Interactions of the Terrestrial Biosphere With Climate and Atmospheric Chemistry
Naik, Vaishali
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https://hdl.handle.net/2142/85960
Description
Title
Interactions of the Terrestrial Biosphere With Climate and Atmospheric Chemistry
Author(s)
Naik, Vaishali
Issue Date
2003
Doctoral Committee Chair(s)
Wuebbles, Donald J.
Department of Study
Atmospheric Sciences
Discipline
Atmospheric Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biogeochemistry
Language
eng
Abstract
Isoprenoids are the most dominant class of biogenic volatile organic compounds (BVOCs) and have been shown to significantly impact global tropospheric chemistry and composition, climate and the global carbon cycle. In the second part of this dissertation, the sensitivity of biogenic isoprene and monoterpene emissions to combined and isolated fluctuations in observed climate and atmospheric carbon dioxide (CO2) concentration during the period 1971--1990 is assessed using IBIS. Model results indicate that the combined fluctuations in climate and atmospheric CO2 during 1971 to 1990 caused significant interannual and seasonal variability in global biogenic isoprenoid fluxes partly related to the El Nino Southern Oscillation, with an increasing trend attributed to the CO2 fertilization effect. Finally, a coupled biospheric-atmospheric chemistry model is developed and used to study the impact of biogenic isoprenoid emissions on global tropospheric chemistry. Results indicate that the coupled model is able to better explain the observed tropospheric concentrations of O3, CO and PAN and is, thus, a powerful tool to study the feedbacks between biospheric processes and atmospheric chemistry.
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