[Grad-postdoc-assn] Fwd: ATOC Colloquium: Friday, September 29 @ 11am – Dr. Pragallva Barpanda – SEEC S228 and Zoom
Scott Briggs
sbriggs at ucar.edu
Thu Sep 28 09:02:38 MDT 2023
FYI
---------- Forwarded message ---------
From: Andrew Winters <andrew.c.winters at colorado.edu>
Date: Thu, Sep 28, 2023 at 7:22 AM
Subject: Re: ATOC Colloquium: Friday, September 29 @ 11am – Dr. Pragallva
Barpanda – SEEC S228 and Zoom
To: atoc-faculty at colorado.edu <atoc-faculty at colorado.edu>,
atoc-researchers at colorado.edu <atoc-researchers at colorado.edu>, ATOC
Graduate Students <atoc-students at colorado.edu>, atoc-majors at colorado.edu <
atoc-majors at colorado.edu>, atoc-minors at colorado.edu <
atoc-minors at colorado.edu>, atoc-colloquium at colorado.edu <
atoc-colloquium at colorado.edu>
Cc: Pragallva.Barpanda at uib.no <Pragallva.Barpanda at uib.no>,
pragallva.noaa at gmail.com <pragallva.noaa at gmail.com>
Hi everyone,
A reminder that the next ATOC Colloquium will be held in a hybrid
format on *Friday,
September 29 from 11a–12p MT over Zoom and in SEEC S228. *This week's
colloquium will feature a seminar from *Dr. Pragallva Barpanda (Univ. of
Bergen)* entitled, *"The role of subtropical Rossby waves in amplifying the
divergent circulation of the Madden Julian Oscillation (MJO)*". The zoom
login information and an abstract for the colloquium are provided below.
Please join us for conversation beginning at 10:45am MT, and stay
afterwards for a lunch catered by Illegal Pete's.
We look forward to seeing you on Friday!
-The ATOC Colloquium Committee
_________________________________________________
*The role of subtropical Rossby waves in amplifying the divergent
circulation of the Madden Julian Oscillation (MJO) *
Pragallva Barpanda (Univ. of Bergen)
The composite structure of the MJO has long been known to feature
pronounced Rossby gyres in the subtropical upper troposphere. However, it
is not known whether these subtropical gyre circulations have any
subsequent effects on the MJO convective outflow. In my talk, I will
disentangle the feedback mechanism from subtropics-to-tropics using
idealized model experiments. In particular, I use a nonlinear spherical
shallow water model with different imposed background jet profiles and an
assumed MJO-like thermal heat source. Results show that a stronger
subtropical jet leads to a stronger Kelvin-mode response in the tropics,
together with stronger divergent anomalies in the vicinity of the forcing.
To understand this behavior, additional calculations are performed in which
a localized vorticity forcing is imposed in the extratropics, without any
thermal forcing in the tropics. The response is once again seen to include
pronounced equatorial Kelvin-mode response, provided the jet is of
sufficient amplitude. A detailed analysis of the vorticity budget reveals
that the zonal-mean zonal wind shear plays a key role in amplifying the
Kelvin-mode divergent winds near the equator. These results help to explain
why the MJO tends to be strongest during boreal winter when the
Indo-Pacific jet is typically at its strongest.
__________________________________________________
*Zoom login Information:*
*Topic: ATOC Colloquium*
*Time: Sep 29, 2023 11:00 AM Mountain Time (US and Canada)*
*https://cuboulder.zoom.us/j/98582201579
<https://cuboulder.zoom.us/j/98582201579> Join our Cloud HD Video Meeting
<https://cuboulder.zoom.us/j/98582201579> Zoom is the leader in modern
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company headquartered in San Jose, CA. cuboulder.zoom.us
<http://cuboulder.zoom.us> *
*Meeting ID: 985 8220 1579*
*Passcode: ATOC*
One tap mobile
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Join by SIP
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Meeting ID: 985 8220 1579
Passcode: 166543
_______________________________________________________
*Andrew C. Winters*
Assistant Professor
Department of Atmospheric and Oceanic Sciences (ATOC)
University of Colorado Boulder
311 UCB, Boulder, CO 80309-0311
Phone: 303-735-5775
https://acwinters.weebly.com
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Facwinters.weebly.com%2F&data=05%7C01%7Catoc-colloquium%40colorado.edu%7Cd5cc360e87cd47d339f408dbc025ef57%7C3ded8b1b070d462982e4c0b019f46057%7C1%7C0%7C638315041399965893%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7UXbKM4KtYL5eB%2BunVP9bhiMGrkuimO%2B7JwURnFm380%3D&reserved=0>
||
@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:* Andrew Winters
*Sent:* Monday, September 25, 2023 8:14 AM
*To:* atoc-faculty at colorado.edu <atoc-faculty at colorado.edu>;
atoc-researchers at colorado.edu <atoc-researchers at colorado.edu>; ATOC
Graduate Students <atoc-students at colorado.edu>; atoc-majors at colorado.edu <
atoc-majors at colorado.edu>; atoc-minors at colorado.edu <
atoc-minors at colorado.edu>; atoc-colloquium at colorado.edu <
atoc-colloquium at colorado.edu>
*Cc:* Pragallva.Barpanda at uib.no <Pragallva.Barpanda at uib.no>;
pragallva.noaa at gmail.com <pragallva.noaa at gmail.com>
*Subject:* ATOC Colloquium: Friday, September 29 @ 11am – Dr. Pragallva
Barpanda – SEEC S228 and Zoom
Hi everyone,
The next ATOC Colloquium will be held in a hybrid format on *Friday,
September 29 from 11a–12p MT over Zoom and in SEEC S228. *This week's
colloquium will feature a seminar from *Dr. Pragallva Barpanda (Univ. of
Bergen)* entitled, *"The role of subtropical Rossby waves in amplifying the
divergent circulation of the Madden Julian Oscillation (MJO)*". The zoom
login information and an abstract for the colloquium are provided below.
