[Grad-postdoc-assn] Fwd: ATOC Colloquium: Friday, Feb. 10 @ 11am MT – Clairy Reiher, Cole Persch, and Tessa Gorte (SEEC S228 and Zoom)
Scott Briggs
sbriggs at ucar.edu
Thu Feb 9 07:54:46 MST 2023
Happening tomorrow.
---------- Forwarded message ---------
From: atoc-colloquium (Andrew Winters) <atoc-colloquium at lists.colorado.edu>
Date: Thu, Feb 9, 2023 at 7:37 AM
Subject: Re: ATOC Colloquium: Friday, Feb. 10 @ 11am MT – Clairy Reiher,
Cole Persch, and Tessa Gorte (SEEC S228 and Zoom)
To: Atoc-majors at lists.colorado.edu <atoc-majors at lists.colorado.edu>,
Atoc-minors at lists.colorado.edu <atoc-minors at lists.colorado.edu>,
atoc-students (Julie Lundquist) <atoc-students at lists.colorado.edu>,
atoc-faculty (Alexandra Jahn) <atoc-faculty at lists.colorado.edu>,
atoc-researchers (Kelly Duong) <atoc-researchers at lists.colorado.edu>,
atoc-colloquium at lists.colorado.edu <atoc-colloquium at lists.colorado.edu>,
Andrew Winters <andrew.c.winters at colorado.edu>
Hi everyone,
A reminder that the next ATOC colloquium will be held on *Friday, February
10 at 11am MT over Zoom and in SEEC S228*. This week's colloquium will
feature a trio of conference-length talks from *ATOC graduate students,
Clairy Reiher, Cole Persch, and Tessa Gorte*.* The zoom login information
and abstracts for each talk are provided below. Please join us for coffee
and conversation beginning at 10:45am MT and stay afterwards for a lunch
catered by Illegal Pete's.*
We look forward to seeing you tomorrow!
-The ATOC Colloquium Committee
_________________________________________________
*An Analysis of North American Polar-Subtropical Jet Superpositions that
Coincide with High-Impact Weather Events*
Clairy Reiher (ATOC)
A vertical superposition of the polar and subtropical jet streams
constitutes a unique synoptic-scale environment with the potential to
induce high-impact weather, including anomalously strong surface cyclones
that are accompanied by heavy precipitation and strong winds. In this
study, we pair a climatology of jet superpositions with climatologies of
atmospheric rivers and surface cyclones to determine the frequency with
which these features accompany jet superpositions. We subsequently use the
association of surface cyclones and atmospheric rivers with jet
superpositions to construct two subsets of jet superpositions: a set of
“high-impact” events that are likely to induce high-impact weather, and a
set of “null” events that are unlikely to induce high-impact weather.
Composite analyses are then performed to identify discriminating
environmental factors between high-impact and null events, and how these
factors influence jet superposition dynamics.
*The Impact of Orbital Precession on Carbon Flux in the Southern Ocean*
Cole Persch (ATOC)
Orbital precession has been statistically linked to glacial cycles via its
influence on the cryosphere, but its direct impact on the atmospheric CO2
record is less well-known. The Southern Ocean is an important driver of
atmospheric CO2 due to its rapid carbon outgassing and has been shown to
respond to precession. This work seeks to test for a link between
precession and carbon outgassing in the Southern Ocean that would explain
the 21 kyr power found in the historical atmospheric CO2 record. A set of
Earth System Models have been run with different orbital parameters to
isolate the impact of precession on carbon outgassing in the Southern
Ocean. Setting the Northern-Hemisphere winter solstice to occur at the
perihelion of Earth's orbit results in enhanced carbon outgassing in the
Southern Ocean due to the Southern Hemisphere Westerlies shifting poleward.
*Antarctic Ice Sheet Discharge Drives Large Scale Southern Ocean
Circulation Changes*
Tessa Gorte (ATOC)
Multidecadal satellite observations indicate that the Antarctic Ice Sheet
is losing mass at an accelerating rate. Containing enough water in the form
of ice to raise global mean sea level by nearly 70 m, capturing this rapid
mass loss is crucial for accurately modelling our global climate system;
however most models fail to do so for lack of an active ice sheet component
for Antarctica. In this project, we create two simulations using the
Community Earth System Model version 2 -- one with constant freshwater
discharge from the AIS and one with an AIS freshwater forcing that mimics
findings from satellite observations -- to explore the potential impacts of
pseudo-realistic AIS mass loss both locally and globally. We find that the
increased AIS freshwater discharge has extensive impacts on the Southern
Ocean; affecting the temperature and density structure of the internal
ocean as well as engendering changes to the ocean-atmosphere heat flux over
the course of the 21st century.
