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): 

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Location: GFDL 317

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Mon, Nov 18, 2019, 4:00 pm to 5:00 pm
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GFDL Lunchtime Seminar

Wed, Nov 20, 2019, 12:00 pm to 1:00 pm
Location: Smagorinsky Seminar Room 209

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Location: Mathey College PDR Room

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Thu, Nov 21, 2019, 12:30 pm to 1:30 pm
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GFDL Formal Seminar

Thu, Nov 21, 2019, 2:00 pm to 3:00 pm
Location: Smagorinsky Seminar Room 209

AOS Program Seminar

Fri, Nov 22, 2019, 10:30 am to 11:30 am
Location: Sayre Hall Conference Room

Dr. Kikuro Miyakoda Symposium

Fri, Nov 22, 2019, 12:00 pm to 5:00 pm
Location: Smagorinsky Seminar Room 209