Please join us for conversation beginning at 10:45am MT, and stay
afterwards for a lunch catered by Illegal Pete's.
We look forward to seeing you on Friday!
-The ATOC Colloquium Committee
_________________________________________________
*The role of subtropical Rossby waves in amplifying the divergent
circulation of the Madden Julian Oscillation (MJO) *
Pragallva Barpanda (Univ. of Bergen)
The composite structure of the MJO has long been known to feature
pronounced Rossby gyres in the subtropical upper troposphere. However, it
is not known whether these subtropical gyre circulations have any
subsequent effects on the MJO convective outflow. In my talk, I will
disentangle the feedback mechanism from subtropics-to-tropics using
idealized model experiments. In particular, I use a nonlinear spherical
shallow water model with different imposed background jet profiles and an
assumed MJO-like thermal heat source. Results show that a stronger
subtropical jet leads to a stronger Kelvin-mode response in the tropics,
together with stronger divergent anomalies in the vicinity of the forcing.
To understand this behavior, additional calculations are performed in which
a localized vorticity forcing is imposed in the extratropics, without any
thermal forcing in the tropics. The response is once again seen to include
pronounced equatorial Kelvin-mode response, provided the jet is of
sufficient amplitude. A detailed analysis of the vorticity budget reveals
that the zonal-mean zonal wind shear plays a key role in amplifying the
Kelvin-mode divergent winds near the equator. These results help to explain
why the MJO tends to be strongest during boreal winter when the
Indo-Pacific jet is typically at its strongest.
__________________________________________________
*Zoom login Information:*
*Topic: ATOC Colloquium*
*Time: Sep 29, 2023 11:00 AM Mountain Time (US and Canada)*
*https://cuboulder.zoom.us/j/98582201579
<https://cuboulder.zoom.us/j/98582201579>*
*Meeting ID: 985 8220 1579*
*Passcode: ATOC*
One tap mobile
+17193594580,,98582201579# US
+12532158782,,98582201579# US (Tacoma)
Dial by your location
• +1 719 359 4580 US
• +1 253 215 8782 US (Tacoma)
• +1 346 248 7799 US (Houston)
• +1 669 444 9171 US
• +1 669 900 6833 US (San Jose)
• +1 253 205 0468 US
• +1 564 217 2000 US
• +1 646 558 8656 US (New York)
• +1 646 931 3860 US
• +1 689 278 1000 US
• +1 301 715 8592 US (Washington DC)
• +1 305 224 1968 US
• +1 309 205 3325 US
• +1 312 626 6799 US (Chicago)
• +1 360 209 5623 US
• +1 386 347 5053 US
• +1 507 473 4847 US
Join by SIP
• 98582201579 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: 985 8220 1579
Passcode: 166543
_______________________________________________________
*Andrew C. Winters*
Assistant Professor
Department of Atmospheric and Oceanic Sciences (ATOC)
University of Colorado Boulder
311 UCB, Boulder, CO 80309-0311
Phone: 303-735-5775
https://acwinters.weebly.com
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Facwinters.weebly.com%2F&data=05%7C01%7Catoc-colloquium%40colorado.edu%7Cd5cc360e87cd47d339f408dbc025ef57%7C3ded8b1b070d462982e4c0b019f46057%7C1%7C0%7C638315041399965893%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7UXbKM4KtYL5eB%2BunVP9bhiMGrkuimO%2B7JwURnFm380%3D&reserved=0>
||
@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> *
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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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