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Gerald Meehl (CGD) |
Apr. 10, 2007 |
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Bette Otto-Bliesner (CGD) |
Mar. 20, 2007 |
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William Collins (CGD) |
Mar. 13, 2007 |
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Marika Holland (CGD) |
Mar. 06, 2007 |
Abrupt Reductions in the Future Arctic Ice Cover
(50 minutes)
Observed changes in the Arctic climate; Projected change in CCSM3 summer Arctic ice cover (possibility of abrupt transitions & mechanisms driving change); Projections from other climate models
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Adam Schlosser (Massachusetts Institute of Technology) |
Mar. 06, 2007 |
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Rosina Bierbaum |
Feb. 23, 2007 |
Sustainability and Climate Change: Issues for Adaptation
(1 hour 37 minutes)
Need to think about climate change differently; There may be physical, ecological and societal 'tipping points'; Adaptation and mitigation are BOTH necessary; Adaptation research & options to cope are nascent; A rich interdisiplinary research agenda must be tackled now by physical scientists & social scientists, with questions defined by stakeholders
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Joshua Willis (Jet Propulsion Laboratory) |
Feb. 13, 2007 |
The Demise of Sudden Ocean Cooling?
(40 minutes)
Discussions of:
? Historical Perspective
- The tide gauge record
- The altimeter era (1990?s to the present)
? The GRACE and Argo era (2003 to the present)
- Recent cooling
- Data Problems
- Corrected results
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Gabriel Vecchi (NOAA/GFDL) |
Feb. 06, 2007 |
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James Hurrell (CGD) |
Dec. 01, 2006 |
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Cecile Penland (NOAA) |
Nov. 08, 2006 |
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Isaac Held (Princeton University) |
Oct. 11, 2005 |
Idealized Models of the General Circulation
(59 minutes)
The gap between models used to understand atmospheric dynamics and comprehensive general circulation models is discussed. Issues include cloud forcing and atmospheric numerics.
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Isaac Held (Princeton University) |
Oct. 10, 2005 |
The Response of the Hydrological Cycle to Global Warming
(64 minutes)
Researchers studied an archive of general circulation model results. This talk focuses on cases in which the models agree on the effects of climate change on the water cycle, with limited discussion of divergent results.
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Elisabeth Holland (ACD) |
Jun. 29, 2005 |
Global and Regional Nitrogen Cycles
(56 minutes)
What is the global nitrogen cycle and how has it changed? What do observations of deposition tell us about US and Western European atmospheric nitrogen budgets, especially the export of nitrogen pollution?
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V. Ramanathan (University of California San Diego, Scripps) |
Apr. 20, 2005 |
Global Dimming: How Large Is It?
(55 minutes)
The quality of studies conducted on dimming over the past 50 years is explored. Can atmospheric brown clouds explain the dimming observed in North America? The climatic implications of dimming are discussed.
| Abstract
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Jim Smith (ACD) |
Apr. 18, 2005 |
Atmospheric Nanoparticles: Formation and Physicochemical Properties
(55 minutes)
How do nanoparticles form, why are they important, how do we measure their physical properties and their chemical properties, and what is the importance of new nanoparticle formation in urban areas? Results from the Aerosol Nucleation and Real-time Characterization Experiment (ANARCHE) are presented.
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Elisabeth Holland (ACD) |
Apr. 12, 2005 |
The Bio-Atmospheric Nitrogen Cycle
(53 minutes)
What is the global nitrogen cycle and how has it changed? What do observations of deposition tell us about the U.S. and western atmospheric nitrogen budgets? What are the institutional, national, and international science contexts for this work?
| Abstract
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Alan Fried (EOL) |
Mar. 15, 2005 |
Studies of Formaldehyde and Its Role in Atmospheric Processes and Chemical Transformations
(54 minutes)
Formaldehyde, measurement-model relationships, and NCAR's effort to develop tunable diode laser absorption spectroscopy (TDLAS) are discussed. Results from three studies are reviewed: TexAQS (Texas Air Quality Study), TOPSE (Tropospheric Ozone Production about the Spring Equinox), and TRACE-P (Transport and Chemistry Evolution over the Pacific).
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Wojciech Grabowski (MMM) |
Feb. 22, 2005 |
Impact of Explicit Atmosphere-Ocean Coupling on Tropical Intraseasonal Oscillations
(56 minutes)
This talk describes the Madden-Julian Oscillation (MJO) and idealized simulations with prescribed sea surface temperature (SST) to examine the role of free-tropospheric humidity. The presenter then turns to the role of interactive SST: Is the ocean merely responding to the evolving surface forcing or is the atmospheric MJO enhanced by SST changes?
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