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Robert Wood, University of Washington many contributors

VOCALS Regional Experiment (REx) Goals and Hypotheses. Robert Wood, University of Washington many contributors. THE VOCALS STRATEGY. VOCALS Regional Experiment (REx). Joint NOAA/NSF funded field program in October/November 2008. Additional support from ONR and DoE and international agencies

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Robert Wood, University of Washington many contributors

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  1. VOCALS Regional Experiment (REx)Goals and Hypotheses Robert Wood, University of Washington many contributors

  2. THE VOCALS STRATEGY

  3. VOCALS Regional Experiment (REx) • Joint NOAA/NSF funded field program in October/November 2008. Additional support from ONR and DoE and international agencies • REx will provide observations of poorly understood aspects of the SEP climate system • Main platforms: NSF C-130, NOAA Ronald H Brown, CIRPAS and Chilean Twin Otter, DoE G-1, FAAM BAe-146, NERC Dornier 228, Chilean land sites, Peruvian ship

  4. The Southeast Pacific Climate • Cold SSTs, coastal upwelling, subsidence • Cloud-topped MBLs • Influenced by and influential on remote climates (ENSO) • Unresolved issues in heat and nutrient budgets • Important links between clouds and aerosol • Poorly simulated by atmosphere-ocean GCMs

  5. Oct-Nov 2008 Aircraft: NSF C-130 CIRPAS Twin Otter DoE G-1 UK BAe-146 UK Dornier 228 Ships: NOAA Ronald H Brown Peru - Jose Olaya Land sites VOCALS-REx Platforms and Sampling

  6. The aircraft DoE ASP G-1 CIRPAS Twin Otter NSF C-130 Radar remote sensing, microphysics, turbulence Chemistry and aerosols, cloud microphysics, turbulence Aerosols, cloud microphysics, radiative measurements Chemistry and aerosols, cloud microphysics, turbulence, radar/lidar remote sensing Remote sensing and cloud imaging NERC Dornier 228 UK FAAM BAe-146

  7. Meteorological context SST (Reynolds)Surface winds (Quikscat)Sep-Nov climatology H

  8. MBL depth Open cell frequency

  9. Novel MBL depth estimates

  10. E-W transect 20oS

  11. VOCALS-REx Science Goals 1. AEROSOL-CLOUD-DRIZZLE GOALS Factors controlling the stratocumulus cloud thickness, cover, and optical properties over the SE Pacific 2. COUPLED OCEAN-ATMOSPHERE-LAND GOALS Physical and chemical links between the topography, coastal oceanic upwelling and the marine boundary layer

  12. VOCALS-REx Cross-Section Sampling Combined NOAA Ronald H Brown and NSF C-130Missions- direct evaluation of GCM lower tropospheric structure

  13. Open Cells Closed Cells Satellite Low albedo High albedo 100 km Ship Radar Strong drizzle Weak drizzle • Cloud albedo • strongly dependent upon open/closed cells • Strong precipitation associated with open cell structure • In-situ aircraft measurements of the mesoscale dynamics needed Sandra Yuter, NCSU

  14. Drizzle is important over the SEP

  15. Cloud Microphysical Variability Smelter locations MODIS Cloud Droplet Concentration (SON 2001-2004)

  16. 200 km

  17. POC formation Kim Comstock

  18. Aerosol, cloud, drizzle and POCs

  19. Flight-plan for C-130 POC-Drift missions

  20. Specific research for POST

  21. Determination of entrainment rate J. Climate (2004) reanalysis reanalysis satellite

  22. Questions • Use variety of methods to estimate cloud top height from satellite (MODIS/GOES, COSMIC, CALIPSO) • Compare with in-situ data (POST/VOCALS) • Assessment of entrainment rate (time/space variability) using Wood and Bretherton method applied to shorter (how short?) timescales

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