Grantee Research Project Results
2007 Progress Report: Effects of Global Change on the Atmospheric Mercury Burden and Mercury Sequestration Through Changes in Ecosystem Carbon Pools
EPA Grant Number: R833378Title: Effects of Global Change on the Atmospheric Mercury Burden and Mercury Sequestration Through Changes in Ecosystem Carbon Pools
Investigators: Obrist, Daniel , Johnson, Dale W. , Lindberg, Steve , Luo, Yiqi
Institution: Desert Research Institute , University of Oklahoma , University of Nevada - Reno
Current Institution: Desert Research Institute , University of Nevada - Reno , University of Oklahoma
EPA Project Officer: Chung, Serena
Project Period: May 1, 2007 through April 30, 2012
Project Period Covered by this Report: February 15, 2007 through February 14,2008
Project Amount: $899,091
RFA: Consequences of Global Change For Air Quality (2006) RFA Text | Recipients Lists
Research Category: Climate Change , Air
Objective:
Approach:
This proposed study includes a systematic determination of Hg in vegetation and soil C pools in terrestrial ecosystems, field and laboratory experimental studies, and modeling components. We aim to (1) collect the first systematic database on Hg pools and fluxes associated with terrestrial C pools by assessing C:Hg ratios of major ecosystem compartments in nine terrestrial ecosystems across the U.S. and combining these data with existing detailed data on plant and soil C pools and turnover rates; (2) perform controlled laboratory and field studies to clarify the fate of sequestered Hg pools during C mineralization (i.e., organic matter decomposition), specifically to what degree Hg is emitted back to the atmosphere; (3) statistically compare Hg pools and fluxes among climatically different sites to establish a hierarchy of climatic factors and drivers which control Hg pools and fluxes associated with terrestrial C; and (4) integrate acquired Hg data into an existing global change C model to scale up data to coterminous U.S. states and to enable prediction of how changes in C dynamics may affect the atmospheric Hg burden during the next 100 years.
Progress Summary:
Expected Results:
Systematic quantification of Hg levels in major ecosystems will provide the first comprehensive database on Hg pools, plant Hg uptake, sequestration, and Hg turnover associated with terrestrial C pools in the U.S. Fate processes of Hg sequestered in C pools are fundamental to prediction of how anticipated C pool changes in the future will feedback on the future atmospheric Hg burden. Integration of Hg data into an existing global change C model will enable for prediction on how various global change scenarios will affect C-related Hg cycling. Our results will support formulation of strategies by land managers, policy makers, and stakeholders to mitigate atmospheric Hg and stabilize Hg sequestered in terrestrial C pools.
Future Activities:
Journal Articles on this Report : 1 Displayed | Download in RIS Format
Other project views: | All 64 publications | 21 publications in selected types | All 21 journal articles |
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Type | Citation | ||
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Zhang H, Lindberg SE, Kuiken T. Mysterious diel cycles of mercury emission from soils held in the dark at constant temperature. Atmospheric Environment 2008;42(21):5424-5433. |
R833378 (2007) R833378 (2009) R833378 (2010) R833378 (Final) |
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Supplemental Keywords:
, RFA, Scientific Discipline, Air, climate change, Air Pollution Effects, Environmental MonitoringRelevant Websites:
Progress and Final Reports:
Original AbstractThe perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.