__________________________________________________
*Zoom login Information:*
*Topic: ATOC Colloquium*
*Time: Friday, Feb. 10 at 11am MT*
*Join Zoom Meeting*
*https://cuboulder.zoom.us/j/97845417945
<https://cuboulder.zoom.us/j/97845417945>*
*Meeting ID: 978 4541 7945 *
*Passcode: ATOC*
One tap mobile
+17193594580,,97845417945# US
+16699006833,,97845417945# US (San Jose)
Dial by your location
+1 719 359 4580 US
+1 669 900 6833 US (San Jose)
+1 253 215 8782 US (Tacoma)
+1 346 248 7799 US (Houston)
+1 669 444 9171 US
+1 646 558 8656 US (New York)
+1 646 931 3860 US
+1 301 715 8592 US (Washington DC)
+1 309 205 3325 US
+1 312 626 6799 US (Chicago)
+1 386 347 5053 US
+1 564 217 2000 US
Meeting ID: 978 4541 7945
Find your local number: https://cuboulder.zoom.us/u/acegj8GnMV
Join by SIP
97845417945 at zoomcrc.com
Join by H.323
162.255.37.11 (US West)
162.255.36.11 (US East)
115.114.131.7 (India Mumbai)
115.114.115.7 (India Hyderabad)
213.19.144.110 (Amsterdam Netherlands)
213.244.140.110 (Germany)
103.122.166.55 (Australia Sydney)
103.122.167.55 (Australia Melbourne)
149.137.40.110 (Singapore)
64.211.144.160 (Brazil)
149.137.68.253 (Mexico)
69.174.57.160 (Canada Toronto)
65.39.152.160 (Canada Vancouver)
207.226.132.110 (Japan Tokyo)
149.137.24.110 (Japan Osaka)
Meeting ID: 978 4541 7945
Passcode: 432312
_______________________________________________________
*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
*CU Boulder acknowledges that it is located on the traditional territories
and ancestral homelands of the Cheyenne, Arapaho, Ute and many other Native
American nations. Their forced removal from these territories has caused
devastating and lasting impacts. Full CU Boulder land acknowledgment
<https://www.colorado.edu/about/land-acknowledgement> *
------------------------------
*From:* atoc-faculty-request at lists.colorado.edu <
atoc-faculty-request at lists.colorado.edu> on behalf of atoc-faculty (Andrew
Winters) <atoc-faculty at lists.colorado.edu>
*Sent:* Monday, February 6, 2023 4:03 PM
*To:* Atoc-majors at lists.colorado.edu <atoc-majors at lists.colorado.edu>;
Atoc-minors at lists.colorado.edu <atoc-minors at lists.colorado.edu>;
atoc-students (Julie Lundquist) <atoc-students at lists.colorado.edu>;
atoc-faculty (Alexandra Jahn) <atoc-faculty at lists.colorado.edu>;
atoc-researchers (Kelly Duong) <atoc-researchers at lists.colorado.edu>;
atoc-colloquium at lists.colorado.edu <atoc-colloquium at lists.colorado.edu>
*Subject:* ATOC Colloquium: Friday, Feb. 10 @ 11am MT – Clairy Reiher, Cole
Persch, and Tessa Gorte (SEEC S228 and Zoom)
Hi everyone,
The next ATOC Colloquium will be held in a hybrid format on *Friday,
February 10 from 11a–12p MT over Zoom and in SEEC S228. *This week's
colloquium will feature a trio of conference-length talks from *ATOC
graduate students, Clairy Reiher, Cole Persch, and Tessa Gorte.* The zoom
login information and abstracts for each talk are provided below. Please
join us for coffee and conversation beginning at 10:45am MT, and stay
afterwards for a lunch catered by Illegal Pete's.
Please let us know if you have any questions or are interested in
delivering a talk at a future colloquium. A full schedule of ATOC colloquia
can be found at https://www.colorado.edu/atoc/colloquium.
We look forward to seeing you on Feb. 10!
-The ATOC Colloquium Committee
_________________________________________________
*An Analysis of North American Polar-Subtropical Jet Superpositions that
Coincide with High-Impact Weather Events*
Clairy Reiher (ATOC)
A vertical superposition of the polar and subtropical jet streams
constitutes a unique synoptic-scale environment with the potential to
induce high-impact weather, including anomalously strong surface cyclones
that are accompanied by heavy precipitation and strong winds. In this
study, we pair a climatology of jet superpositions with climatologies of
atmospheric rivers and surface cyclones to determine the frequency with
which these features accompany jet superpositions. We subsequently use the
association of surface cyclones and atmospheric rivers with jet
superpositions to construct two subsets of jet superpositions: a set of
“high-impact” events that are likely to induce high-impact weather, and a
set of “null” events that are unlikely to induce high-impact weather.
