Using CLM to model biogenic emissions How does uncertainty in land-cover dataset affect model emission estimates?Why do we care?Biogenic volatile organic compounds (BVOCs)Slide 4What’s “uncertainty in land-cover dataset?”Starting point: Two land-cover datasetsExperiment designUse Community Land Model (v. 3) to simulate BVOC emissions in TexasVary bare soil fractionIndirect effects of changing bare soil %ConclusionUsing CLM to model biogenic emissions How does uncertainty in land-cover dataset affect model emission estimates?Lindsey GuldenPhysical ClimatologyDecember 1, 2005Why do we care?Biogenic volatile organic compounds (BVOCs)Two BVOCs of primary concern: Isoprene (C5H8), monoterpenesWhat’s “uncertainty in land-cover dataset?”Starting point: Two land-cover datasetsExperiment designUse Community Land Model (v. 3) to simulate BVOC emissions in TexasOffline (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 fractionIndirect effects of changing bare soil %ConclusionChanging bare soil percentage in the land-surface dataset directly and indirectly affects modeled BVOC emissions.•Direct effects are much greater than indirectImplicationsLand-surface model estimation of BVOC emissions inherits all uncertainty associated with input land-cover datasets. Air-quality managers take
View Full Document
Unlocking...