This is an exceptional visualization of the history of CO2 in Earth's atmosphere from NOAA's Carbon Tracker. First, it shows historical monitoring of CO2 at Mauna Loa, Antarctica, and other stations over the world. The seasonal swings, especially in the northern hemisphere where most summer vegetation grows, are quite dramatic, but the slow and steady upward progression of CO2 across all latitudes of the planet is striking. The video then shifts and shows the geologic record of CO2 that we know from the study of ice cores in Antarctica & Greenland, first demonstrating the pre-industrial values of the historical era held steady for several thousand years at values much lower than today. It then probes even further back in geologic time, showing how CO2 has varied as the Earth passed through several ice ages and interglacial warm periods in the Pleistocene Epoch. One conclusion is crystal clear - the change in Earth's atmospheric CO2 over the past century is unmistakable and geologically unprecedented in the past half-million years and more.
#climatechange #scienceeducation #globalwarming
Thanks to Barbara am Ende for sharing this photo with the USGS Science in Action Flickr Group! Share your earth science photo for a chance to be featured in upcoming USGS products and social media: http://bit.ly/USGSPhotoPool.
#photography #USGS #geology #WestVirginia #rock
Abstract: Volcanoes spend most of their existence not erupting. This doesn’t mean that there aren’t a multitude of magmatic processes going on underneath. These might include intrusions of new magma, crystallization of existing magma, magma mixing and movement of crystals through the “crystal mush” that sits under the volcano. These processes all leave their compositional and temporal signature on the crystals that form and are subsequently incorporated into the magma that does erupt. I will discuss how examination of zircon crystals in magma can help us unravel the timing and nature of events that occur between volcanic eruptions with a focus on the evolution of the Lassen Volcanic Center in California. Overall, current trace element and U-Th disequilibria age data derived from zircon suggests that an otherwise moribund magmatic system can be brought back to life (rejuvenated) by new intrusions of magmatic that are geologically ephemeral, lasting years to millennia. This conclusion means that the events that lead to the 1915 eruption at Lassen Peak unfolded rapidly before the explosive eruption, the only to occur in California in the last century.
Blogs to read for background:
- GigaGeologyGeologist, Explorer, 2014 - present
- Bakersfield CollegeAssociate Professor of Geology, 2012 - 2014
- Freelance Geologist, GigaPanner & EducatorExplorer, 2011 - 2012
- Fort Hays State UniversityAssistant Professor of Geology, 2004 - 2011
- Lake Superior State UniversityAssistant Professor of Geology, 2001 - 2004
- Western Kentucky UniversityVisiting Assistant Professor of Geology, 2000 - 2001
- University of Wisconsin-MadisonInstructor of Geology, 1998 - 2000
- University of Wisconsin-WhitewaterInstructor of Geology, 1997 - 1998
- Northeast Illinois UniversityInstructor of Geology, 1997 - 1997
- University of Wisconsin-MadisonM.S, Ph.D. Major: Geology; Minor: Geophysics, 1991 - 2000
- Colgate UniversityB.A. Major: Geology; Minor: Mathematics, 1987 - 1991
- River Dell Regional High School1981 - 1987
- Oradell Public School1974 - 1981
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