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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.

October 28, 2020

calendar_today Aerosol invigoration of atmospheric convection through increases in humidity

person Lunchtime Seminar - Lunchtime Seminar Series - Tristan Abbot (MIT)

access_time 12:00 pm - 1:00 pm

place Location: Virtual (see event description)

Connection Info: Meeting ID meet.google.com/dua-egje-tqw Phone Numbers(‪US‬)‪+1 617-675-4444‬ PIN: ‪315 432 135 3495#‬ Abstract:Cloud-aerosol interactions remain a major obstacle to understanding climate and severe weather. Observations suggest that aerosols enhance tropical thunderstorm activity; past research, motivated by the importance of understanding aerosol impacts on clouds, has proposed several mechanisms that could explain that observed link. Here, we show that cloud-resolving models run under the weak temperature gradient approximation can reproduce the observed link between aerosols and convection. However, we also show that previously-proposed mechanisms are unable to explain the invigoration. Examining underlying processes reveals that, in our simulations, high aerosol concentrations increase environmental humidity by producing clouds that mix more condensed water into the surrounding air. In turn, higher humidity favors large-scale ascent and stronger convection. Scale analysis of the effects of humidity on the temperature of entraining plumes, as compared to the effects of fusion of cloud water, further supports our finding that cloud-environment interactions can play a major role in altering updraft properties. Overall, our results provide a novel physical reason to expect invigorated thunderstorms in high-aerosol regions of the tropics.

October 29, 2020

calendar_today Quantifying the role that terrestrial ecosystems play in Earth's climate

person Formal Seminar (approved) - Formal Seminar - Abigail Swann (University of Washington)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Connection Information: Meeting ID meet.google.com/opy-qpcz-tqj Phone Numbers‪ US‪+1 617-675-4444‬ PIN: ‪832 084 430 6763#‬ Abstract: Biologists have widely documented how the local environment influences plants. Recent findings suggest, surprisingly, that the reverse is also true: plant distribution and functioning control the local energy balance at Earth's surface and directly modify regional and global scale climate. In this talk I will discuss how plants modify the climate system and its response to external forcing. We will investigate the sensitivity of the atmosphere to changes in plant cover, in particular the location of plant cover change. We will also explore the role that plant responses to a changing climate can further modify climate. Taken together, these findings demonstrate that ecosystems and climate must be considered together as a coupled system, particularly when assessing the response of the climate system to change.

November 5, 2020

calendar_today To Be Provided

person Formal Seminar (approved) - Formal Seminar - Fiamma Straneo (Scripps Institution of Oceanography, UCSD)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Abstract To be Provided Connection Information: Meeting ID meet.google.com/avn-vhbs-xtr Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪944 337 162 8775#‬

November 12, 2020

calendar_today The interaction of tropical convection with its environment - insights from long-term radar observations

person Formal Seminar (approved) - Formal Seminar - Christian Jakob

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Connection Information: Meeting ID meet.google.com/qii-brxn-fac Phone Numbers (‪US‬) ‪+1 617-675-4444‬ Abstract The faithful representation of tropical convection in weather and climate models remains one of most difficult tasks in atmospheric science. This is so, because the complex interactions of small-, meso- and large-scale processes that occur in convection need to be parametrized in those models. Much of the recent work in understanding the behavior of convection and in improving parametrizations has utilized high-resolution cloud models, with often only tenuous connections back to observations. This talk aims to illustrate the vastly underestimated potential of modern observations to inform understanding and parametrization. Since the 1990s, a research radar network around Darwin in tropical Australia has been instrumental in significantly improving our understanding of the scale interactions associated with tropical convection. Its use has culminated in a unique, 16-year long data set for atmospheric convection research. We use this data set to examine the key ingredients of tropical convective cloud ensembles, such as cloud number, size, depth and in-cloud vertical motion and their relationship to the large-scale state of the atmosphere. We show that convective heating in an area is largely dominated by the fraction of the area that experiences convection. We show that the most intense convection is associated with large clouds that occur in a dry and often descending atmosphere, while the largest area-average rain results from a moderate number of moderate size clouds embedded in a humid and ascending atmosphere. Combining cloud-structure information with radar-based estimates of in-cloud vertical velocity, enables us to estimate convective mass-fluxes over long periods of time and large areas. We use this information to estimate the vertical structure of entrainment and detrainment and its relationship to the convective environment. Finally, we briefly highlight how the inspiration drawn from the observations can be used to design innovative approaches to cumulus parametrization.

