Colloquia for Spring 2020

Moving beyond tradition: Rethinking field-based teaching and learning in the geosciences

March 05, 2020

Christopher Atchison

Hosted by Emily Fischer

Regardless of the discipline, field-based coursework places an implicit prerequisite on the physical ability needed to navigate the often rugged, ever-changing and unpredictable, natural environment. As a result, most field-focused disciplines marginalize those who do not fit the traditional model of a field practitioner. This marginalization is culturally derived from a social deficit model,…

"Research Opportunities Gleaned from 12 Years in the Wind Energy Industry

February 27, 2020

Gregory Poulos

Hosted by Michael Bell

We explore the atmospheric science challenges afforded by the development of wind energy. Micro- to climate-spatiotemporal scales are discussed. Although wind turbines generally operate in the surface layer and lower boundary layer over meso-beta to meso-gamma spatial scales, their impacts on the atmosphere are much larger, altering the lower atmosphere and, as the deployment of wind…

Future projections of the QBO and QBO teleconnections in global models

February 20, 2020

Yaga Richter

Hosted by Jim Hurrell

The quasi-biennial oscillation (QBO) of the zonal mean zonal wind is the primary mode of variability in the tropical lower stratosphere. The QBO is characterized by alternating easterly and westerly wind regimes propagating downward from ~ 5 to 100 hPa with an average period of 28 months. The QBO influences In this presentation I will describe what is needed to adequately represent…

Sudden Stratospheric Warmings and their Surface Impacts

February 13, 2020

Thomas Birner

Hosted by David Thompson

Sudden stratospheric warmings (SSWs) are midwinter events in which the primary stratospheric circulation, which is characterised by a strong cyclonic vortex over the polar cap, abruptly breaks down, leading to an explosive warming of the polar stratosphere. SSWs modify the circulation throughout the stratospheric column. Furthermore, it is now well established that they tend to modify the…

The Tropospheric Ozone Assessment Report (TOAR): Accomplishments, Open Questions and New Frontiers

February 06, 2020

Owen Cooper

Hosted by Emily Fische

Tropospheric ozone is a greenhouse gas and pollutant detrimental to human health and crop and ecosystem productivity. However, it is difficult to observe and quantify on the global scale, due to its acute spatial variability, resulting from its variable lifetime and its range of sources (injection from the stratosphere, or photochemical production from natural and anthropogenic precursor gases)…

Multi-decadal variability in the North Atlantic jet stream, its connection to ocean variability and the implications for decadal prediction

January 30, 2020

Isla Simpson (NCAR)

Hosted by Jim Hurrell

The characteristics of the North Atlantic jet stream play a key role in the weather and climate of western Europe. While much of the year to year variability in the jet stream arises from internal atmospheric processes that are inherently unpredictable on timescales beyond a few days to weeks, any low frequency variability that can be considered forced by slowly varying boundary conditions…