Upcoming Seminars and Presentations

Following are seminars, workshops and other events of interest to GISS staff and to our research partners and that are scheduled during the next 4 months. Please note that due to security regulations, as described at right, presentations on the GISS premises are not open to the general public.

Events marked "Virtual Only" are presented on-line for remote attendance only. Please consult with the event contact/host for connection details.

This event listing was last updated 2020-05-27


Tuesday, May 26, 2020
11:00 a.m. to 12:15 p.m. — Virtual Only
Sea Level Rise Seminar
Topic: Thermal responses to Antarctic ice-shelf melt in a high resolution ocean--sea-ice model
Speaker: Ruth Moorman (Princeton)
More info: Abstract
Host: Craig Rye

Sea Level Rise Seminar
Speaker: Ruth Moorman (Princeton)
Title: Thermal responses to Antarctic ice-shelf melt in a high resolution ocean--sea-ice model


This is an on-line, virtual presentation only. Please consult with event host Craig Rye for connection details.


Abstract:
The implications of ocean freshening from accelerating Antarctic Ice Sheet melt are poorly understood. Coastal freshening may alter abyssal ocean heat storage and the transport of open ocean heat to ice shelf grounding lines, with poorly constrained consequences for further sea-level rise. This talk will outline the results of a recent high-resolution simulation study working towards addressing these uncertainties.

We ran 2 enhanced meltwater simulations using a 0.1deg global ocean-sea-ice model with the aim of identifying thermal responses to Antarctic coastal freshening. Our results point to 3 key mechanisms by which coastal freshening may alter ocean temperatures near ice shelf grounding lines; freshening (1) increases ocean stratification (trapping heat in the subsurface), (2) strengthens the Antarctic Slope Front (limiting heat transport from the open ocean to shelf waters), and (3) accelerates westward circumpolar currents (altering the distribution of heat around the continent). Only one of these responses, increased ocean stratification and subsequent subsurface warming, has been identified in previous experiments using coupled models with comparatively coarse ocean components. In our higher resolution simulations, these 3 mechanisms interplay to generate a spatially variable continental shelf temperature response to freshening, with positive and negative thermal feedbacks to melt dominating different stretches of Antarctic coastline. Off the continental shelf, we find the freshening triggers persistent warming at depth as the formation and export of cold Dense Shelf Water slows. The work highlights the importance of resolving dynamics at the Antarctic shelf margin and representing the full circumpolar domain when simulating interactions and feedbacks between Antarctic land-ice and oceans.


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Tuesday, June 2, 2020
11:00 a.m. to 12:15 p.m. — Virtual Only
Sea Level Rise Seminar
Topic: Spatial and temporal patterns in ice layers in firn in southwest Greenland's percolation zone, 1989-2017
Speaker: Asa Rennermalm (Rutgers)
More info: Abstract
Host: Craig Rye

Sea Level Rise Seminar
Speaker: Asa Rennermalm (Rutgers)
Title: Spatial and temporal patterns in ice layers in firn in southwest Greenland's percolation zone, 1989-2017


This is an on-line, virtual presentation only. Please consult with event host Craig Rye for connection details.


Abstract:
Refreezing of meltwater in firn is a major component of the Greenland ice sheet's mass budget, but in-situ observations are rare. Here, we compare the firn stratigraphy, with a focus on ice layers, of 20 m firn cores extracted at five locations in southwest Greenland in the spring of 2017, and legacy cores extracted at two of the same sites in 1989 and 1998. Between the highest (2355 m a.s.l.) and the lowest site (1963 m a.s.l.), bulk density of the 2017 cores increases from 559 to 732 kg m-3, ice layer mass increases from 15 to 64 % of total mass, and maximum ice layer thickness increases from 0.16 to 1.68 m indicating substantial variations in firn properties with elevation. In contrast, the number of ice layers and depth of the thickest ice layer are not correlated with elevation. Average densities and average and maximum ice layer thicknesses are considerably higher in the 2017 cores compared to the legacy cores. The observed temporal changes are consistent with positive trends in refreezing over the several decades prior to the cores’ extraction, indicating that firn ice content and density are likely to increase with warming climate.


