CO2 Field during a Frontal Passage

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CO2 Field during a Frontal Passage

• Colorado State University
• Aaron Wang

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SiB-RAMS Coupled Model

• SiB and RAMS have been coupled, and we are
  testing it.
• A coupled model enables the atmosphere to see
  CO2 flux from the surface right at each time step.

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Data Preparation

• meteorology data ETA 40 km 3-hour at grid 212
• soil map IGBP 10 km
• vegetation map AVHRR satellite 1 km from U. of
  Maryland
• NDVI climatology NDVI 1 km monthly for now,
  SPOT NDVI 1 km 10-day in the future
• sea surface temperature climatology SST 1
  degree monthly
• topography USGS 1 km
• soil moisture homogeneous for now, offline SiB
  output later

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Model Setups

• horizontal resolution 40 km, 20 km, and finer
• vertical resolution from 60 m to 1200 m
• time step 50 s for the 1st grid or smaller
• others Kuo convection scheme, Harrington
  radiation scheme, Mellor-Yamada diffusion scheme,
  microphysics of medium complexity,
  Klemp/Wilhelmson boundary condition, boundary
  nudging of medium strength, etc.
• SiB or LEAF is our land surface parameterization.
  Fossil fuel emission turns on/off.

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Some Initial Results
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CO2 field with fossil-fuel emission on and SiB off
8/14/2001 00Z
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8/14/2001 06Z
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8/14/2001 12Z
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8/14/2001 18Z
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8/15/2001 00Z
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8/15/2001 06Z
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8/15/2001 12Z
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8/15/2001 18Z
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8/16/2001 00Z
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CO2 field with SiB on
8/14/2001 00Z
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8/14/2001 06Z
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8/14/2001 12Z
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8/14/2001 18Z
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8/15/2001 00Z
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8/15/2001 06Z
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8/15/2001 12Z
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8/15/2001 18Z
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8/16/2001 00Z
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Future Work

• Implement heterogeneous soil moisture
  initialization
• Implement SPOT NDVI input
• New morphology table and respiration factor map
• Compare with observation
• Compare results with the runs having prescribed
  CO2 flux

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Acknowledge
This is a team work. All my colleagues make the
research possible.