Ana Barros 1 Andrew Wood 2 Francisco Munoz 1 Julio-Cesar Rodriguez 4 Dennis Lettenmaier 2 Stephen S. Burges 2 Ted Bohn 2 Mekonnen Gebremichael 1 Natalie.

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Presentation transcript:

Ana Barros 1 Andrew Wood 2 Francisco Munoz 1 Julio-Cesar Rodriguez 4 Dennis Lettenmaier 2 Stephen S. Burges 2 Ted Bohn 2 Mekonnen Gebremichael 1 Natalie Voisin 2 Christopher Watts 3 Monitoring the Diurnal Cycle of Land-Atmosphere Interactions During NAME/SMEX04 1 Duke University 2 University of Washington 3 University of Sonora 4 IMADES

Motivation Remote Sensing of Soil Moisture in Complex Terrain Leverage on NAME data collection Atmospheric Correction* Explain Spatial Variability of Observed Soil Moisture Understand Land-Atmosphere Interactions in Arid Regions

Exploratory Diagnostic Simulations with MM5 3km resolution) June

Surface Latent Heat

NW-SE

Diurnal Cycle of Rainfall Landform and organization of convective activity Vegetation and the role of evapotranspiration Diurnal Cycle of Boundary Layer Winds Relationship between organization of mountain-valley circulations and the diurnal cycle of rainfall Diurnal Cycle of Atmospheric Instability Convective instability and the diurnal cycle of rainfall Objectives

Vegetation Response to Rainfall

east valley slopes Spatial Variability Of the Diurnal Cycle of Rainfall

SW- late afternoon East- early afternoon NNW- early evening NCAR/ATD TAOS system

a) Daytime b) Evening/Nighttime NAM diurnal cycle in the San Miguel Moist anabatic upslope breeze Terrain induced asymmetry (Up) Valley wind Return Flow (Downvalley) Mountain wind Lateral Katabatic drainage breeze Valley convergence Southward moving storms Synoptic winds Return flow Surface Flow Local winds

S E N W [m/s] July 29, 2004 Low-level (downvalley) mountain wind

Mid-level Return Flow Anabatic Valley Winds

stable residual layer mixed layer surface layer Growth of the Mixed layer Stable No Rain Conditions

east valley slopes Spatial Variability Of the Diurnal Cycle of Rainfall

Synoptic controls Local Surface controls

a) Daytime b) Evening/Nighttime NAM diurnal cycle in the San Miguel Moist anabatic upslope breeze Terrain induced asymmetry (Up) Valley wind Return Flow (Downvalley) Mountain wind Lateral Katabatic drainage breeze Valley convergence Southward moving storms Synoptic winds Return flow Surface Flow Local winds

* dry * wet dry S Question: What is the Contribution of Evapotranspiration to Daytime Rainfall?

Discussion “Exploratory” Field Experiment Raingauge Network Soundings (radiosondes, profilers, rainy conditions) Lightning High-maintenance Tower(s) Unique evidence of strong space-time structuring of rainfall and low-level circulations in a semi-arid region of complex terrain Insolation Patterns (surface energy budget) Landform and topography Land-cover “Definitive” Field Experiment

Acknowledgments

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