Composite analyses are then performed to identify discriminating
environmental factors between high-impact and null events, and how these
factors influence jet superposition dynamics.
*The Impact of Orbital Precession on Carbon Flux in the Southern Ocean*
Cole Persch (ATOC)
Orbital precession has been statistically linked to glacial cycles via its
influence on the cryosphere, but its direct impact on the atmospheric CO2
record is less well-known. The Southern Ocean is an important driver of
atmospheric CO2 due to its rapid carbon outgassing and has been shown to
respond to precession. This work seeks to test for a link between
precession and carbon outgassing in the Southern Ocean that would explain
the 21 kyr power found in the historical atmospheric CO2 record. A set of
Earth System Models have been run with different orbital parameters to
isolate the impact of precession on carbon outgassing in the Southern
Ocean. Setting the Northern-Hemisphere winter solstice to occur at the
perihelion of Earth's orbit results in enhanced carbon outgassing in the
Southern Ocean due to the Southern Hemisphere Westerlies shifting poleward.
*Antarctic Ice Sheet Discharge Drives Large Scale Southern Ocean
Circulation Changes*
Tessa Gorte (ATOC)
Multidecadal satellite observations indicate that the Antarctic Ice Sheet
is losing mass at an accelerating rate. Containing enough water in the form
of ice to raise global mean sea level by nearly 70 m, capturing this rapid
mass loss is crucial for accurately modelling our global climate system;
however most models fail to do so for lack of an active ice sheet component
for Antarctica. In this project, we create two simulations using the
Community Earth System Model version 2 -- one with constant freshwater
discharge from the AIS and one with an AIS freshwater forcing that mimics
findings from satellite observations -- to explore the potential impacts of
pseudo-realistic AIS mass loss both locally and globally. We find that the
increased AIS freshwater discharge has extensive impacts on the Southern
Ocean; affecting the temperature and density structure of the internal
ocean as well as engendering changes to the ocean-atmosphere heat flux over
the course of the 21st century.
__________________________________________________
*Zoom login Information:*
*Topic: ATOC Colloquium*
*Time: Friday, Feb. 10 at 11am MT*
*Join Zoom Meeting*
*https://cuboulder.zoom.us/j/97845417945
<https://cuboulder.zoom.us/j/97845417945>*
*Meeting ID: 978 4541 7945 *
*Passcode: ATOC*
One tap mobile
+17193594580,,97845417945# US
+16699006833,,97845417945# US (San Jose)
Dial by your location
+1 719 359 4580 US
+1 669 900 6833 US (San Jose)
+1 253 215 8782 US (Tacoma)
+1 346 248 7799 US (Houston)
+1 669 444 9171 US
+1 646 558 8656 US (New York)
+1 646 931 3860 US
+1 301 715 8592 US (Washington DC)
+1 309 205 3325 US
+1 312 626 6799 US (Chicago)
+1 386 347 5053 US
+1 564 217 2000 US
Meeting ID: 978 4541 7945
Find your local number: https://cuboulder.zoom.us/u/acegj8GnMV
Join by SIP
97845417945 at zoomcrc.com
Join by H.323
162.255.37.11 (US West)
162.255.36.11 (US East)
115.114.131.7 (India Mumbai)
115.114.115.7 (India Hyderabad)
213.19.144.110 (Amsterdam Netherlands)
213.244.140.110 (Germany)
103.122.166.55 (Australia Sydney)
103.122.167.55 (Australia Melbourne)
149.137.40.110 (Singapore)
64.211.144.160 (Brazil)
149.137.68.253 (Mexico)
69.174.57.160 (Canada Toronto)
65.39.152.160 (Canada Vancouver)
207.226.132.110 (Japan Tokyo)
149.137.24.110 (Japan Osaka)
Meeting ID: 978 4541 7945
Passcode: 432312
_______________________________________________________
*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
*CU Boulder acknowledges that it is located on the traditional territories
and ancestral homelands of the Cheyenne, Arapaho, Ute and many other Native
American nations. Their forced removal from these territories has caused
devastating and lasting impacts. Full CU Boulder land acknowledgment
<https://www.colorado.edu/about/land-acknowledgement> *
--
Scott Briggs (he/him/his)
Administrator
Advanced Study Program
Education, Engagement and Early-Career Development
National Center For Atmospheric Research
*phone: 303.497.1607*
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