CIRA Seminars

Filter By Seminar Year (2007 thru 2018)

2016 CIRA Seminars

Friday, September 9, 2016 - 11:15 @ ATS Room 101
Presenter: Jorgen B. Jensen, NCAR/EOL/RAF

Autoconversion, that is the initial formation of drizzle drops from smaller cloud droplets through coalescence, is a critically important process to get right in climate models.

Thursday, September 8, 2016 - 10:00 @ CIRA Director's Conference Room 135
Presenter: Melissa Petty, CIRA Boulder

GSD's Forecast Impact and Quality Assessment Section provides quality assessment services to the FAA and NWS to support the evaluation of their aviation weather products.  For the FAA’s Aviation Weather Research Program (AWRP), they serve as the Quality Assessment Product Development Team (QA PDT) to perform in-depth evaluations of AWRP-sponsored products as part of the formal process for transition into operations.  For the NWS they perform assessments as well as develop automated verification tools to track NWS product performance according to operational performance requirements.  Produc

Tuesday, September 6, 2016 - 10:00 @ CIRA Director's Conference Room 135
Presenter: Max Marchand, Postdoctoral Candidate

Max Marchand is a candidate for a Postdoctoral Position open at CIRA related to initializing forecast models with high-resolution information from next-generation geostationary environmental satellites.

Friday, September 2, 2016 - 11:15 @ ATS Room 101
Presenter: Richard A. Anthes, President Emeritus, UCAR and UCAR COSMIC Program; Therese Rieckh, University of Graz, Austria and UCAR COSMIC Program; Shay Gilpin, University of California Santa Cruz and UCAR SOARS and COSMIC Programs,

The launch of the proof-of-concept mission GPS/MET (Global Positioning System/Meteorology) in 1995 began a revolution in profiling Earth’s atmosphere through radio occultation (RO).   The six-satellite constellation, FORMOSAT-3/COSMIC (Formosa Satellite mission #3)/Constellation Observing System for Meteorology, Ionosphere, and Climate), launched in 2006, has proven the theoretical capabilities of RO to provide accurate and precise profiles of electron density in the ionosphere and refractivity, containing information on temperature and water vapor, in the stratosphere and troposphere.

Tuesday, August 30, 2016 - 10:00 @ CIRA Director's C.R. 135
Presenter: Dr. Jung-Hoon Kim, NWS Aviation Weather Center, Kansas City, Missouri Affiliated with CSU/CIRA

From operational NWP model output, global turbulence forecasts are used to compute a set of diagnostics that identify regions of strong spatial gradients, and using an empirical mapping technique, convert these indicators into an equivalent energy dissipation rate to the 1/3 power. This atmospheric turbulence metric is the ICAO standard for aircraft reporting and thus provides a convenient basis for verification.

Monday, August 29, 2016 - 10:00 @ CIRA Director's C.R. 135
Presenter: Ju Hye Kim ,

Ju Hye Kim is a candidate for a Postdoctoral Position open at CIRA related to initializing forecast models with high-resolution information from next-generation geostationary environmental satellites.

Friday, August 26, 2016 - 11:15 @ ATS Room 101
Presenter: Scott Powell, NOAA Climate and Global Change Postdoctoral Fellow Department of Atmospheric Science, Colorado State University

The Madden-Julian Oscillation (MJO) is a major component of sub-seasonal variability in tropical precipitation, and it also impacts extreme precipitation events in the subtropics and the mid-latitudes. Although it was discovered 45 years ago, the dynamics of its origin have long remained unclear and climate models continue to struggle with simulating realistic MJO events.

Monday, August 22, 2016 - 03:30 @ ATS Room 101
Presenter: Nick Klingaman, University of Reading

The Super-Parameterized Community Atmospheric Model (SPCAM) is a shining light among contemporary models in the dark abyss of simulated tropical variability, particularly for the Madden-Julian oscillation (MJO).  In atmosphere-only mode, SPCAM simulates a robust MJO, which grows stronger when SPCAM is coupled to a dynamical ocean (SPCCSM).  However, SPCCSM shows similar cold tropical SST errors to those that degrade the representation of the MJO in other models, such as the Hadley Centre model.  The representation of air-sea interactions in SPCCSM is rather poor -- the diurnal cycle is abse

Tuesday, August 16, 2016 - 02:00 @ Director's C.R. #135
Presenter: Brian DeCicco, Capt. USAF, Satellite Operations Flight Commander, Joint Typhoon Warning Center

Abstract to be posted soon

Thursday, July 28, 2016 - 02:00 @ CIRA Director's Conference Room
Presenter: Lide Jiang, Xiaoming Liu, SeungHyun Son, CIRA, College Park MD

In this paper, we provide an overview of the progress on the evaluations of the Visible Infrared Imaging Radiometer Suite (VIIRS) ocean color products with long-term time series and more in situ data for matchup analysis.

Friday, June 24, 2016 - 11:00 @ ATS Room 101
Presenter: Chris Eldred, Postdoctoral Fellow, LAGA, University of Paris 13

It is well known that the inviscid, adiabatic equations of atmospheric motion constitute a non-canonical Hamiltonian system, and therefore posses many important conserved quantities such as as mass, potential vorticity and total energy. However, until recently, few numerical models possessed similar conserved quantities. Over the past decade, there has been a great deal of work on the development of mimetic and conservative numerical schemes for atmospheric dynamical cores using Hamiltonian methods.

