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Effects of Ozone-Vegetation Coupling...

Sadeke, Maiheliyaer.

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Effects of Ozone-Vegetation Coupling on Surface Ozone Air Quality.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effects of Ozone-Vegetation Coupling on Surface Ozone Air Quality./
作者:	Sadeke, Maiheliyaer.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	149 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-08, Section: B.
Contained By:	Dissertations Abstracts International80-08B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13837882
ISBN:	9780438851801

Effects of Ozone-Vegetation Coupling on Surface Ozone Air Quality.
Sadeke, Maiheliyaer.

Effects of Ozone-Vegetation Coupling on Surface Ozone Air Quality. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 149 p.

Source: Dissertations Abstracts International, Volume: 80-08, Section: B.

Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2018.

This item must not be sold to any third party vendors.

Tropospheric ozone is one of the most hazardous air pollutants as it harms both human health and plant productivity. Foliage uptake of ozone via dry deposition damages photosynthesis and causes stomatal closure. These foliage changes could lead to a cascade of biogeochemical and biogeophysical effects that not only modulate the carbon cycle, regional hydrometeorology and climate, but also cause feedbacks onto surface ozone concentration itself. Here we implement a semi-empirical parameterization of ozone damage on vegetation in the Community Earth System Model to enable full, dynamic online ozone-vegetation coupling, so that for the first time ecosystem structure and ozone concentration can coevolve in fully coupled land-atmosphere simulations. We examine the impacts of ozone-vegetation coupling under present-day and various future emissions using the projection following Intergovernmental Panel on Climate Change (IPCC) Representative Concentration Pathway business-as-usual (RCP8.5) scenario. With ozone-vegetation coupling, present-day surface ozone is simulated to be higher by up to 4-6 ppbv over Europe, North America and China. Reduced dry deposition velocity following ozone damage contributes to majority of those increases, constituting a significant positive biogeochemical feedback on ozone air quality. Enhanced biogenic isoprene emission is found to contribute to most of the remaining increases, and is driven mainly by higher vegetation temperature that results from lower transpiration rate. The reduction in dry deposition is mostly associated with reduced stomatal conductance and decreased leaf area following ozone damage. To investigate the ozone-vegetation feedbacks as anthropogenic emissions change from the present day to the future, we first modify the modeling framework to improve the representation of vegetation physiology. With the revised model, we find that the magnitudes and spatial pattern of ozone feedbacks following the emission projections from the present day to the future according to the RCP8.5 scenario are broadly consistent with the present-day ozone feedbacks. The higher ozone concentrations (by up to 4-6 ppbv) due to positive ozone-vegetation feedbacks are associated with around 5500 (1900-9300), 2200 (750-3800) and 600 (200-1000) more premature mortalities in China, Europe and the US, respectively. In the northern midlatitudes, especially in the high-NOx regions such as the eastern US, western Europe and eastern China, decreases in dry deposition velocity caused by decreases in both stomatal conductance and leaf area, together with higher isoprene emission due to higher vegetation temperature, lead to the higher simulated ozone concentrations. In the tropics with mostly low-NOx conditions, decreases in dry deposition velocity and lower isoprene emission (which leads to less ozone destruction) due to the significant reduction in leaf area dominate the positive feedbacks on ozone. Under present-day conditions, compared to the case without ozone-vegetation coupling, total reductions in global gross primary productivity and transpiration in the fully coupled simulations are 14.7% and 8.9%, respectively, which could significantly modulate the global carbon cycle and regional hydrometeorology. These results point to the significance of ozone-vegetation interactions in air quality simulations, and highlight the need to consider two-way ozone-vegetation coupling in earth system models to derive a more complete understanding and yield more reliable, coordinated future predictions of ecosystem health and air quality.

ISBN: 9780438851801Subjects--Topical Terms:

545717
Biogeochemistry.
Subjects--Index Terms:

Ozone air quality

Effects of Ozone-Vegetation Coupling on Surface Ozone Air Quality.
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520 $a Tropospheric ozone is one of the most hazardous air pollutants as it harms both human health and plant productivity. Foliage uptake of ozone via dry deposition damages photosynthesis and causes stomatal closure. These foliage changes could lead to a cascade of biogeochemical and biogeophysical effects that not only modulate the carbon cycle, regional hydrometeorology and climate, but also cause feedbacks onto surface ozone concentration itself. Here we implement a semi-empirical parameterization of ozone damage on vegetation in the Community Earth System Model to enable full, dynamic online ozone-vegetation coupling, so that for the first time ecosystem structure and ozone concentration can coevolve in fully coupled land-atmosphere simulations. We examine the impacts of ozone-vegetation coupling under present-day and various future emissions using the projection following Intergovernmental Panel on Climate Change (IPCC) Representative Concentration Pathway business-as-usual (RCP8.5) scenario. With ozone-vegetation coupling, present-day surface ozone is simulated to be higher by up to 4-6 ppbv over Europe, North America and China. Reduced dry deposition velocity following ozone damage contributes to majority of those increases, constituting a significant positive biogeochemical feedback on ozone air quality. Enhanced biogenic isoprene emission is found to contribute to most of the remaining increases, and is driven mainly by higher vegetation temperature that results from lower transpiration rate. The reduction in dry deposition is mostly associated with reduced stomatal conductance and decreased leaf area following ozone damage. To investigate the ozone-vegetation feedbacks as anthropogenic emissions change from the present day to the future, we first modify the modeling framework to improve the representation of vegetation physiology. With the revised model, we find that the magnitudes and spatial pattern of ozone feedbacks following the emission projections from the present day to the future according to the RCP8.5 scenario are broadly consistent with the present-day ozone feedbacks. The higher ozone concentrations (by up to 4-6 ppbv) due to positive ozone-vegetation feedbacks are associated with around 5500 (1900-9300), 2200 (750-3800) and 600 (200-1000) more premature mortalities in China, Europe and the US, respectively. In the northern midlatitudes, especially in the high-NOx regions such as the eastern US, western Europe and eastern China, decreases in dry deposition velocity caused by decreases in both stomatal conductance and leaf area, together with higher isoprene emission due to higher vegetation temperature, lead to the higher simulated ozone concentrations. In the tropics with mostly low-NOx conditions, decreases in dry deposition velocity and lower isoprene emission (which leads to less ozone destruction) due to the significant reduction in leaf area dominate the positive feedbacks on ozone. Under present-day conditions, compared to the case without ozone-vegetation coupling, total reductions in global gross primary productivity and transpiration in the fully coupled simulations are 14.7% and 8.9%, respectively, which could significantly modulate the global carbon cycle and regional hydrometeorology. These results point to the significance of ozone-vegetation interactions in air quality simulations, and highlight the need to consider two-way ozone-vegetation coupling in earth system models to derive a more complete understanding and yield more reliable, coordinated future predictions of ecosystem health and air quality.
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653 $a Ozone-vegetation coupling
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793 $a English
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