical schemes within the CRMs. The Tropical Warm Pool-International Cloud Experiment (TWP-ICE) produced a data set for the initialization and forcing of numerical simulation of deep convective storms as well as an extensive set of measurements. Previously reported radar-based retrievals of updraft intensities from TWP-ICE indicated low (<1m/s) vertical velocities within intense updrafts at cloud base. An enhanced retrieval technique, which includes a correction for sub-radar convergence, has been implemented, and initial retrievals over the wet monsoon period of TWP-ICE return more realistic cloud base vertical velocities, ~2m/s within the intense convective cores. To provide some validation of the technique, a comparison between updrafts retrieved from the radar-based radial velocity measurements and those retrieved from a dual-frequency (920/50MHz) profiler system was performed, showing good agreement. Percentile curves of retrieved vertical velocity show weaker updrafts than those produced in CRM simulations for the same period of TWP-ICE, a difference that is the subject of future investigation.

This poster will be displayed at ASR Science Team Meeting.