Research Projects

Project at a Glance

Title: Improving regional biogenic VOC emission estimates using an airborne PRTMS eddy flux measurement system

Principal Investigator / Author(s): Allen Goldstein

Contractor: UC Berkeley

Contract Number: 09-339


Research Program Area: Atmospheric Processes

Topic Areas: Field Studies, Natural (Biogenic) Sources


Abstract:

Current air quality simulations include the role of isoprene and monoterpene chemistry in tropospheric ozone and aerosol production but the magnitude and spatial-temporal distributions of BVOC emissions in California is a complex issue which would benefit from additional data to constrain emissions estimates. Current biogenic VOC emission models predict significant emissions of isoprene from oak woodlands of the Coast Range and the Sierra Nevada mountains, yet there have been few measurements of BVOC fluxes from California landscapes at a larger spatial scale than individual leaves and branches. To create a regional scale BVOC emissions database for validating emissions estimates, during the summer 2011, the principal investigators deployed an airborne Proton Transfer Reaction Mass Spectrometer and Eddy Covariance (PTRMS EC) system over key Californian ecosystems. This project found that airborne basal and model land cover emission factors compare favorably. Eucalyptus and oak woodlands were confirmed as critical isoprene emission areas in the state. In Sierra Nevada oak savanna, agreement between the model and measured flux data is excellent. Generally, average individual ecoregion measured and flux data agree quite well. Isoprene modeling emissions simulations are effective in general and where they differ from airborne data, the issue is likely a combination of discrepancies in the underlying land cover maps, meteorological parameters, or LAI data. This project provides important confirmation of the quality of the biogenic inventory used in ARBís SIP modeling.


 

For questions regarding research reports, contact: Heather Choi at (916) 322-3893

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