Friday, May 6, 2016 - 02:30 @ ATS Room 101
Presenter: Dr. Thomas C. Peterson, President of the World Meteorological Organization’s Commission for Climatology, 2016 Distinguished Alumni Award Recipient

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 addition to describing how average global temperatures are determined and their implications, this talk will highlight the results of the latest science on global climate data as well as the latest political developments on sharing climate data across the world.

Friday, April 29, 2016 - 11:15 @ ATS Room 101
Presenter: Steven M. Cavallo, University of Oklahoma School of Meteorology

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 with features such as sea ice, moisture, and surface cyclones. Unfortunately little is known regarding how polar processes interact with lower latitude weather and climate.

Friday, April 22, 2016 - 11:15 @ ATS Room 101
Presenter: Kelley Barsanti, Assistant Professor, Chemical/Environmental Engineering, Center for Environmental Research and Technology

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 affecting air quality and climate. Until recently, a significant mass fraction of NMOCs in BB emissions (up to 80%) has remained uncharacterized or unidentified. Models used to simulate the air quality impacts of BB thus have relied on very limited chemical characterization of the emitted compounds.

Friday, April 15, 2016 - 11:15 @ ATS Room 101
Presenter: Daniel J. Jacob, Vasco McCoy Family Professor of Atmospheric Chemistry and Environmental Engineering

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 group to use satellite observations for quantifying methane emissions in North America, including integration with new information from aircraft campaigns and from bottom-up emission inventories.

Friday, April 8, 2016 - 11:15 @ ATS Room 101
Presenter: Greg McFarquhar, Professor, Department of Atmospheric Science, University of Illinois

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 weather and climate.

Friday, April 1, 2016 - 11:15 @ ATS Room 101
Presenter: Prasad Gogineni, The Center for Remote Sensing of Ice Sheets, University of Kansas

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 instrumentation primarily to sound ice and image the ice-bed interface, map near-surface internal layers in polar firn and ice, measure the thickness of snow cover over sea ice, map near-surface internal layers in polar firn with fine resolution of about 3 cm), and measure surface elevation with high precision.

Thursday, March 31, 2016 - 03:30 @ ATS 101
Presenter: Paul Stoy, Faculty Candidate, Assistant Professor, Montana State University

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 surface and the atmosphere. It is our responsibility to understand these processes. Here, I address the ability of surface-atmosphere exchange measurements to help reduce major uncertainties in our understanding of anthropogenic radiative forcing, namely the role of trace gases and aerosol/cloud interactions.

Monday, March 21, 2016 - 03:30 @ ATS Room 101
Presenter: Allison A. Wing, Ph.D., Faculty Candidate, NSF AGS Postdoctoral Research Fellow, Lamont-Doherty Earth Observatory

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 tropical convection, which results in a large fraction of tropical cloudiness and rainfall. Here, we investigate the organization of tropical convection in the context of self-aggregation, a spontaneous transition in idealized numerical simulations from randomly distributed to organized convection despite homogeneous boundary conditions.

Monday, March 7, 2016 - 03:30 @ ATS Room 101
Presenter: Dr. Michael M. Bell, Assistant Professor, University of Hawai`i at Mānoa

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 addition to the operational radar observations, a Doppler on Wheels mobile polarimetric radar was deployed to Oahu from 22 October to 13 November 2013 as part of the Hawaiian Educational Radar Opportunity (HERO). The project was the first dual-polarization field experiment performed on the island of Oahu, and one of the few research radar deployments in Hawaii.

Thursday, February 25, 2016 - 04:00 @ ATS Room 101
Presenter: Benjamin Crawford, Department of Meteorology, University of Reading

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 extremely heterogeneous landscapes and the presence of intense anthropogenic activity. This results in drastically altered surface-atmosphere exchanges of energy, water, trace gases, and momentum across a range of scales.

Monday, February 22, 2016 - 03:30 @ ATS Room 101
Presenter: Pierre Gentine, Assistant Professor, Earth Institute, Department of Earth and Environmental Engineering, Columbia University

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 photosynthesis and evapotranspiration.

In this presentation I will present how the diurnal and seasonal cycles of the hydrologic cycles are intertwined, using the weak temperature gradient approximation and in situ observations. These results will emphasize the role of early morning fog as a key switch and regulator of rainforest seasonality.

Monday, February 15, 2016 - 03:30 @ ATS Room 101
Presenter: Kristen Lani Rasmussen, Advanced Study Program Postdoctoral Fellow, NCAR

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 shows convection varying not only in amount but also in its very nature across the oceans, continents, islands, and mountain ranges of the tropics and subtropics. 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 deep convection in the world.

Friday, February 5, 2016 - 11:15 @ ATS Room 101
Presenter: Chad Hoffman, Assistant Professor, Forestry Rangeland Stewardship, Colorado State University

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 dominant processes that determine wildfire behavior such as convective and radiative heat transfer, aerodynamic drag and buoyant response of the atmosphere to heat released by the fire.

Thursday, February 4, 2016 - 03:30 @ CIRA Director's Conference Room
Presenter: Jason Burks and Ken Sperow, NASA/Marshall SFC and NWS/CIRA/MDL

The Just In Time Training (JITT) plugin for Advanced Weather Information Processing System (AWIPS) II will allow training to be integrated directly into the decision support system of the National Weather Service. By integrating training into the decision support system the barrier for operational forecasters to access training while interrogating meteorological data will be lowered therefore enhancing the training process.