Title:
Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications.

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dc.contributor.advisor Wang, Yuhang
dc.contributor.author Shim, Changsub en_US
dc.contributor.committeeMember Cunnold Derek
dc.contributor.committeeMember Guillas Serge
dc.contributor.committeeMember Nenes Athanasios
dc.contributor.committeeMember Weber Rodney
dc.contributor.department Earth and Atmospheric Sciences en_US
dc.date.accessioned 2006-09-01T19:30:20Z
dc.date.available 2006-09-01T19:30:20Z
dc.date.issued 2006-06-26 en_US
dc.description.abstract Biogenic isoprene plays an important role in tropospheric chemistry. We use HCHO column measurements by the Global Ozone Monitoring Experiment (GOME) to constrain isoprene emissions. Using the global Goddrad Earth Observing SystemChemistry (GEOS-Chem) as the forward model, a Bayesian inversion of GOME HCHO observations from September 1996 to August 1997 is conducted. Column contributions to HCHO from 12 sources including 10 terrestrial ecosystem groups, biomass burning, and industry are considered and inverted for 8 geographical regions globally. The a posteriori solution reduces the model biases for all regions, and estimates the annual global isoprene emissions of 566 Tg C yr-1, ~50% larger than the a priori estimate. Compared to the Global Emissions Inventory Activity (GEIA) inventory (~500 Tg C yr-1), the a posteriori isoprene emissions are generally higher at mid latitudes and lower in the tropics. This increase of global isoprene emissions significantly affects tropospheric chemistry, decreasing the global mean OH concentration by 10.8% to 0.95106 molecules/cm3. The atmospheric lifetime of CH3CCl3 increases from 5.2 to 5.7 years. Positive matrix factorization (PMF), an advanced method for source apportionment, is applied to TRAnsport of Chemical Evolution over the Pacific (TRACE-P) measurements and it is found that cyanogenesis in plants over Asia is likely an important emission process for CH3COCH3 and HCN. This approach also is applied to estimate source contributions to the tropospheric ozone (O3) with Tropospheric Ozone Production about the Spring Equinox (TOPSE) and TRACE-P measurements. The corresponding GEOS-Chem simulations are applied to the same factor-projected space in order to evaluate the model simulations. Intercontinental transport of pollutants is most responsible for increasing trend of springtime O3, while stratospheric influence is the largest contributions to troposperic O3 variability at northern middle and high latitudes. On the other hand, the overall tropospheric contributions to O3 variability are more important at northern low latitudes by long-range transport, biomass burning, and industry/urban emissions. In general, the simulated O3 variabilities are comparable with those of observations. However, the model underestimates the trends of and the contributions to O3 variability by long-range transport of O3 and its precursors at northern middle and high latitudes. en_US
dc.description.degree Ph.D. en_US
dc.format.extent 3390936 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/11530
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Inverse en_US
dc.subject Isoprene
dc.subject VOC
dc.subject Ozone
dc.subject Troposphere
dc.subject Atmosphere
dc.subject PMF
dc.subject Source contributions
dc.subject Remote sensing
dc.subject.lcsh Volatile organic compounds Environmental aspects Measurement en_US
dc.subject.lcsh Tropospheric chemistry en_US
dc.subject.lcsh Ozone en_US
dc.subject.lcsh Isoprene en_US
dc.subject.lcsh Atmosphere Remote sensing en_US
dc.title Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications. en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Wang, Yuhang
local.contributor.corporatename School of Earth and Atmospheric Sciences
local.contributor.corporatename College of Sciences
relation.isAdvisorOfPublication 978cb158-0230-4051-b51e-c904074e42bc
relation.isOrgUnitOfPublication b3e45057-a6e8-4c24-aaaa-fb00c911603e
relation.isOrgUnitOfPublication 85042be6-2d68-4e07-b384-e1f908fae48a
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