November 19, 2020

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Benjamin Poulter (NASA/GSFC)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Abstract To Be provided by Host: Elena Shevliakova Connection information: Meeting ID meet.google.com/tvj-puvq-rxr Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪873 391 702 7311#‬

December 3, 2020

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Anthony Didlake (Penn State University)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Abstract To Be Provided by Sponsor: Steve Garner Connection Information: Meeting ID meet.google.com/oqr-fnza-xcd Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪840 119 473 3945#‬

December 10, 2020

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Fleur Couvreux (Centre National de Recherches Météorologiques (CNRM))

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Connection Info: Meeting ID meet.google.com/jax-nogo-zkz Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪763 973 282 8298#‬

December 17, 2020

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Marie Dumont (CNRM (UMR CNRS* Meteo-France))

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Connection Info: Meeting ID meet.google.com/zbv-hqmb-feq Phone Numbers(‪US‬)‪+1 617-675-4444‬ PIN: ‪925 053 078 0368#‬

January 7, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Susan Wijffels (Woods Hole, MA)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Abstract To Be provided by Host: Stephen Griffies Connection Information Meeting ID meet.google.com/phb-dnqs-iro Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪460 667 189 0435#‬

January 21, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Earle Wilson (CalTech)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Connection Info: Meeting ID meet.google.com/heh-jtvt-kxs Phone Numbers(‪US‬)‪+1 617-675-4444‬ PIN: ‪709 241 879 2400#‬

January 27, 2021

calendar_today The Sensitivity of the U.S. Economy to Seasonal Outlooks

person Lunchtime Seminar - Lunchtime Seminar Series - Sarah Kapnick (GFDL)

access_time 12:00 pm - 1:00 pm

place Location: Virtual (see event description)

TBP

January 28, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Alberto Arribas (UK Met Office)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Abstract To Be Provided by Host: V. Balaji Connection Information: Meeting ID meet.google.com/hfx-ntvp-ied Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪846 530 697 4157#‬

February 4, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Steven Sherwood (Climate Change Research Centre (CCRC) - The University of New South Wales Sydney)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Connection Info: Meeting ID meet.google.com/rvw-hkmu-gpk Phone Numbers(‪US‬)‪+1 617-675-4444‬ PIN: ‪127 734 066 6282#‬

February 11, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Kerry Cook (Univ. of Texas-Austin)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

To Be Announced

February 18, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Susan van den Heever (Colorado State University)

access_time 2:00 pm - 3:00 pm

place Location: Smagorinsky Seminar Room

Abstract To Be Provided by: Yi Ming Connection Information: Meeting ID meet.google.com/gfj-pkcr-qku Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪337 359 798 8291#

February 25, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Stephen Belcher (UK Met Office)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Abstract To Be Provided by Sponsor: Brandon Reichel Connection Information: Meeting ID meet.google.com/yjy-kfzf-htj Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪683 199 380 7457#‬

March 4, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Noel Keenlyside (Bjerknes Center for Climate Research)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Connection Info: Meeting ID meet.google.com/gmf-pmnw-wrb Phone Numbers(‪US‬)‪+1 617-675-4444‬ PIN: ‪198 039 397 3555#‬ Abstract:

March 11, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Reto Knutti (ETH Zurich, Dept of Environmental Systems Science)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Connection Info: Meeting ID meet.google.com/iuo-czuo-hgx Phone Numbers(‪US‬)‪+1 617-675-4444‬ PIN: ‪615 747 218 0234#‬

March 18, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Samantha Siedlecki (University of Connecticut)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Connection Info: Meeting ID meet.google.com/yja-qwkt-myo Phone Numbers (‪US‬)‪+1 617-675-4444‬ PIN: ‪605 262 098 4225#‬

March 25, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Adrienne Sutton (PMEL)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Meeting ID meet.google.com/opf-smxs-qew Phone Numbers(‪US‬)‪+1 617-675-4444‬ PIN: ‪161 957 973 6622#‬

April 1, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Pamela Heinselman (Norman, OK)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Abstract To Be Provided by Host: Ram Connection Information: Meeting ID meet.google.com/jpc-nwjy-jsp Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪567 604 034 4826#‬

April 8, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - John Dabiri

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Abstract To Be Provided by Host: Bob Hallberg. Connection Information: Meeting ID meet.google.com/nyk-kyms-yyb Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪153 792 963 8670#‬

April 15, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Dick Dee (UCAR/Joint Center for Satellite Data Assimilation)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Meeting ID meet.google.com/ecg-nyuu-aji Phone Numbers(‪US‬)‪+1 617-675-4444‬ PIN: ‪616 036 931 2300#‬ Abstract:

April 22, 2021

calendar_today TBD

person Formal Seminar (approved) - Formal Seminar - Sarah Purkey (Scripts Institute Oceanography - Colorado State University)

access_time 2:00 pm - 3:00 pm

place Location: Virtual (see event description)

Communication information: Meeting ID meet.google.com/bcx-qwhi-gpe Phone Numbers (‪US‬) ‪+1 617-675-4444‬ PIN: ‪295 554 861 7686#‬