125 research outputs found
Evidence for Planetary Wave Breaking from Satellite Data: The Relative Roles of Diabatic Effects and Irreversible Mixing
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Footprints on the Sands of Time: Retracing Harvey Butchart's Exploration of the Grand Canyon through His Annotated Matthes-Evans Maps – Video Recording
No full textabstract: John Harvey Butchart was a mathematics professor at Northern Arizona University from 1945 to 1973. From 1945 to 1987, he spent considerable time in the Grand Canyon, hiking established trails, exploring obscure routes, and discovering new routes. In all, Dr. Butchart spent over 1,000 days in the Grand Canyon and traveled over 12,000 miles in the Canyon. Dr. Butchart kept journals on his explorations and complemented those notes with a heavily annotated copy of the 1927 Francois Matthes and Richard Evans East Half, West Half topographic maps of the Grand Canyon. Embedded in Butchart’s annotated Matthes-Evans maps are compelling stories of adventure, discovery, triumph, and heartbreak. This presentation will highlight selections of those stories and the impact this map has had on subsequent hiking exploration in the Canyon
Coupled chemistry–climate model simulations for the period 1980 to 2020: Ozone depletion and the start of ozone recovery
No full textA three‐dimensional modeling study of the influence of planetary wave dynamics on polar ozone photochemistry
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On the relationship between the quasi‐biennial oscillation, total chlorine and the severity of the antarctic ozone hole
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