Climate Change and Fire Regimes in the Southwest
In the Sierra Nevada, the position of the North Pacific Jet (NPJ) strongly modulates winter hydroclimatology and, therefore, affects both tree growth and fire activity. However, there is some evidence that greater greenhouse gas-driven warming at high northern latitudes weakens the equator-to-pole temperature gradient, yielding so-called Arctic amplification and more extreme weather by altering the orientation of the NPJ. Over the last decade, the polar jet stream – the fast-flowing, high-altitude westerly air current that flows over mid and high latitudes - has experienced more north-south oriented trajectories and slower progressions, consistent with Arctic amplification. In this webinar, Dr. Julio Betancourt discussed recent research, which uses tree-ring data from 1409 – 1990 to reconstruct how the NPJ influences tree growth and fire activity in the Sierra Nevada. Dr. Betancourt has elected not to post slides from this talk, due to the preliminary nature of the research. However, he is happy to answer questions if you contact him directly at email@example.com.
Type of Media
SW CSC Webinar