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SUMMARY:Brad Opdyke - 'Paleoclimate records and stratigraphy from Lake George: what we can learn about climate change and our future'
DESCRIPTION:Brad will discuss the sedimentary record of Lake George going back almost 4 million years. Pollen records indicate much greater rainfall in the past. Records of lake-levels date from 1820\, and are relevant to climate change.  \nFour million years ago atmospheric CO2 levels were close to those we have in 2024. Pollen records indicate that rainfall must been 2 to 3 times what we have experienced over the past several decades. In addition to the deep cores we have taken in the Lake bed\, our team has been studying the stratigraphy of the Bungendore Sands quarry on the south eastern shore of Lake George. These records\, in comparison\, only reach back about 60\,000 years but offer a detailed look at the dynamism of water levels with the Lake. There are times within the 50 to 60 thousand year time window when the Lake was relatively full (37 meters deep) and thick layers of clay were draped over the landscape of the Lake George basin. These clays persist today and make groundwater recharge difficult\, as well as making runoff within the basin very efficient.  \nBiography \nBrad is an Associate Professorial Fellow at the Research School of Earth Sciences and has been doing Paleoclimate research there for the past 30 years. He received his Bachelor’s degree in Geochemistry from Columbia University in NYC in 1984. He received his Masters degree in 1987 and PhD in 1990 from the University of Michigan before joining the ANU in 1994. \nBookings open 21 February 2025. \nBooking link: https://www.trybooking.com/CXZXI
URL:https://friendsanbg.org.au/event/brad-opdyke-paleoclimate-records-and-stratigraphy-from-lake-george-what-we-can-learn-about-climate-change-and-our-future/
LOCATION:ACT
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DTSTART;TZID=Australia/Canberra:20250328T100000
DTEND;TZID=Australia/Canberra:20250328T120000
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SUMMARY:Photographic Group March meeting - Where art helps science
DESCRIPTION:Dr Michael Mulvaney\, the administrator of the citizen science Naturemapr platforms\, will address the monthly meeting of the Photographic Group. His topic will be Where art helps science – Nature Photography and citizen science. The talk will emphasise and explain\, by way of examples\, the valuable contribution that good nature photographers can make to our understanding\, conservation and appreciation of the natural world. The meeting will also include our regular show and tell segment in which participants share their photographic works and the stories behind them. \n\n\n\n\nThe meeting will take place in the ANBG Theatrette. All members of the Friends are welcome to come along. The Photographic Group members have a range of skill sets and cameras\, from digital ‘point and click’ cameras to more complex SLRs. If you would like to attend\, just turn up\, email photo@friendsanbg.org.au\, or contact a committee member.
URL:https://friendsanbg.org.au/event/photographic-group-march-meeting-where-art-helps-science/
LOCATION:ACT
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