Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications.
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 GO...
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Georgia Institute of Technology
2006
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ftgeorgiatech:oai:smartech.gatech.edu:1853/11530 2023-05-15T18:39:15+02:00 Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications. Shim, Changsub Wang, Yuhang Earth and Atmospheric Sciences Cunnold Derek Guillas Serge Nenes Athanasios Weber Rodney 2006-06-26 3390936 bytes application/pdf http://hdl.handle.net/1853/11530 en_US eng Georgia Institute of Technology http://hdl.handle.net/1853/11530 Inverse Isoprene VOC Ozone Troposphere Atmosphere PMF Source contributions Remote sensing Volatile organic compounds Environmental aspects Measurement Tropospheric chemistry Atmosphere Remote sensing Text Dissertation 2006 ftgeorgiatech 2023-02-13T18:45:50Z 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 ... Doctoral or Postdoctoral Thesis Tropospheric Ozone Production About the Spring Equinox Georgia Institute of Technology: SMARTech - Scholarly Materials and Research at Georgia Tech Pacific |
institution |
Open Polar |
collection |
Georgia Institute of Technology: SMARTech - Scholarly Materials and Research at Georgia Tech |
op_collection_id |
ftgeorgiatech |
language |
English |
topic |
Inverse Isoprene VOC Ozone Troposphere Atmosphere PMF Source contributions Remote sensing Volatile organic compounds Environmental aspects Measurement Tropospheric chemistry Atmosphere Remote sensing |
spellingShingle |
Inverse Isoprene VOC Ozone Troposphere Atmosphere PMF Source contributions Remote sensing Volatile organic compounds Environmental aspects Measurement Tropospheric chemistry Atmosphere Remote sensing Shim, Changsub Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications. |
topic_facet |
Inverse Isoprene VOC Ozone Troposphere Atmosphere PMF Source contributions Remote sensing Volatile organic compounds Environmental aspects Measurement Tropospheric chemistry Atmosphere Remote sensing |
description |
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 ... |
author2 |
Wang, Yuhang Earth and Atmospheric Sciences Cunnold Derek Guillas Serge Nenes Athanasios Weber Rodney |
format |
Doctoral or Postdoctoral Thesis |
author |
Shim, Changsub |
author_facet |
Shim, Changsub |
author_sort |
Shim, Changsub |
title |
Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications. |
title_short |
Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications. |
title_full |
Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications. |
title_fullStr |
Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications. |
title_full_unstemmed |
Constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications. |
title_sort |
constraining global biogenic emissions and exploring source contributions to tropospheric ozone: modeling applications. |
publisher |
Georgia Institute of Technology |
publishDate |
2006 |
url |
http://hdl.handle.net/1853/11530 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Tropospheric Ozone Production About the Spring Equinox |
genre_facet |
Tropospheric Ozone Production About the Spring Equinox |
op_relation |
http://hdl.handle.net/1853/11530 |
_version_ |
1766227941045305344 |