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GFDL Events & Seminars

Visitors without GFDL affiliation attending seminars or other organized events must present government or university issued photo ID or two other forms of identification to gain access to the facility. If an acceptable ID cannot be provided, the Visitor will not be allowed access. If access is granted, the Visitor must sign in and be given a Visitor Badge. The Visitor Badge expires immediately after the seminar.

April 24, 2019

calendar_today 'Southern Ocean Winds' Comes to the Tropics

person Lunchtime Seminar - J. R. Toggweiler (GFDL)

access_time 12:00 pm - 1:00 pm

place Location: Smagorinsky Seminar Room

TBD

May 1, 2019

calendar_today Simulations of aerosol over the Indian region

person Lunchtime Seminar - Lunchtime Seminar Series - Gaurav Govardhan (GFDL)

access_time 12:00 pm - 1:00 pm

place Location: Smagorinsky Seminar Room

Aerosols affect climate by scattering and absorbing atmospheric radiation. In this study, upon evaluation of aerosol simulating regional and global chemistry transport models (WRF-Chem, SPRINTARS and HadGEM) over the Indian region, we find that the models underestimate mass concentration of Black Carbon (BC) aerosol by a large margin and the corresponding BC emissions appear to be the primary cause for it. The Aerosol Optical Depths (AOD) also appear to be unrealistic. The possible role of state of mixing of BC on such AOD simulations has been examined. It is found with the help of an offline model constrained by observations of aerosol particles (using a scanning electron microscope) that, the effects of realistic state of mixing of BC on AOD and related forcing are lesser than previously thought. Lastly, we examine the vertical profile of BC from model simulations and find that the model captures the observed sharp elevated layers of BC only after the prescription of BC emissions from aircraft. The analysis of model simulations and space-based LIDAR data shows that such BC layers can get vertically transported further up upon their interaction with the underlying strong monsoonal convection. Such lifted BC layers can potentially have severe climatic implications. Host: Dr. Ram

May 2, 2019

calendar_today Making Climate Model Outputs Useful for the Water Resources Community

person Formal Seminar (approved) - Formal Seminar - Ethan Gutmann (Research Applications Lab, NCAR)

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

The water resource sector is one of those most likely to experience significant effects from climate change; however, water resource managers are unable to directly use the output from climate models to inform their planning. Such models do not adequately represent important hydroclimate phenomena; most notably, the effect of regional mountain ranges on precipitation and temperature is not resolved. As a result, water managers have turned to simplistic statistical downscaling methods, though these methods may not represent the physical processes any better than the global model. Even regional climate models (RCMs) have too great a computational cost at the spatial resolutions desired. Here we present a new modeling approach, the Intermediate Complexity Atmospheric Research model (ICAR) developed to represent processes important for water resources, particularly orographic effects. ICAR uses an analytical solution for flow over topography to adjust the large scale wind field; this is used to advect heat and moisture through the domain while calculating the same physical processes that a traditional RCM would (e.g. cloud microphysics and land surface feedbacks.) Because of its simplifying assumptions, ICAR is capable of running 100-1000 times faster than a traditional RCM, while still reproducing key facets of the regional climate. In addition, we can use ICAR to explore some of the, often ignored, uncertainties within regional and global climate modeling including the strength of the snow-albedo feedback effect and the variability in cloud microphysical parameters. Host: Keith Dixon.

May 8, 2019

calendar_today GFDL Poster Expo

person Special Event - GFDL Poster Expo

access_time 1:00 pm - 4:00 pm

place Location: Smagorinsky Seminar Room

GFDL Poster Expo

May 10, 2019

calendar_today Sarah Schlunegger FPO

person Informal Seminar - Sarah Schlunegger FPO

access_time 10:30 am - 12:00 pm

place Location: Smagorinsky Seminar Room

Sarah Schlunegger FPO Jorge Sormiento

May 15, 2019

calendar_today Metamodels and supermodels

person Lunchtime Seminar - Lunchtime Seminar Series - V. Balaji (NOAA/GFDL and Princeton University)

