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GLASS “LOcal-COupled” Project: “LOCO”

GLASS “LOcal-COupled” Project: “LOCO”. Christa D. Peters-Lidard NASA’s Goddard Space Flight Center (GSFC) Hydrological Sciences Branch Greenbelt, MD USA. Motivation Strawman Proposal Case Study Sites. Outline.

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GLASS “LOcal-COupled” Project: “LOCO”

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  1. GLASS “LOcal-COupled” Project:“LOCO” Christa D. Peters-Lidard NASA’s Goddard Space Flight Center (GSFC) Hydrological Sciences Branch Greenbelt, MD USA GLASS Workshop 26-Aug-03

  2. Motivation Strawman Proposal Case Study Sites Outline GLASS Workshop 26-Aug-03

  3. Quantify surface/boundary layer feedbacks on surface fluxes and states (“Strength of the coupling”) Assess need for surface/boundary layer feedbacks in land surface data assimilation Examine propagation of sub-grid land surface heterogeneity Motivation GLASS Workshop 26-Aug-03

  4. BL Feedbacks Change Fluxes Uncoupled 600 Coupled 1-D PBL Sensible Heat Flux (Wm-2) From MOSAIC Model 0 1-3 AUG 1998, (58N,130W) GLASS Workshop 26-Aug-03

  5. LSMs Operate on Patches • Type A (Shuttleworth, 1988) patches generate Internal Boundary Layers which “Blend” above a certain height (e.g., Blyth et al., 1993) • Blending height a function of patch size L GLASS Workshop 26-Aug-03

  6. Workshop in De Bilt, Apr 2002. Summary by Bart van den Hurk et al. History GLASS Workshop 26-Aug-03

  7. Phase 1: Synthetic column –extract column boundary conditions from model Phase 2: Past Field Campaigns PILPS sites: Cabauw, FIFE, Boreas, others? GABLS sites: which? Others: SGP/ARM/IHOP, LBA, Wangara, others? Phase 3: Future Field Campaigns Upcoming Sites: HEAT (Houston, TX)-Urban; others? New Site(s): Design “local coupled testbed(s)” Strawman Proposal: LOCO GLASS Workshop 26-Aug-03

  8. Case Study 1: Southern Great Plains ’97 Experiment (SGP97) N GLASS Workshop 26-Aug-03

  9. SGP ’97 Tethersonde OpsPeters-Lidard and Davis, JHM, 2000 Launch Frequency Dates Vertical Spatial Resolution Sampling Interval Notes 0700-1100: < 1 hr 1230-1700: 1.5 hrs 6/18,19,22,25-29 7/2-6,14-16 ~2-5 m 10 s No wind >10m/s GLASS Workshop 26-Aug-03

  10. Morning Transition6/22/97 (Day 173) Potential Temperature (q) Specific Humidity (q) Tethersonde@1207 Tethersonde@1207 Radiosonde@1126 Tethersonde@1235 Radiosonde@1126 Tethersonde@1235 Moisture advection due to GP LLJ Stable surface layer profile GLASS Workshop 26-Aug-03

  11. Mixed Layer Analysis:Identifies “Non-Local” Effects Entrainment Parameter, A GLASS Workshop 26-Aug-03

  12. July 5 H Predictions; A=0.2 GLASS Workshop 26-Aug-03

  13. SGP ’97 H Predictions; A=0.2 GLASS Workshop 26-Aug-03

  14. SGP ’97 Flux Prediction Statistics H LE* *Advection of moisture (presumably by LLJ) RMS (W/m2) 52 321 Bias (W/m2) -15 -150 GLASS Workshop 26-Aug-03

  15. Case Study 2: Washita ’941-D Boundary Layer Model MM5/GSPBL/KF/TOPLATS GLASS Workshop 26-Aug-03

  16. 8/18: Wet Day, Strongly Forced SLAB OBS TOPLATS N GLASS Workshop 26-Aug-03

  17. 8/23: Dry Day: Weakly Forced SLAB OBS TOPLATS N GLASS Workshop 26-Aug-03

  18. IBL Can Affect Entire PBL TOPLATS MM5-SLAB 350 Sensible Heat Flux (Wm-2) GLASS Workshop 26-Aug-03

  19. Case Study 3: Ozone Exceedance Houston/Galveston, Texas, USA GLASS Workshop 26-Aug-03

  20. Case Study: August, 1998 GLASS Workshop 26-Aug-03

  21. Case Study: August, 1998 GLASS Workshop 26-Aug-03

  22. Case Study: August, 1998 GLASS Workshop 26-Aug-03

  23. Case Study: August, 1998 GLASS Workshop 26-Aug-03

  24. Cloud Initiation:Sea-breeze Front MM5/TOPLATS MM5/SLAB GLASS Workshop 26-Aug-03

  25. Conclusions • Non-local effects such as LLJ, clouds and sea-breeze fronts violate “local” assumptions, esp. humidity profiles • Disaggregation of fluxes/states to patch level requires parameterization of IBL/PBL • Coupled BL-LS feedbacks important GLASS Workshop 26-Aug-03

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