Biology & Paleo Environment Events
For upcoming seminars, see our calendar here.
June 26th @ 2:00 pm, Comer Seminar Room, Dr. Stella Woodard, Postdoctoral Research Associate, Rutgers University. Host: Heather Ford
"Antarctic Role in Northern Hemisphere Glaciation."
Earth’s climate underwent a major transition from late Pliocene warmth (~3 Ma), when global surface temperatures were on average ~2-3°C higher than today, to a climate dominated by substantial periodic Northern Hemisphere Glaciations (NHG) starting at ~2.73 Ma. The causes of this transition, its impact on ocean hydrography and continental ice, as well as its implications for future climate change are, however, still debated. To investigate this transition, I reconstruct the thermal history of North Pacific deep water and global ice volume during this transition (3.3-2.5 Ma) using benthic foraminiferal Mg/Ca and δ18O. Results indicate an average ~21±10 m sea level equivalent ice growth occurred from 3.15 to 2.75 Ma implying that significant portion of the sea level fall prior to the intensification of NHG occurred due to ice growth on Antarctica. The data also suggest that the expanded Antarctic glaciation imparted changes to inter-hemispheric oceanic budgets of heat and salt, which fundamentally altered deep ocean circulation and contributed to the NHG.
"Metabolic regulation of community behavior in Pseudomonas aeruginosa."
Wednesday May 28th @ 1:15 pm, Comer Seminar Room, Dr. Nina Keul, Postdoctoral Research Scientist, Lamont-Doherty Earth Observatory.
"Double trouble: tracing Ocean Acidification and Ocean Warming in the shells of pteropods."
Monday May 19th @ 11 am, Comer Seminar Room, Special Double Seminar:
Host: Laia Andreu
Dr. Bruce Forbes, Arctic Center, U. Lapland
"Resilience in Social-Ecological Systems of Northwest Eurasia (RISES)."
Dr. Emilie Beaudon, Byrd Polar Research Center, OSU
"Impact of Atmospheric Trace Elements on the “Third Pole” Glaciers: a new 200-year archive from Dasuopu (Himalaya)."
Wednesday May 14th, 2 Talks This Week!
"European glacial dust deposits: A record of abrupt changes of last climate cycle."
"Alaskan Peatlands and the Carbon Cycle in the Context of deglacial and Holocene Climate Change."
Wednesday May 7th @ 1:15 pm, Comer Seminar Room, Heather Ford, Postdoctoral Research Scientist, Lamont-Doherty Earth Observatory
"El Nino and El Padre: a deep equatorial Pacific thermocline during the Pliocene warm period."
Abstract: The equatorial Pacific mean sea surface temperature (SST) is currently characterized by a strong east-west gradient that is tightly coupled to the thermocline structure. During the mid-Pliocene warm period, the Pacific SSTs resembled a modern-day El Niño event, with the eastern waters ~4°C warmer than today while the western Pacific warm pool was relatively stable. Did a deep equatorial thermocline also contribute to this “El Padre” mean state? Here we use the Mg/Ca-values of subsurface dwelling foraminifera to reconstruct the equatorial thermocline and show the equatorial thermocline was deep during the mid-Pliocene and gradually shoaled to its present position. At ~4 Ma, the thermocline sufficiently shoaled in the eastern Pacific to bring cold water to the surface. This initiated atmosphere-ocean feedbacks that enabled the transition from the warm Pliocene to the cold Pleistocene.
Wednesday April 30th @ 1:15 pm, Comer Seminar Room, Brad Linsley, Lamont Research Professor, Lamont-Doherty Earth Observatory
"South Pacific decadal SST variability since 1791 C.E. related to stalls in rising Earth surface temperature: Evidence from corals"
"Rodent teeth and a 2,000 km3 salt deposit: Environmental records of tectonics, climate, and ecology in the Central Andes."
Wednesday April 16th @ 1:15 pm, Comer Seminar Room, Nigel D'Souza, Postdoctoral Research Scientist, LDEO
"The Impact of Natural Oil Seeps on Phytoplankton in the Gulf of Mexico."
"Diversity of eukaryotic microbes: from morphology to environmental sequencing in planktonic ciliates"
**Please note that there is no seminar on April 2nd**
"Shifting Baselines Around Antarctica:
Using Mummies to Understand the Vulnerability of Seals to Climate Change."
Wednesday March 19th @ 1:15 pm, Comer Seminar Room, Natalie Boelman, Adjunct Assistant Professor, LDEO
"ABOVE: The Arctic-Boreal Vulnerability Experiment.
The inside scoop on NASA Terrestrial Ecology's next major field campaign."
Wednesday March 12th @ 1:30 pm, **Seismology Seminar Room**, Aubrey Hillman, PhD Candidate, University of Pittsburgh.
Host: Pratigya Polissar (contact if interested in meeting with speaker)
"Characterizing Long-Term Human Impacts to the Landscape using Lake Sediment Records from Southwestern China."
Wednesday March 5th @ 1.15 pm, Jesse Farmer
Grad student @ LDEO.
"Can Sea Surface temperature records improve our understanding of Late Holocene sea level variability"