1. By Natalie Boelman, Ph.D., Lamont Assistant Research Professor

    The effect of rising summer air temperatures on Arctic flora and fauna may be particularly dramatic because of the low temperatures to which life has adapted in this region. In 2007, a vast and severe wildfire occurred in the Alaskan tundra—a characteristically wet ecosystem. The event was unprecedented, but as global warming continues, tundra fires of this magnitude may become increasingly common. Scientists make use of satellite imagery to understand the ecological consequences of such fires on these remote landscapes. Arctic warming also alters the timing of spring snowmelt and vegetation growth, triggering a cascade of changes that may impact the songbirds that winter in our backyards and migrate to the Alaskan tundra to breed every summer.

    # vimeo.com/21984200 Uploaded 124 Plays 0 Comments
  2. By Andrew Juhl, Ph.D., Lamont Associate Research Professor; Gregory O’Mullan, Ph.D., Adjunct Associate Research Scientist; John Lipsdcomb, Riverkeeper Boat Captain

    Since the passing of the Clean Water Act, New York has made significant investments in wastewater treatment infrastructure and watershed management along the Hudson River estuary, leading to measurable improvements in water quality and ecosystem health. As water quality has improved, demand for public access and recreation on the river has also increased. O’Mullan and Juhl’s water sampling has shown, however, that intermittent sewage contamination persists throughout the estuary. Along with their colleague John Lipscomb, they will discuss findings from the Hudson River Estuary Program, including potential challenges and opportunities for improved management over the next decade.

    # vimeo.com/21769124 Uploaded 51 Plays 0 Comments
  3. with Douglas G. Martinson, Lamont Research Professor
    Lamont-Doherty Earth Observatory

    Antarctica is surrounded by ocean waters that play a tremendous role in its climate. The world’s most powerful current circulates around the Antarctic, preventing warm subtropical surface waters from reaching the coast of the continent, thus perpetuating its glacial state. At the same time, the circulation of global oceans brings deep waters to the edge of Antarctica. These deep waters have been warming strongly over the last 50 years, disrupting the balance between the ocean and the continent. Recent Antarctic expeditions have provided data allowing scientists to estimate the important implications of this disruption.

    # vimeo.com/21656469 Uploaded 42 Plays 0 Comments
  4. Speaker: Neil Pederson, Ph.D.
    Lamont Assistant Research Professor

    Evidence from old-growth trees and ancient timbers recov­ered from homes and barns in the eastern U.S. and Hudson Valley region suggests that the climate and ecology of the previous four centuries may not have been as temperate as once thought. Using dendrochronology, or tree ring analysis, researchers at Lamont-Doherty now see that great droughts have sculpted current old-growth forests. Significant insight has been achieved through the use of certain trees, like the tulip poplar, which provide much longer records than previ­ously thought. Though climate in this region is characteris­tically humid and temperate, research suggests that water availability is an important driver of forest dynamics.

    # vimeo.com/21444976 Uploaded 29 Plays 0 Comments
  5. Heather Savage, Ph.D.
    Lamont Assistant Research Director

    Pratigya Polissar, Ph.D.
    Lamont Assistant Research Professor

    What Do Dead Plants Tell Us About Earthquakes?

    Why do earthquakes occur? Key to understanding this is knowing the strength of faults. Strong faults can sustain large stresses; weak ones fail under much lower stresses. Because we cannot directly observe faults during earthquakes, we evaluate their strength after the fact by measuring how hot surrounding rocks became as they slid past one another (like rubbing your hands together). Such heating ‘cooks’ the fossilized remains of prehistoric plants in the fault rock, which we can measure to get a snapshot of the heating that occurred during an earthquake.

    # vimeo.com/38851289 Uploaded 250 Plays 0 Comments

LDEO Public Lectures

Lamont Doherty Plus

The Public Lectures series began in 1999 in celebration of the 50th anniversary of Lamont-Doherty. Each spring since then, four different Lamont researchers have given presentations on their current research.

For location and directions to Lamont-Doherty…

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The Public Lectures series began in 1999 in celebration of the 50th anniversary of Lamont-Doherty. Each spring since then, four different Lamont researchers have given presentations on their current research.

For location and directions to Lamont-Doherty Earth Observatory visit: LDEO

For registration and more information, contact: (845) 365-8998 or events@ldeo.columbia.edu

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