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Colloquia Spring 2012

Fall 2011 | Fall 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.

Making Sense of Clouds with the Transilient Matrix

David Romps
May 3, 2012

Clouds transport water, trace gases, and momentum through the atmosphere in a way that is not at all "diffusive". Instead, clouds transport these things in a "transilient" way, jumping across whole layers of the atmosphere. As a result, ...

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Amazon Heat Sources: Regional and Remote Importance

Pedro L. Silva Dias
April 30, 2012

The South American Monsoon System (SAMS) is now clearly recognized as one of the major features of the tropical circulation. The South Atlantic Convergence Zone (SACZ) and the Amazon Heat Source, are major features of the SAMS and consti...

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Response of High-Impact Weather to Climate Variability and Change

Greg Holland (NCAR)
April 5, 2012

Societal vulnerability to weather arises largely from relatively rare events at the extremes of the spectrum. Examples include: extended droughts, heat waves, major hurricanes, extreme local rainfall and snowfall, ice storms, European wi...

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How Well Do We Know the Earth’s Energy Budget?

Tristan L’Ecuyer
March 29, 2012

Our ability to predict climate change is fundamentally connected to our understanding of the processes that govern global energy balance. Changes in global temperature are ultimately governed by the net flux of energy into the Earth-atmo...

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Impact of Tropical Cyclones and Transient Polar Disturbances on the North Pacific Subtropical Jet: Downstream Baroclinic Development and a Subsequent Intense Cyclone Event over the United States

Lance Bosart (University at Albany/SUNY)
March 22, 2012

Observations suggest that the latitudinal location, longitudinal extent, and overall strength of the North Pacific subtropical jet (STJ) can vary on intraseasonal and synoptic time scales in response to poleward- directed diabatically dr...

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Teary Eyes to Blue Skies: Using Models and Observations to Establish a Global Picture of Peroxyacetyl Nitrate (PAN)

Emily Fischer
March 19, 2012

Most reduced trace gases emitted into the atmosphere are removed by oxidation including greenhouse gases, air pollutants, and aerosol precursors. The primary atmospheric oxidants, the hydroxyl radical (OH) and ozone (O3), play critical r...

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The formation and growth of ultrafine atmospheric aerosols

Jeffrey Pierce (Dalhousie University)
March 8, 2012

Atmospheric aerosols have important influences on climate through their interaction with clouds and radiation. The extent of aerosols' climate impact depends greatly on the aerosol concentration, size and composition. A major source of a...

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Mesoscale Controls on Mountain Climate - From Snowy Peaks to Tropical Islands

Justin Minder (Yale University)
March 1, 2012

We still largely lack a process-based understanding of how mesoscale terrain-related forcings and feedbacks act to shape the response of mesoscale climate to large-scale forcings. However, such an understanding must be central in any att...

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Measurements of Drop-Size Distributions in Thunderstorms during VORTEX2

Katja Friedrich
February 28, 2012

When studying the influence of microphysics on the near-surface buoyancy tendency in convective thunderstorms, in-situ measurements of microphysics near the surface are essential and those are currently not provided by most weather radar...

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Influence of Meridional Constraints on Low-Frequency Variability and its Response to Climate Change

Elizabeth Barnes
February 23, 2012

The eddy-driven jet is located in the midlatitudes, bounded on one side by the pole and often bounded on the opposite side by a strong Hadley-driven jet. This work explores how the eddy- driven jet and its variability persist within thes...

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Progress in Diagnosing, Partitioning, and Understanding of Cloud Feedbacks

Mark Zelinka
February 20, 2012

The response of clouds to a warming climate represents one of the largest sources of disagreement among model projections of future climate change. My research seeks to quantify, understand, and ultimately constrain cloud feedbacks using...

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The response of the Tropical Pacific and ENSO to Global Warming

Pedro Di Nezio
February 16, 2012

I will present new ideas explaining two central questions about the response of the tropical Pacific climate to increasing greenhouse gases:

  1. Is the equatorial Pacific going to become El Niño- or La Niña-like?
  2. Is ...

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Towards a Better Understanding of Climate and Climatic Change Through Satellite Remote Sensing

Chris O'Dell
February 9, 2012

For over three decades, the climate science community has sought to clarify the most important forcing and feedback mechanisms related to global climate change. Significant uncertainties remain in our projections of climate change, in p...

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