Scientific Objectives and Required Facilities Socorro Medina, Robert Houze, and Stacy Brodzik TIMREX Planning Meeting, Tainan, Taiwan, 9 November 2007.

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Scientific Objectives and Required Facilities Socorro Medina, Robert Houze, and Stacy Brodzik TIMREX Planning Meeting, Tainan, Taiwan, 9 November 2007 Scientific Objectives –Investigate the vertical structure of precipitation over Taiwan’s terrain –Investigate the structure of the terrain-modified airflow Required Facilities: S-Pol and upper-air soundings Highly desired: Vertically-pointing precipitation radar

Results from previous field experiments (MAP and IMPROVE-2) to illustrate how S- Pol sectors of RHI scans were used to accomplish similar objectives

Medina et al. (2007) 3-hour mean S-Pol reflectivity ( UTC 28 Nov 2001 ) Cross-barrier distribution of time-averaged reflectivity as a function of height Distance from the radar (km) Pacific Coastal R. Valley Cascades Oregon Cascades

Cross-barrier distribution of S-Pol reflectivity aloft as a function of time - Maximum reflectivity (between 3-10 km) Medina et al. (2007) Western Oregon terrain Terrain elevation (km) Time (UTC)  dBZ Distance from radar (km) Nov 29 Nov Pacific Coastal R. Valley Cascades Oregon Cascades

PBL flow adjacent to the terrain and embedded convection (S-Pol data) Rotunno and Houze (2007) UTC 20 Sep 1999 mean Radial velocity (m/s)  Low-level flow rising over terrain Reflectivity (dBZ)  Maximum echo on top 1 st peak of terrain Particle Type (frequency of occurrence)  Stratiform background punctuated by graupel S-Pol NNW Distance from the radar (km) Dry snow Graupel Wet snow Alps

Evaluation of terrain-modified PBL flows simulated by numerical mesoscale models UTC 21 Oct 1999 mean Time-averaged observed radial velocity (m/s) (S-Pol) Time-averaged simulated radial velocity (m/s) (MESO-NH) S-Pol NW Distance from radar (km) Alps S-Pol NW Distance from radar (km) Alps

Vertically pointing radar data Reflectivity (dBZ)  Time Radial velocity (m/s) Houze and Medina (2005)

Other requirements Desk space for two people in the Operation Center (OPS) or for one person at the OPS and one person at the S-Pol site (depending on how much data can be transmitted from S-Pol to OPS) Internet access

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