For questions about GMD seminars, contact Julie Singewald, Phone: (303) 497-6074 or Ann Thorne, Phone: (303) 497-4600.

Visitor Information: The Visitors Center and entrance to the Boulder Department of Commerce facilities are located on Broadway at Rayleigh Road. All visiting seminar attendees, including pedestrians and bike riders, are required to check in at the Visitors Center at the Security Checkpoint to receive a visitor badge. Seminar attendees need to present a valid photo ID and mention the seminar title or the speaker's name to obtain a visitor badge. If security personnel asks for a point of contact please list Ann Thorne (x4600) or Julie Singewald (x6074).

If you are a foreign national without permanent residency, please call Ann Thorne at 303-497-4600 (leave a message including your name) or send an e-mail to Julie Singewald at least one day before the seminar if you plan to attend.

Upcoming Seminars



Speaker: Dr. Laura Riihimaki
Laura Riihimaki has over 12 years of experience working with ground-based remote sensing measurements, using her physics background to develop observational retrievals, characterize uncertainties, and bridge the gap between observations and models. In 2019, she began a job as a research scientist with the Global Monitoring Division at the NOAA Earth Systems Research Laboratory. Previously (2008-2018), she worked in the Atmospheric Sciences and Global Change division of the Pacific Northwest National Laboratory. From 2012-2019, she served as a translator for the Department of Energy's Atmospheric Radiation Measurement (ARM) Climate Research Facility. In that role, she led a team of scientists and software engineers to produce and maintain retrieval data products that run operationally at multiple ARM sites, and facilitated communication of scientific priorities between ARM staff and the scientific user community. Dr. Riihimaki earned a bachelor's degree in physics from Wheaton College and a doctorate in physics from the University of Oregon and is an active member of the American Geophysical Union and the American Meteorological Society.
Date/Time: Monday, April 1, 2019 11:00 AM
Location: DSRC GC-402
Title: Using multi-instrument observations of shallow cumulus as a tool for improving simulations of cloud radiative impacts
Abstract
Clouds modulate the surface energy budget in significant ways but are still a challenge for models to simulate accurately at all resolutions. On the climate scale they modulate the energy budget and are the largest source of uncertainty in climate feedbacks to anthropogenic forcing. In high-resolution models, capturing clouds correctly is critical to capture precipitation and meteorology on short time scales, and solar radiation for solar forecasting purposes. In this talk, I will describe multi-instrument approaches to observe shallow cumulus and their radiative effects in order to evaluate and improve climate models as part of two projects. The first project was an effort to develop observations needed to constrain shallow cumulus clouds for the ARM LES ARM Symbiotic Simulation and Observation (LASSO) project. LASSO is developing a library of LES simulations of shallow cumulus evaluated by observations in order to provide the atmospheric science community with. The second project aims to improve the simulation of the variability of surface solar irradiance in weather models for better use in solar forecasting situations. As solar forecasting is particularly challenging in broken clouds, one focus of the project is examining shallow cumulus clouds.


Speaker: Dr. Steve Montzka
Dr. Steve Montzka is a Research Chemist in the Global Monitoring Division at NOAA ESRL. He is the project leader of the Chlorofluorocarbons Alternative Monitoring Project and is responsible for ongoing global atmospheric measurements of approximately 40 chemicals at multiple remote sites across the globe that influence climate, stratospheric ozone, and air quality.
Date/Time: Wednesday, April 24, 2019 03:30 PM
Location: David Skaggs Research Center, GC402 (multi-purpose room)
Title: On science informing international policy: Are emissions of a banned ozone-depleting substance still increasing, and what’s being done about it?
Abstract
Ongoing global-scale measurements of long-lived gases provide unique information for addressing important science and policy-relevant questions. As a recent example, in May of last year we published results suggesting that a country or countries may have recently increased production of an ozone-depleting gas, an apparent contravention of the Montreal Protocol (https://doi.org/10.1038/s41586-018-0106-2). The observational evidence is straightforward: the atmospheric concentration of CFC-11, the second most abundant ozone-depleting gas, is decreasing nearly half as fast as it was 5 years ago, and the slowdown started first in the northern hemisphere. These changes typically indicate increasing emissions, but this unsettling conclusion seemed highly unlikely, given that production of CFC-11 was reportedly banned in 2010. Equally implausible, however, was the alternative conclusion: that global atmospheric chemistry or dynamics had changed and altered the atmospheric decline of CFC-11. In this talk I’ll update the scientific evidence supporting the assertion that CFC-11 emissions and production have increased in recent years and discuss implications for the ozone layer. I’ll also discuss the international responses to this news, which include exhortations by UNEP’s Ozone Secretariat to better understand and resolve this issue as soon as possible, reassessments of the control mechanisms in the Montreal Protocol by its Parties (nations of the world), accusations by independent investigative agencies of extensive use and production in China, China itself conducting extensive in-country searches for use and production of CFC-11 and not finding much, and scientists analyzing new measurements and modeling results in an effort to improve our understanding of the issue and provide a path towards an effective solution.

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