Session 8 Extreme Climate Events in the Middle Latitudes—Part I

Wednesday, 9 January 2019: 8:30 AM-10:00 AM
North 122BC (Phoenix Convention Center - West and North Buildings)
Host: 32nd Conference on Climate Variability and Change
Paul Loikith, Portland State Univ., Geography, Portland, OR

Extreme weather and climate events in the mid-latitudes are associated with severe impacts on society and the environment, often having lasting socioeconomic impacts.  Quantification of risks associated with these events remains challenging, particularly under anthropogenically forced non-stationarity in the climate system.  Part of this challenge stems from an incomplete understanding of the physical mechanisms associated with extreme events in the current climate and uncertainty in the fidelity with which climate models resolve key driving mechanisms and processes.  Furthermore, representing and projecting change in extremes using climate models, specifically at local to regional scales, is often challenged by model resolution limitations. This session explores advances in how we analyze extreme events in the mid-latitudes (e.g. polar-air outbreaks, droughts, floods, storms, heat waves) in present and future climates.  Efforts towards improved understanding of the driving physics and dynamics behind mid-latitude extremes, novel approaches to evaluating climate model skill at simulating these features, new approaches to address model resolution limitations, and cutting-edge methodology to assess projections of future change are of particular interest. Interdisciplinary work addressing the applications of scientific research on extremes to stakeholder decision-making processes is encouraged.

8:45 AM
Evaluating Indices of Blocking Anticyclones in Terms of Their Relations with Surface Hot Extremes
Pak-Wah Chan, Harvard Univ., Cambridge, MA; and P. Hassanzadeh and Z. Kuang
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