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DTSTART;TZID=America/New_York:20200305T120000
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SUMMARY:Environmental Sciences Seminar: Tamara Harms\, University of Alaska Fairbanks - Institute of Arctic Biology
DESCRIPTION:Speaker: Tamara Harms\, Ph.D.\, Associate Professor\, University of Alaska Fairbanks\, Institute of Arctic Biology \nTitle: Permafrost Thaw and Changing Cycles of the Elements of Life \nAbstract: Boreal and arctic ecosystems are undergoing rapid change\, including more frequent fires\, thawing permafrost\, increasing temperature\, and more extreme precipitation events. Though the effects of climate change on carbon emissions from high-latitude ecosystems are well documented\, changes to cycles of nitrogen and phosphorus remain poorly understood\, and may cause feedbacks to carbon emissions. My group studies the fate and transport of carbon and nutrients in arctic and boreal catchments. Using in situ studies of nutrient uptake\, we have shown that nitrogen released from thawing permafrost is likely hydrologically exported from arctic catchments\, whereas phosphorus is retained in soils. We are also developing metrics to establish stream chemistry as an indicator of ecological resilience and state changes in boreal catchments. Using high-frequency data collected by automated instream sensors\, we have found surprising increases in nitrate concentration following rain in streams draining catchments where permafrost is likely thawing. Our research suggests large\, climate-driven changes to the nitrogen cycle of high-latitude ecosystems\, resulting in greater flux to downstream ecosystems. \nBio: Tamara Harms is an ecosystem ecologist and biogeochemist with interests in cycles of carbon\, nitrogen\, and phosphorus. She is an associate professor at the University of Alaska Fairbanks where she studies the effects of changing climate\, hydrologic\, and disturbance regimes on elemental cycles. She focuses on how hydrologic flowpaths mediate reaction and transport of materials and has worked in deserts\, cities\, and high-latitude ecosystems\, all places where hydrologic connectivity is changing rapidly. \nJoin this Seminar on Zoom by clicking here. \nFor more information\, contact Doris Switzer at dswitzer@gc.cuny.edu
URL:https://asrc.gc.cuny.edu/event/environmental-sciences-seminar-tamara-harms-university-of-alaska-fairbanks-institute-of-arctic-biology/
LOCATION:ASRC 5th Floor Data Visualization Room\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Environmental Sciences
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DTSTART;TZID=America/New_York:20200313T124500
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DTSTAMP:20260528T053059
CREATED:20200309T164209Z
LAST-MODIFIED:20200311T203715Z
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SUMMARY:(CANCELLED) Environmental Science Seminar Series: Jay R. Herman\, University of Maryland and NASA Goddard Space Flight Center
DESCRIPTION:Speaker: Dr. Jay R. Herman\, Research Scientist\, University of Maryland and NASA Goddard Space Flight Center. \nTitle: An Extraterrestrial View of a Blue Planet from a Gravity Balance Point \nAbstract: Using a robotic probe\, we have been observing a blue colored planet for the past 4 orbital cycles around its somewhat dim star in the hope of detecting any signs of advanced civilization or any civilization at all. While an argument has been made that a costly lander might be better suited for detecting signs of a civilization that might have existed or even currently exits. Nothing has been detected so far other than an oxygen contaminated atmosphere containing deadly amounts of ozone\, very high levels of ultraviolet radiation\, some indication of dust blowing around from obviously desiccated areas\, and some seasonal green stuff of unknown origin. The instrument has recently detected some flashing lights in the main color range of its dim star that some have interpreted as an attempt to signal by primitive life forms. More conservative researchers have suggested that  these  flashes  are  passive  atmospheric  phenomena  associated  with  water  bearing  white  stuff  circulating  in  the  atmosphere. This planet has a large moon of unknown origin that also appears to be uninhabited and has suffered severe bombardment sometime in its past. This bombardment may have destroyed life on its larger blue neighbor. Suggestions have been made that we are looking in the wrong part of the spectrum and should look for the presence of something very stable that is never produced in the natural world such as chlorofluorocarbons useful in cooling off possible inhabitants on this very overheated planet. \nWritten with Plausible Deniability by Jay Herman\nUniversity of Maryland Baltimore County\nRumored to have an office at NASA/Goddard Space Flight Center \nBio: I started observing the earth in 1938. Graduated from Clarkson College in 1959 BS in Physics. Worked at IBM on the development of the first transistors for use in computers. Worked on high temperature plasma shock wave theory used in Tokamaks. Graduated from Pennsylvania State University with a PhD in Physics in 1965 Started work at NASA Goddard Space flight Center in 1965 and graduated therefrom in 2009. Studies planetary atmospheres Venus and Mars and finally the Earth Upon NASA graduation\, started working at the University of Maryland from 2009 – present. Professional Scientific Interests: Earth’s atmosphere\, Ultraviolet radiation\, satellite instruments. Ground‐based instruments (Pandora)
URL:https://asrc.gc.cuny.edu/event/environmental-science-seminar-series-jay-r-herman-university-of-maryland-and-nasa-goddard-space-flight-center/
LOCATION:ASRC Auditorium\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Environmental Sciences
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