[Grad-postdoc-assn] Fwd: ATOC Colloquium: Friday, October 16 from 11a–12p featuring Hannah Zanowski, Dillon Amaya, and Jen Kay

Mon Oct 12 07:57:23 MDT 2020

FYI

---------- Forwarded message ---------
From: atoc-colloquium (Andrew Winters) <atoc-colloquium at lists.colorado.edu>
Date: Mon, Oct 12, 2020 at 7:50 AM
Subject: ATOC Colloquium: Friday, October 16 from 11a–12p featuring Hannah
Zanowski, Dillon Amaya, and Jen Kay
To: atoc-faculty at lists.colorado.edu <atoc-faculty at lists.colorado.edu>,
atoc-minors at lists.colorado.edu <atoc-minors at lists.colorado.edu>,
atoc-majors at lists.colorado.edu <atoc-majors at lists.colorado.edu>,
atoc-students at lists.colorado.edu <atoc-students at lists.colorado.edu>,
atoc-researchers at lists.colorado.edu <atoc-researchers at lists.colorado.edu>,
atoc-colloquium at lists.colorado.edu <atoc-colloquium at lists.colorado.edu>

Hi everyone,

The next ATOC Colloquium will be held on *Friday, October 16 from 11am–12pm
via Zoom* and will feature * Hannah Zanowski (ATOC/INSTAAR), Dillon Amaya
(ATOC/CIRES)*, and *Jen Kay (ATOC/CIRES). *Please find the titles,
abstracts, and Zoom information for each talk below.

Join us for coffee starting at 10:45am as well as a virtual lunch following
the seminar to facilitate follow-up discussions. You can find complete
information about the colloquium, and the schedule for the semester, on the
ATOC Colloquium webpage (https://www.colorado.edu/atoc/colloquium).

Please let us know if you have any questions or are interested in
delivering a talk at a future colloquium.

We look forward to seeing you on October 16!

The ATOC Colloquium Committee

_________________________________________________

*Arctic Freshwater Storage and Export in CMIP6 Models *
Hannah Zanowski (ATOC/INSTAAR)

We analyze Arctic freshwater storage and fluxes in 7 climate models from
the Coupled Model Intercomparison Project phase 6 (CMIP6) over the
historical period (1980-2000) and in two future emissions scenarios,
SSP1-2.6 and SSP5-8.5. In both future scenarios the models show an increase
in liquid (ocean) freshwater storage in conjunction with a reduction in
solid storage and fluxes through the major Arctic gateways (Bering Strait,
Fram Strait, Davis Strait, and the Barents Sea Opening) that is typically
larger for SSP5-8.5 than SSP1-2.6. The liquid fluxes through the gateways
exhibit a more complex pattern, with models showing a change in sign of the
freshwater flux through the Barents Sea Opening and little change in the
flux through the Bering Strait in addition to increased export from the
remaining straits. Although the models broadly agree on the sign of future
storage and flux changes, substantial differences exist between the
magnitude of these changes and the models’ Arctic mean states.

*Are Long-Term Changes in Mixed Layer Depth Influencing North Pacific
Marine Heatwaves?*
Dillon Amaya (ATOC/CIRES)

Climate model projections indicate that upper ocean stratification is
expected to increase in response to continued greenhouse gas warming,
shoaling the mean mixed layer depth (MLD) throughout much of the globe.
Long-term shoaling of the mean MLD would result in a stronger ocean
temperature response for the same surface heat flux forcing. This has
significant implications for the likelihood and intensity of ocean
temperature extremes (i.e., marine heatwaves) and their potential impacts
on sensitive marine ecosystems. In this study, we investigate the influence
of long-term MLD shoaling on marine heatwaves in the observational record
and in future climate model projections, with a particular focus on the
Northeast Pacific. We find that recent marine heatwaves, such as the summer
2019 Blob 2.0, and their impacts were likely amplified by multi-decadal
shoaling of the mixed layer since 1980.

*Quantifying the Influence of Cloud Radiative Feedbacks on Arctic Surface
Warming using Cloud Locking in an Earth System Model*
Jen Kay (ATOC/CIRES) on behalf of Eleanor Middlemas

Understanding the influence of clouds on amplified Arctic surface warming
remains an important unsolved research problem. Here, this cloud influence
is directly quantified by disabling cloud radiative feedbacks or “cloud
locking” within a state‐of‐the‐art and well‐documented model. Through
comparison of idealized greenhouse warming experiments with and without
cloud locking, the influence of Arctic and global cloud feedbacks is
assessed. Global cloud feedbacks increase both global and Arctic warming by
around 25%. In contrast, disabling Arctic cloud feedbacks has a negligible
influence on both Arctic and global surface warming. Interestingly, the sum
of noncloud radiative feedbacks does not change with either global or
Arctic‐only cloud locking. Notably, the influence of Arctic cloud feedbacks
is likely underestimated, because, like many models, the model used here
underestimates high‐latitude supercooled cloud liquid. More broadly, this
work demonstrates the value of regional and global cloud locking in a
well‐characterized model.
______________________________________________________

*Zoom information:*

*Topic: ATOC Colloquium October 16*
*Time: Oct 16, 2020 11:00 AM Mountain Time (US and Canada)*

*Join Zoom Meeting*
*https://cuboulder.zoom.us/j/96833281435
<https://cuboulder.zoom.us/j/96833281435>*

*Meeting ID: 968 3328 1435*
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_______________________________________________________

*Andrew C. Winters*
Assistant Professor
Department of Atmospheric and Oceanic Sciences (ATOC)
University of Colorado Boulder
311 UCB, Boulder, CO 80309-0311
Office: SEEC C277 || Phone: 303-735-5775
https://acwinters.weebly.com || @acwinters_wx || he/him/his

-- 
Scott Briggs
Administrator
Advanced Study Program
National Center For Atmospheric Research
303.497.1607

*1. You are not working from home, you are at home, during a pandemic,
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