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Colloquia Fall 2014

Spring 2014 | Spring 2015

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.

Influence of the Basic State Zonal Flow on Convectively Coupled Equatorial Waves

Juliana Dias
December 12, 2014

Convectively coupled equatorial waves (CCEWs) represent the leading modes of synoptic scale organized convection in the tropical troposphere and they are known to affect weather in both the tropics and midlatitudes. Despite their promine...

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Shortwave and longwave radiative contributions to global warming under increasing CO2

Aaron Donohoe
December 5, 2014

In response to increasing concentrations of atmospheric CO2, high-end general circulation models (GCMs) simulate an accumulation of energy at the top-of-the-atmosphere not through a reduction in out-going longwave radiation (OLR) as one ...

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Recent advances in environmental monitoring using commercial microwave links

Pinhas Alpert
November 21, 2014

The propagation of electromagnetic radiation in the lower atmosphere, at centimeter wavelengths, is impaired by atmospheric conditions. Absorption and scattering of the radiation, at frequencies of tens of GHz, are directly related to th...

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Global-scale convective self-aggregation and the Madden-Julian oscillation

Nathan Arnold
November 14, 2014

The Madden-Julian Oscillation is the dominant mode of tropical intraseasonal variability, but exactly why it occurs remains poorly understood. In the first half of this talk I will argue that the MJO is a large scale consequence of a ten...

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Radiative-Convective Equilibrium and its Instability: Implications for Weather and Climate

Kerry Emanuel
November 7, 2014

The concept of radiative-convective equilibrium (RCE) is the simplest and arguably the most elegant model of a climate system, regarding it as a statistically one-dimensional balance between radiative and convective heat transfer. In spi...

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Analysis and Prediction of Clouds using Satellite All-Sky Radiances: Lessons Learned and Perspectives

Tom Auligne
October 24, 2014

The initialization of cloud parameters is one of the main frontiers for improving short-term prediction skills in numerical weather prediction (NWP) models. We will present the latest developments at the National Center for Atmospheric R...

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Non-QG Sub-mesoscale ocean dynamics and a recent update from the Indian Ocean

Amit Tandon
October 17, 2014

Increased resolution in modeling and in observations in the ocean have revealed rich dynamics at O(km) lateral scales in the ocean associated with O(1) Rossby and Richardson numbers. These sub-mesoscale oceanic processes are very differe...

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Distance Velocity Azimuth Display (DVAD) - New Interpretation and Analysis of Doppler Velocity

Wen-Chau Lee
October 3, 2014

The concept and mathematic framework of the Distance Velocity Azimuth Display (DVAD) methodology is presented. DVAD uses rVd (Doppler velocity scaled by the distance from the radar to a gate, r) as the basis to display,...

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Reducing Uncertainties in Two Significant Climate Forcers: Biomass Burning Emissions and Methane Leakage from Oil and Gas

Dr. Shane Murphy
September 26, 2014

The leakage rate from new oil and gas development in the U.S. is currently a matter of intense debate because the leakage rate affects how beneficial, from a climate perspective, switching from coal to natural gas is. Black carbon, for w...

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Observations of Tropical Cyclone Eyewall Convective Structure and Forcing

Michael Bell
September 19, 2014

Tropical cyclone (TC) eyewall convection plays a critical role in intensity change. Recent studies have suggested that the radial location of eyewall convection relative to the radius of maximum wind is an important component of intensif...

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Land-Use and Land-Cover Change Impacts on Regional Climate

Udaysankar Nair
September 12, 2014

Land-Use and Land-Cover (LULC) change is a forcing factor that is of importance to regional climate. However, LULC change impacts exhibit substantial geographical variation and complex interactions with other forcing factors. This talk w...

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Convective initiation and hydrometeorological influence of extreme storms in subtropical South America

Kristen L. Rasmussen
September 5, 2014

Extreme convection tends to form in the vicinity of mountain ranges, and the Andes in subtropical South America help spawn some of the most intense convection in the world. An investigation of the most intense storms for 11 years of TRMM...

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Faculty-Intro Jamboree Part I

Profs. Barnes, Birner, Fischer, Johnson, O'Dell, Pierce, Randall, Schumacher, Vonder Haar
August 29, 2014


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The Benefits of Coupling to a Mixed-Layer Ocean for Global Climate Simulations

Nicholas Klingaman
August 27, 2014

Prescribing sea-surface temperatures (SSTs) in atmosphere-only model simulations is known to produce erroneous relationships between SSTs, surface fluxes and precipitation. These errors cause biases in representations of the mean climate...

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Fine particulate matter in China: current understanding and challenges

Professor Mei Zheng (visiting ATS from Peking University)
August 21, 2014

none given

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Timescales of CO2 biases in SiB4

Nicholas Geyer, Colorado State University
July 31, 2014

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