Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 GLASS “LOcal-COupled” Project: “LOCO” Christa D. Peters-Lidard NASA’s Goddard Space Flight.

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Presentation transcript:

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

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Outline Motivation Strawman Proposal Case Study Sites

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Motivation 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

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 BL Feedbacks Change Fluxes Sensible Heat Flux (Wm -2 ) From MOSAIC Model Uncoupled Coupled 1-D PBL 1-3 AUG 1998, (58N,130W)

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 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

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 History Workshop in De Bilt, Apr –Summary by Bart van den Hurk et al.

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Strawman Proposal: LOCO 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)”

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 N Case Study 1: Southern Great Plains ’97 Experiment (SGP97)

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 SGP ’97 Tethersonde Ops Peters-Lidard and Davis, JHM, : < 1 hr : 1.5 hrs 6/18,19,22, /2-6,14-16 ~2-5 m 10 s No wind >10m/s Launch Frequency Dates Vertical Spatial Resolution Sampling Interval Notes

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Potential Temperature (  ) Specific Humidity (q) Morning Transition 6/22/97 (Day 173) Stable surface layer profile Moisture advection due to GP LLJ

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Mixed Layer Analysis: Identifies “Non-Local” Effects Entrainment Parameter, A

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 July 5 H Predictions; A=0.2

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 SGP ’97 H Predictions; A=0.2

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 RMS (W/m 2 ) Bias (W/m 2 ) H LE* *Advection of moisture (presumably by LLJ) SGP ’97 Flux Prediction Statistics

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Case Study 2: Washita ’94 1-D Boundary Layer Model MM5/GSPBL/KF/TOPLATS

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 N 8/18: Wet Day, Strongly Forced SLABTOPLATSOBS

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 N SLAB 8/23: Dry Day: Weakly Forced TOPLATSOBS

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 IBL Can Affect Entire PBL Sensible Heat Flux (Wm -2 ) TOPLATS MM5-SLAB 350

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Case Study 3: Ozone Exceedance Houston/Galveston, Texas, USA

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Case Study: August, 1998

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Case Study: August, 1998

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Case Study: August, 1998

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Case Study: August, 1998

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 Cloud Initiation:Sea-breeze Front MM5/TOPLATSMM5/SLAB

Dr. Christa D. Peters-Lidard NASA/GSFC GLASS Workshop 26-Aug-03 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