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Colloquia Fall 2011

Spring 2011 | Spring 2012

Colloquia are held in ATS room 101; Discussion will begin at 3:30pm. Refreshments will be served at 3:00pm in the coffee lounge. Please contact Thomas Birner [thomas at] for more information.

Cosmic Rays, Aerosols, Clouds and Other Adventures in Aerosol Microphysics

Jeffrey Pierce
November 17, 2011

Cloud cover has been reported to correlate with the flux of Galactic Cosmic Rays (GCRs) to the troposphere. This potential GCR/cloud connection has been heralded by some as a driver for 20th temperature increases because GCR fluxes decr...

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A Year in the Life of the Extreme Ice Survey--and New Directions for the Future

James Balog
November 9, 2011

National Geographic adventurer and photographer James Balog will talk about how and why he founded the Extreme Ice Survey, connecting art and science to communicate to the general public how climate change and other human activities impa...

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The Ups and Downs of Being an Atmospheric Aerosol: Interpreting Particle Flux Measurements Over Tropical and Temperate Forests

Delphine Farmer
November 3, 2011

We made the first chemically-resolved aerosol flux measurements over temperate and tropical forests during the BEARPEX-07 (Biosphere Effects on AeRosols and Photochemistry EXperiment, Blodgett Forest, California) and AMAZE-08 (AMazonian ...

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Tropical Cyclones and Their Role in Energy Transfer Between the Tropics and Extra-Tropics

Greg Tripoli
October 20, 2011

Moist convective systems in the tropics inject large masses of high entropy / high angular momentum air into the upper troposphere (the so called over world) inflating a "tropical tropospheric energy bubble" (TTEB). To complete the glob...

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Response of precipitation to climate change: theory, simulations, and observations

Paul O'Gorman (MIT)
October 6, 2011

Climate change is expected to strongly perturb the atmospheric hydrological cycle, with potentially large changes in the distribution of precipitation. In this talk, I will focus on the factors controlling changes in mean precipitation a...

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Climatic Consequences of Nuclear Conflict: Nuclear Winter Still a Threat

Alan Robock
September 29, 2011

A nuclear war between Russia and the United States, using the reduced arsenals of 4000 total nuclear weapons that will result by 2017 in response to the New START treaty, could still produce nuclear winter. A nuclear war between India an...

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Measurement and simulation of fine particle emissions from combustion systems

Allen L. Robinson
September 26, 2011

Atmospheric particles play an important role in climate forcing; they are also strongly associated with adverse human health effects. Motor vehicles, wood stoves, and other combustion processes are major sources of atmospheric particles...

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National Weather Service Field Operations: Accomplishments, Challenges, and Opportunities

Steve Apfel, Nezette Rydell, Jennifer Stark, Paul Wolyn
September 15, 2011

Operational meteorology is alive and well along the Front Range of the Rocky Mountains. In this seminar, we will all have the opportunity to meet the MICs (Meteorologists in Charge) from each of the nearest National Weather Service Offi...

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Surface and Aerosol Effects on Rainfall: Amazon Basin and the Megacity of Sao Paulo, Brazil

Maria Assunção F. Silva Dias
September 8, 2011

Possible effects of surface and aerosol changes on rainfall in the Amazon Basin and in the Mega-city of Sao Paulo, Brazil, will be presented as part of an effort of cause attribution of observed changes. In the Amazon basin most of the ...

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East Pacific ITCZ Variability Over Three Decades of Satellite Data

Gudrun Magnusdottir
September 1, 2011

The intertropical convergence zone (ITCZ) is one of the most recognizable aspects of the global circulation as seen from space yet we are hard pressed to come up with a clear definition of the ITCZ as seen in instantaneous cloud fields. ...

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The Generation of Turbulence Around Thunderstorms

Todd Lane
August 25, 2011

Anyone who has flown in a commercial aircraft is familiar with turbulence. Unexpected encounters with turbulence pose a safety risk to airline passengers and crew, can occasionally damage aircraft, and indirectly increase the cost of air...

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