access_time 12:00 pm - 1:00 pm

place Location: Smagorinsky Seminar Room

In this talk, we examine approaches to Earth system modeling in the post-Dennard era, inspired by the industry trend toward machine learning (ML). ML presents a number of promising pathways, but there remain challenges specific to introducing ML into multi-phase multi-physics modeling. A particular aspect of such 'multi-scale multi-physics' models that is under-appreciated is that they are built using a combination of local process-level and global system-level observational constraints, for which the calibration process itself remains a substantial computational challenge. These include, among others: the non-stationary and chaotic nature of climate time series; the presence of climate subsystems where the underlying physical laws are not completely known; and the imperfect calibration process alluded to above. The talk will present ideas and challenges and the future of Earth system models as we prepare for a post-Dennard future, where learning methods are poised to play an increasingly important role.

May 21, 2019

calendar_today TBD

person Lunchtime Seminar - Informal Seminar Series Melanie Bieli (Columbia University)

access_time 10:30 am - 11:30 am

place Location: Smagorinsky Seminar Room

TBD

May 22, 2019

calendar_today TBD

person Lunchtime Seminar - Lunchtime Seminar Series - Linjiong Zhou (Princeton University-GFDL)

access_time 12:00 pm - 1:00 pm

place Location: Smagorinsky Seminar Room

TBD

June 12, 2019

calendar_today Forecasting estuarine temperature, salinity, and oxygen

person Lunchtime Seminar - Lunchtime Seminar Series - Andrew Ross (GFDL)

access_time 12:00 pm - 1:00 pm

place Location: Smagorinsky Seminar Room

To Be Provided

June 20, 2019

calendar_today Ocean modelling for seamless prediction

person Formal Seminar (approved) - Formal Seminar - Helen Hewett (UK Met Office)

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

Ocean model configurations developed by the Met Office (and partners) are utilised for applications from short-range ocean forecasting to climate projections (‘seamless prediction’). The opportunities as well as the challenges and conflicting requirements of the seamless approach are described. The choice of ocean model resolution is discussed including the need to provide evidence to support the additional computational and storage costs of higher resolution. Alongside enhanced resolution, improved process representation in the model configurations is also a target and current efforts to improve overflows and convection are described.

July 24, 2019

calendar_today Tropical Atmospheric Madden-Julian Oscillation

person Lunchtime Seminar - Lunchtime Seminar Series - Jun-Ichi Yano (Meteo France, Toulouse)

access_time 12:00 pm - 1:00 pm

place Location: Smagorinsky Seminar Room

The Madden-Julian oscillation (MJO), a planetary-scale eastward propagating coherent structure with periods of 30-60 days, is a prominent manifestation of intraseasonal variability in the tropical atmosphere. It is widely presumed that small-scale moist cumulus convection is a critical part of its dynamics. However, the recent results from high-resolution modeling as well as data analysis suggest that the MJO may be understood by dry dynamics to a leading-order approximation. Simple, further theoretical considerations presented herein suggest that if it is to be understood by dry dynamics, the MJO is most likely a strongly nonlinear solitary Rossby wave. Under a global quasi--geostrophic equivalent-barotropic formulation, modon theory provides such analytic solutions. Stability and the longevity of the modon solutions are investigated with a global shallow water model. The preferred modon solutions with the greatest longevities compare overall well with the observed MJO in scale and phase velocity within the factors. Host: Leo Donner

August 5, 2019

calendar_today Xin Rong Chua-FPO

person Informal Seminar - Xin Rong Chua-FPO

access_time 10:00 am - 12:00 pm

place Location: Smagorinsky Seminar Room

Xin Rong Chua-FPO

August 12, 2019

calendar_today Spencer Clark - FPO

person Informal Seminar - Spencer Clark - FPO

access_time 10:00 am - 12:00 pm

place Location: Smagorinsky Seminar Room

Spencer Clark - FPO

September 5, 2019

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

TBD

September 12, 2019

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

TBD

September 19, 2019

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

TBD

September 26, 2019

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

TBD

October 3, 2019

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

TBD

October 10, 2019

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

TBD

October 17, 2019

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

TBD