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Colloquia Spring 2013

Fall 2012 | Fall 2013

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.

Chemical, Biological, and Hygroscopic Properties of Aerosol Organics at Storm Peak

A. Gannet Hallar
May 9, 2013

Aerosols affect the Earth’s radiation balance directly by scattering sunlight and indirectly through their role as cloud condensation nuclei (CCN). These effects are enhanced for hygroscopic aerosols, which absorb water as a function o...

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The stratospheric aerosol layer: uncertainties in our understanding and consequences for climate change and geoengineering

Thomas Peter
May 2, 2013

Stratospheric aerosols are important climate forcers as they reflect a part of the incoming solar radiation, thereby cooling the earth surface and troposphere, and absorb a part of the outwelling terrestrial radiation, thereby heating th...

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Improvements and Remaining Challenges in the Parameterization of Microphysics and its Impact on Deep Convection

Hugh Morrison
April 25, 2013

With increasing use of high resolution (convection-permitting) models for numerical weather prediction and climate simulation, microphysics has moved to the forefront in terms of physical parameterizations. This is because without the us...

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Impact of Chikira-Sugiyama Cumulus Scheme in Climate and Variability

Minoru Chikira
April 18, 2013

A cumulus scheme developed in Chikira and Sugiyama (2010) is an offshoot of the prognostic Arakawa-Schubert scheme. But it is characterized by state-dependent entrainment rate based on Gregory (2001) and a spectral representation of clou...

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Improving Communication of Weather Forecasts and Warnings to Aid Decisions

Rebecca E. Morss
April 11, 2013

Future weather is inherently uncertain, and weather forecasts are received and used every day by millions of people. This makes weather forecasting a common form of environmental risk communication that is familiar to much of the public....

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A University Perspective on Climate Modeling

Dave Randall
April 4, 2013

Climate modeling began about 50 years ago, as a purely academic endeavor. Although things have changed considerably, especially during the past 20 years, universities have a continuing major role in model development and applications, an...

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Precipitation Physics Revealed through Dual-polarization Radar Observations and Modeling

Matt Kumjian
March 28, 2013

Dual-polarization radar data provide great insight into the types and distribution of hydrometeors in storms. This information can be used to study a variety of precipitation processes. This talk will cover radar observations of warm-rai...

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Rossby Wake Breaking and Transport between the Tropics and Extratropics above the Subtropical Jet

Cameron Homeyer
March 14, 2013

Rossby wavebreaking is an important mechanism for the two-way exchange of air between the tropical upper troposphere and lower stratosphere and the extratropical lower stratosphere. We present a 30-year climatology (1981-2010) of anticyc...

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Tropical cyclone genesis factors in paleoclimate simulations

Robert Korty
March 7, 2013

Over the last twenty years, a pioneering group of geomorphologists has developed processes for extracting information about prehistoric, landfalling hurricanes back through the last several millennia by studying sedimentary over-wash dep...

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Shock-Like Structures in the Hurricane Boundary Layer

Wayne Schubert
February 22, 2013

This talk will present high horizontal resolution solutions of an axisymmetric, constant depth, slab boundary layer model designed to simulate the radial inflow and boundary layer pumping of a hurricane. For intense vortices the u(partia...

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The challenge of tropospheric ozone in the western US

Dr. Dan Jaffe, Professor
February 14, 2013

Ozone is a natural component of the stratosphere and a minor component in the lower atmosphere, but anthropogenic smog significantly enhances the concentrations in the troposphere. As a strong oxidizer, ozone will react with many substan...

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Understanding Arctic Mixed-Phase Clouds: Use of Doppler Velocity Spectra

Hans Verlinde
February 7, 2013

Observations reveal that long-lasting, mixed-phased stratiform clouds may be observed in all months of the year in the Arctic lower troposphere. These clouds have a large impact on radiative transfer through the atmosphere, and hence the...

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Why is the ITCZ in the Northern Hemisphere? And why might it have shifted southward in the late 20th century?

Dargan Frierson
January 31, 2013

The Northern Hemispheric maximum of the tropical rainfall is usually thought to be caused by properties of tropical landmasses, such as the size and shape of continents. However, a variety of recent studies have established that conditio...

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Faculty Intro Jamboree Part II

Profs. Collett, Kreidenweis, Maloney, Pierce, Rutledge, Schubert, van den Heever
January 24, 2013

What: 5–10 min intros by individual faculty members
Who: Profs. Collett, Kreidenweis, Maloney, Pierce, Rutledge, Schubert, van den Heever
Why: provide overview of research areas & groups in the department
Why2: gather for cookies &

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