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Tuesday, June 9, 2020
11:00 a.m. to 12:15 p.m. — Virtual Only
Sea Level Rise Seminar
Speaker: Stephen Griffies (Princeton)
Host: Craig Rye
Wednesday, June 10, 2020
1:00 p.m. to 2:00 p.m. — Virtual Only
GISS Lunch Seminar
Topic: Heterogeneous chemistry in the stratosphere in different GISS ModelE configurations
Speaker: Kostas Tsigaridis (GISS/CU)
Host: Clara Orbe
Tuesday, June 16, 2020
11:00 a.m. to 12:15 p.m. — Virtual Only
Sea Level Rise Seminar
Speaker: Haydee Salmun (CUNY)
Host: Craig Rye
Tuesday, June 23, 2020
11:00 a.m. to 12:15 p.m. — Virtual Only
Sea Level Rise Seminar
Speaker: Olga Sergienko (Princeton)
Host: Craig Rye
Tuesday, June 30, 2020
11:00 a.m. to 12:15 p.m. — Virtual Only
Sea Level Rise Seminar
Speaker: Scott Kulp (Climate Central)
Host: Craig Rye
Tuesday, July 7, 2020
11:00 a.m. to 12:15 p.m. — Virtual Only
Sea Level Rise Seminar
Speaker: Alexander Haumann (Princeton)
Host: Craig Rye
Tuesday, July 14, 2020
11:00 a.m. to 12:15 p.m. — Virtual Only
Sea Level Rise Seminar
Speaker: Jianjun Yin (Univ. Arizona)
Host: Craig Rye
Tuesday, July 21, 2020
11:00 a.m. to 12:15 p.m.
Sea Level Rise Seminar
Speaker: James Booth (CUNY)
Host: Craig Rye
Tuesday, July 28, 2020
11:00 a.m. to 12:15 p.m.
Sea Level Rise Seminar
Speaker: Craig Rye (GISS)
Host: Craig Rye
Tuesday, August 4, 2020
11:00 a.m. to 12:15 p.m.
Sea Level Rise Seminar
Speaker: Elizabeth Case (LDEO)
Host: Craig Rye
Tuesday, August 18, 2020
11:00 a.m. to 12:15 p.m.
Sea Level Rise Seminar
Speaker: Nachiketa Acharya (LDEO)
Host: Craig Rye
Tuesday, August 25, 2020
11:00 a.m. to 12:15 p.m.
Sea Level Rise Seminar
Speaker: Samantha Buzzard (Georgia Tech)
Host: Craig Rye
Tuesday, September 1, 2020
11:00 a.m. to 12:15 p.m.
Sea Level Rise Seminar
Speaker: Robert Hailberg (NOAA)
Host: Craig Rye
Tuesday, September 15, 2020
11:00 a.m. to 12:15 p.m.
Sea Level Rise Seminar
Speaker: Davis Holland (NYU)
Host: Craig Rye

Security Note

Regulations require that visitors arrange in advance for a building pass. Persons attending a NASA GISS seminar or colloquium should contact the event host at least two days in advance of the event for assistance. Please include your affiliation in your e-mail.

Due to implementation of the REAL ID Act (2005), a state driver's license or identification card is currently (as of spring 2020) required for admittance to the GISS premises, which is considered a federal facility. However, if you have a state-issued license or ID that is not considered REAL-ID compliant, you are urged to obtain one before entrance regulations change, which is expected to occur in October 2020.

Persons who are not U.S. citizens or U.S. permanent residents and who may be planning a visit to GISS require that special arrangements be made. Please co-ordinate with your GISS host on this at least three weeks before your visit.

All visitors can expect to have their bags searched upon entry to GISS. This may include having to answer questions about personal items, including any medication the visitor may be carrying.