The Use of Dynamic Grid Adaptation

1
The Use of Dynamic Grid Adaptation Adaptive
Satellite Observations in Numerical Weather
Prediction

• Zafer Boybeyi
• School of Computational Sciences
• George Mason University
• Fairfax, VA, 22030

2
Numerical Weather Prediction (NWP)

• Numerical Weather Prediction relies on
• Data assimilation (creating 3-D initial field)
• In-situ observations (e.g., surface balloon)
• Remotely-sensed observations (e.g.,
  satellite-based)
• Computational cost is high
• An alternative, Adaptive Satellite Data
  Assimilation
• Prognostic models
• Appropriate grid resolution to resolve the
  smallest scales of interest
• Computational cost is high
• An alternative, Dynamic Grid Adaptation
• High performance computing platform

3
GOES Satellite Data Assimilation
Adaptive Satellite Data Assimilation




4
High Resolution Simulation (5 km)Hurricane Floyd
Adaptive Satellite Data Assimilation

• Storm Tracks
• White Observations
• Red High Resolution Run

5
Coarse Resolution Simulation (75 km)Hurricane
Floyd
Adaptive Satellite Data Assimilation

• Storm Tracks
• White Observations
• Yellow Coarse Res
• Significant westward track deviation

6
GOES Satellite Data Assimilation
Adaptive Satellite Data Assimilation



Targeted 1000 GOES Soundings
Improved Track after Data Assimilation
Targeted 50 GOES Soundings
7
GOES Satellite Data Assimilation(Error Analysis
before and after data analysis)
Adaptive Satellite Data Assimilation



8
Dynamic Grid Adaptation
final
initial
comparison w/ exact solution
9
Dynamic Grid Adaptation
- 10 times speedup was achieved
10
Dynamic Grid Adaptation
Hurricane Ivan PredictionUsing Dynamic Grid
Adaptation
Grid resolution ranges from 100km down to 1km
dynamically adapting to the hurricane location
11
Hurricane Frances
Dynamic Grid Adaptation



12
California Wildfire Modeling

• Domain and Grid Configuration

• Several massive wildfires were raging across
  southern California over the weekend of October
  25, 2003.
• Whipped by the hot, dry Santa Ana winds that blow
  toward the coast from interior deserts.

13
California Wildfire Modeling

• 3-days simulation (10/24/2003 10/26/2003)

14
California Wildfire Modeling

• 3-days simulation (10/24/2003 10/26/2003)
• SW-NE cross section

Shows cross-section location