Lindsey Gulden Physical Climatology December 1, 2005

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Presentation transcript:

Lindsey Gulden Physical Climatology December 1, 2005 Using CLM to model biogenic emissions How does uncertainty in land-cover dataset affect model emission estimates? Lindsey Gulden Physical Climatology December 1, 2005

Why do we care?

Biogenic volatile organic compounds (BVOCs) Two BVOCs of primary concern: Isoprene (C5H8), monoterpenes

What’s “uncertainty in land-cover dataset?”

Starting point: Two land-cover datasets

Experiment design

Use Community Land Model (v. 3) to simulate BVOC emissions in Texas Offline (means that land-surface model gets meteorological input from data files, not from an atmosphere model) Resolution: 0.1° x 0.1° (fine resolution!) Simulation period: January 1, 1993–January 1, 1999; analyzed last 4 years’ data **Used region-specific BVOC emissions capacities derived from species-based vegetation dataset (Wiedinmyer et al., 2001)

Vary bare soil fraction

Indirect effects of changing bare soil %

Conclusion Implications Changing bare soil percentage in the land-surface dataset directly and indirectly affects modeled BVOC emissions. Direct effects are much greater than indirect Implications Land-surface model estimation of BVOC emissions inherits all uncertainty associated with input land-cover datasets. Air-quality managers take note.