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Colloquia Spring 2016

Fall 2015 | Fall 2016

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.

The Story of Climate Data

Dr. Thomas C. Peterson (CSU ATS Ph.D. 1991)
May 6, 2016

From the first instrumental climate observations in 1697 up to the global temperature record set last year, professional climate scientists owe a debt of gratitude to the millions of observations taken by volunteers around the world. In ...

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Herbert Riehl Memorial Award and Alumni Award for Outstanding Research

Leah Grant
May 6, 2016

The 2016 Riehl Award for an outstanding paper based on MS research went to Jack Kodros. Jack, who is advised by Jeff Pierce, won for his recent Atmospheric Chemistry and Physics paper entitled Uncertainties in global aerosols and cli...

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Linking Arctic to lower latitude processes through resilient tropopause-based vortices

Steven M. Cavallo
April 29, 2016

Born in polar regions, a tropopause polar vortex (TPV) is an often sub-synoptic cyclone embedded within the larger-scale tropospheric polar vortex. TPVs can be long-lived phenomena with monthly time scales, and have complex interactions ...

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Exploring Chemical Complexity in Biomass Burning Emissions and Air Quality Models

Kelley Barsanti
April 22, 2016

Biomass burning (BB) is the second largest global emissions source of non-methane organic compounds (NMOCs). Chemical transformations of emitted NMOCs lead to the production of ozone (O3) and secondary particulate matter (PM), thereby af...

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Quantifying methane emissions in North America using satellites

Daniel J. Jacob (Vasco McCoy Family Professor of Atmospheric Chemistry and Environmental Engineering)
April 15, 2016

Improved understanding of methane emissions and their trends is critical for climate policy. Satellite observations provide an emerging resource for continuous global mapping of atmospheric methane. I will talk about ongoing work in my g...

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Use of In-Situ Observations for Quantifying Ice Cloud Microphysical Properties and Processes, and their Uncertainties

Greg McFarquhar
April 8, 2016

Some of the most fundamental and complex problems in climate and weather research today are our poor understanding of the basic properties of clouds and our inability to determine quantitatively the many effects that clouds have on weath...

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Radar Instrumentation for Remote Sensing of Ice, Snow, and Soil Moisture

Prasad Gogineni
April 1, 2016

We developed radar instrumentation operating over a frequency range extending from approximately 14 MHz to 36 GHz for operation on long- and short-range aircraft and Uninhabited Aircraft Systems (UASs). We developed our existing radar in...

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Toward an improved understanding of the role of surface-atmosphere exchange in climate services

Paul Stoy
March 31, 2016

The ongoing climate emergency of 2016 emphasizes ever more strongly the central role of humans in the climate system. Many of the climate changes that we are making involve the exchange of trace gases, water, and energy between the land ...

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Organization of tropical convection: Self-aggregation and spontaneous tropical cyclogenesis

Allison A. Wing, Ph.D., NSF AGS Postdoctoral Research Fellow, Lamont-Doherty Earth Observatory, Columbia University
March 21, 2016

Tropical clouds and relative humidity play a key role in both the planetary energy balance and the sensitivity of global climate to radiative forcing. Both clouds and relative humidity are also strongly modulated by the organization of t...

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New Insights into Tropical Clouds and Hurricanes using Polarimetric Radar

Dr. Michael M. Bell, Assistant Professor, University of Hawaii at Manoa
March 7, 2016

Recent upgrades to the U.S. operational radar network now allow for polarimetric measurements of tropical convection and cyclones near Hawaii and the U.S. coast, providing new opportunities for studying these weather phenomena. In additi...

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Surface-atmosphere exchanges of energy and carbon in urban environments

Benjamin Crawford
February 25, 2016

Cities account for less than 5% of total land surface, yet are home to over half the world's population and the majority of anthropogenic greenhouse gas emissions. Relative to more natural environments, urban areas are characterized by e...

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Biosphere-atmosphere interactions and seasonality in the continental Tropics

Pierre Gentine
February 22, 2016

The seasonal cycle in the continental Tropics remains poorly understood. Climate models for instance do not reproduce the main features of tropical climates and exhibit major deficiencies in the Amazon with incorrect phase of photosynthe...

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The Global Nature of Convection: Perspectives from the TRMM satellite

Kristen Rasmussen
February 15, 2016

For over 16 years, the Precipitation Radar of the Tropical Rainfall Measuring Mission (TRMM) satellite detected the three-dimensional structure of significantly precipitating clouds in the tropics and subtropics. The multi-year dataset...

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Predicting the spread of wildfires: The importance of fire interactions with the atmosphere, ecosystems, and topography

Chad Hoffman (Assistant Professor, Forestry Rangeland Stewardship, CSU)
February 5, 2016

Advancements in computing power have created new opportunities for the use of numerical models in wildfire research. Models like the Wildland Fire Dynamics Simulator (WFDS) and FIRETEC attempt to represent interactions between the domina...

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Aerosols and Climate Forcing: New Thoughts, Future Direction

Lorraine A. Remer (JCET-UMBC)
January 26, 2016

Everybody has heard about climate change or global warming, and most people can link this change to the forcing elements of either carbon dioxide or greenhouse gases. It is simple to understand how greenhouse gases trap outgoing long wav...

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Cloud physics and chemistry from single droplets and crystals to a few cubic centimeters

Will Cantrell
January 22, 2016

To understand Earth's climate and weather, you must understand clouds on scales ranging from the characteristic size of water molecules (a few Angstroms) to synoptic and global circulations (hundreds to thousands of kilometers). Large sc...

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