<div dir="ltr"><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Jessica Badgeley is a finalist for the APL Science + Engineering Enrichment + Development (SEED) Postdoctoral
Fellowship and will be giving a seminar on Monday March 25th at 10am in the APL Henderson Hall Commons.
The
Henderson Hall commons are open to anyone at UW, no badge required. The
Eastern doorway to Handerson will be open from 9:30 am onward and the Commons are just to
your right when you walk in the building. Feel free to contact me with
access questions. Refreshments (coffee and pastries) will be served prior to the seminar -- please come socialize before the seminar.
<div dir="ltr"><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">
<font size="2"><b><span style="font-family:"Times New Roman",serif">Title: Seasonality in ice-flow dynamics of Greenland outlet
glaciers: Impact on ice sheet mass balance at present and in the future</span></b></font> <br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">
<p class="MsoNormal" style="text-align:justify;margin:0in;font-family:"Aptos",sans-serif"><font size="2"><span style="font-family:"Times New Roman",serif"><span></span></span></font></p><p class="MsoNormal" style="text-align:justify;margin:0in;font-family:"Aptos",sans-serif"><font size="2"><span style="font-family:"Times New Roman",serif"><span><b>Time/location: Monday March 25, 10am. Henderson Commons <br></b></span></span></font></p><p class="MsoNormal" style="text-align:justify;margin:0in;font-family:"Aptos",sans-serif"><font size="2"><span style="font-family:"Times New Roman",serif"><span><b><br></b></span></span></font></p><p class="MsoNormal" style="text-align:justify;margin:0in;font-family:"Aptos",sans-serif"><font size="2"><span style="font-family:"Times New Roman",serif"><span><b>Remote option: Live zoom link to follow</b></span></span></font></p><p class="MsoNormal" style="text-align:justify;margin:0in;font-family:"Aptos",sans-serif"><font size="2"><span style="font-family:"Times New Roman",serif"><span><b><br></b></span></span></font></p><p class="MsoNormal" style="text-align:justify;margin:0in;font-family:"Aptos",sans-serif">
</p><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><span style="font-family:"Times New Roman",serif"><font size="2"><b>Abstract:</b> State-of-the-art
ice sheet model simulations used in the Ice Sheet Model Intercomparison Project
(ISMIP) are inconsistent with recent observations of ice sheet change. For
Greenland, models tend to underestimate the observed cumulative mass balance
over the last several decades, calling into question the accuracy of current
projections of the ice sheet’s contribution to sea level rise. Most models only
resolve ice dynamics at annual to coarser resolution, and therefore s</font><span><font size="2">easonal variability in outlet glacier flow may be
an unresolved critical driver of present and future mass balance of the
Greenland Ice Sheet and a remaining source of the model-observation discrepancy.
Previous research that has examined seasonal glacier dynamics in Greenland
shows that both ice front positions and subglacial hydrology determine sub-annual
dynamic variability. Studies that relate these variables, however, rely on
idealized models, observations only, or are limited to individual or small
samples of glaciers. These caveats have made it challenging to quantify causal
linkages between processes and seasonal glacier dynamics and have limited our
understanding of how this seasonality will impact the net mass balance of
glaciers and the ice sheet in the future. In this talk, I will discuss current
and proposed work that uses a transient data assimilation approach to constrain
a spatially and temporally complete accounting of the dominant drivers of Greenland
outlet glacier seasonality. With these data-constrained model results, I will
show how dynamic seasonality impacted historical ice sheet mass balance. Projecting
future impacts of seasonal ice dynamics, however, will require creating
parameterizations of these processes. I will work towards parameterizations by
first using my numerical model results along with dense observations to understand
which environmental and geometric factors determine the spatiotemporal
variability of seasonal dynamic drivers. In addition, the model-data
integration framework developed during this project will naturally extend to
other transient ice dynamic questions for both the Greenland and Antarctic ice
sheets. </font></span></span></div>
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