GFDL Lunchtime Seminar

Wed, Nov 13, 2019, 12:00 pm to 1:00 pm

Exposure to ground-level ozone is harmful to human and plant health, especially on hot summer days when pollution from cars and power plants fuels the formation of ozone. The most extreme ozone pollution episodes are linked to heatwaves and droughts, which are increasing in frequency and intensity with rising temperatures and shifting rainfall patterns. Under drought stress, plants close their stomata to conserve water, consequently limiting the ozone uptake by vegetation (a component of dry deposition), leading to increased surface ozone concentrations. Such land-biosphere feedbacks are often overlooked in air quality projections, owing to a lack of process-based model formulations and observational constrains. In this talk, I will discuss recent advances and challenges in modeling land-biosphere feedbacks and implications for understanding air pollution extremes in a warming and drying climate. Specifically, our work highlights a previously under-appreciated "climate penalty" feedback mechanism - namely, substantial reductions of ozone uptake by water stressed vegetation - as a missing piece to the puzzle of why European ozone pollution episodes had not decreased as expected in recent decades, despite marked reductions in regional emissions of ozone precursors due to regulatory changes. Using both observations and models, we show as much as 70% reductions in ozone removal by vegetation during mega-droughts, such as the 2003 event in western Europe and the 2012 event in the eastern United States. Vegetation feedbacks exacerbate the sensitivity of ozone pollution extremes to increasing temperature in densely populated regions. Building upon these recent findings, I will discuss future research needs in observing, modeling, and predicting earth system feedbacks. Particularly, accurate assessment of land-biosphere feedbacks on air quality will benefit from improved representation of hydroclimate extremes in coupled atmosphere-ocean-land models.

Location: 
Smagorinsky Seminar Room 209
Speaker(s): 

GFDL Lunchtime Seminar

Wed, Feb 19, 2020, 12:00 pm to 1:00 pm
Location: Smagorinsky Seminar Room 209

Environmental Humanities Colloquium

Wed, Feb 19, 2020, 4:30 pm to 5:30 pm

Climate Futures Initiative (CFI) Seminar

Wed, Feb 19, 2020, 4:30 pm to 5:30 pm
Location: Lewis Library, Room 138

Environmental Geology & Geochemistry Seminar (EGGS) Lecture

Thu, Feb 20, 2020, 12:30 pm to 1:30 pm
Location: Guyot 220

Andlinger Highlight Seminar Series

Thu, Feb 20, 2020, 12:30 pm to 1:30 pm
Location: Maeder Hall, 92 Olden Street, Princeton, N.J. 08540

GEO Solid Earth Brown Bag Seminar

Fri, Feb 21, 2020, 12:00 pm to 1:00 pm
Location: Guyot 220

David Bradford Energy and Environmental Policy Seminar

Mon, Feb 24, 2020, 12:15 pm to 1:15 pm
Location: 300 Wallace Hall

GFDL Informal Seminar

Tue, Feb 25, 2020, 10:30 am to 11:30 am
Location: Smagorinsky Seminar Room 209

GEO Department Lecture

Tue, Feb 25, 2020, 12:30 pm to 1:30 pm
Location: Guyot 10

Environmental Geology & Geochemistry Seminar (EGGS) Lecture

Thu, Feb 27, 2020, 12:30 pm to 1:30 pm
Location: Guyot 220