[Grad-postdoc-assn] Fwd: ATOC Colloquium (Fri. Feb. 9 @ 11am MT) – Vikas Nataraja, McKenzie Hawkins, James Kasic – SEEC S372A/B and Zoom
Scott Briggs
sbriggs at ucar.edu
Thu Feb 8 08:27:29 MST 2024
FYI
---------- Forwarded message ---------
From: Andrew Winters <andrew.c.winters at colorado.edu>
Date: Thu, Feb 8, 2024 at 8:00 AM
Subject: Re: ATOC Colloquium (Fri. Feb. 9 @ 11am MT) – Vikas Nataraja,
McKenzie Hawkins, James Kasic – SEEC S372A/B and Zoom
To: ATOC Faculty <atoc-faculty 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 Researchers <atoc-researchers at colorado.edu>,
atoc-colloquium at colorado.edu <atoc-colloquium at colorado.edu>
Hi everyone,
A reminder that the next ATOC Colloquium will be held in a hybrid
format on *Friday,
February 9 from 11a–12p MT over Zoom and in SEEC S372A/B*. *Note the room
change from prior colloquia!* This week's colloquium will feature a trio of
conference-length talks from graduate students, *Vikas Nataraja, McKenzie
Hawkins, and James Kasic.* The zoom login information and abstracts for
each talk 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
_________________________________________________
*Go With the Floe: A Lagrangian Approach to BRDF/Albedo Retrieval for
Arctic Sea Ice in the Context of the Upcoming NASA ARCSIX Aircraft Campaign*
Vikas Nataraja
The albedo of Arctic sea ice and snow-covered surfaces is of fundamental
importance for the surface energy budget, and therefore melt and freeze
processes during the Arctic summer and shoulder seasons. The surface albedo
can be obtained from the angular integration of the Bidirectional
Reflectance Distribution Function (BRDF), which in turn can be derived from
multiple sequential, cloud-cleared overpasses from imagers that provide
surface reflectance at a given (fixed) location for a range of sun-sensor
geometries. Since the late 1990s, the MODerate resolution Imaging
Spectroradiometers (MODIS) and the Visible Infrared Imaging Radiometer
Suite (VIIRS) have provided a BRDF/albedo product for land surfaces
(including snow- and ice-covered areas). However, the standard product is
not available for sea ice because (1) the low contrast between clouds and
bright surfaces (such as ice and snow) poses a challenge for cloud
detection and clearing, and (2) ice floes drift over time, which challenges
the fixed surface assumption. We propose a novel technique to characterize
the surface of drifting sea ice floes and snow by combining long-standing
data sets from passive shortwave satellite imagery with machine learning
algorithms to track the ice floes in an object-oriented approach, and
therefore literally "going with the floe". The upcoming NASA ARCSIX
Aircraft Campaign will further help to quantify the contributions of
clouds, aerosols, and precipitation to the Arctic summer surface radiation
budget and sea-ice melt of a region of interest, which in turn provides a
new source of validation for our Lagrangian approach. By isolating the role
of radiation in snow/ice processes, our proposed approach combined with
ARCSIX will enhance our capabilities in the challenging conditions of the
Arctic and enable more accurate estimates of the cloud-radiative effect and
ice-albedo feedback.
*Bridging the Gaps: A CubeSat’s Capability to Enhance Earth’s Radiation
Budget Observations from Space*
McKenzie Hawkins
We report novel comparative analyses between a principally Sun-observing
CubeSat and the Clouds and Earth’s Radiant Energy System (CERES) to
complement future Earth Radiation Budget (ERB) missions in space. The ERB
involves absorbed and reflected solar radiation and emitted thermal
radiation. The imbalance in the ERB remains uncertain and is fundamental
for understanding climate change. Satellite remote sensing provides ERB
observations from space. CERES data represents twenty years of state-of-the
art continuous ERB records. The Compact Total Irradiance Monitor (CTIM) was
a nadir-viewing, 6U CubeSat that used novel vertically aligned carbon
nanotube (VACNT) bolometers to principally measure the Total Solar
Irradiance (TSI) of the Sun. CTIM also pointed to Earth for opportunistic
radiation observations during its seventeen-month lifespan in orbit. New
longwave radiance comparative analyses between CTIM and CERES instruments
show agreement between the two different platforms for radiance
measurements.
*Dual Comb Spectroscopy – Open Path Greenhouse Gas Measurements in New York
City*
James Kasic
Dual comb spectroscopy (DCS) is an emerging remote sensing technique able
to quickly measure broad spectra absorbance with extremely high spectral
resolution. Recent studies have shown that DCS can measure H2O, CO2, and
CH4 simultaneously and with less than .05% errors in outdoor environments.
>From July to November 2023, a NIST DCS system was deployed in New York City
to measure over-city greenhouse gas emissions. At the same time, many other
atmospheric profiling measurements were taking place in NYC as part of the
CUPiDS and AEROMMA campaigns, including point sensors and aircraft also
measuring CO2 and CH4. This provides an opportunity to evaluate how DCS
measurements can be implemented to bolster other measurement techniques and
provide additional insight. This talk will introduce DCS, show initial
results from the NYC deployment, and discuss how the DCS may be used
alongside other measurements.
__________________________________________________
*Zoom login Information:*
*Topic: ATOC Colloquium*
*Time: Feb 9, 2024 11:00 AM Mountain Time (US and Canada)*
*https://cuboulder.zoom.us/j/93794324385
<https://cuboulder.zoom.us/j/93794324385>*
*Meeting ID: 937 9432 4385*
*Passcode: ATOC*
One tap mobile
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+12532050468,,93794324385# US
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Meeting ID: 937 9432 4385
Passcode: 856068
_______________________________________________________
*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%7C02%7Catoc-colloquium%40colorado.edu%7Cef11f99c13c94550c8a808dc28b6acbb%7C3ded8b1b070d462982e4c0b019f46057%7C1%7C0%7C638430012253145866%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=QhqkbYlisKmkG0y4VtWDd9BJGxcbtQ47ovHfB2EUgbs%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:* Friday, February 2, 2024 3:21 PM
*To:* ATOC Faculty <atoc-faculty 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 Researchers <atoc-researchers at colorado.edu>;
atoc-colloquium at colorado.edu <atoc-colloquium at colorado.edu>
*Subject:* ATOC Colloquium (Fri. Feb. 9 @ 11am MT) – Vikas Nataraja,
McKenzie Hawkins, James Kasic – SEEC S372A/B and Zoom
Hi everyone,
The next ATOC Colloquium will be held in a hybrid format on *Friday,
February 9 from 11a–12p MT over Zoom and in SEEC S372A/B*. *Note the room
change relative to prior colloquia!* This week's colloquium will feature a
trio of conference-length talks from graduate students, *Vikas Nataraja,
McKenzie Hawkins, and James Kasic.* The zoom login information and
abstracts for each talk 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
_________________________________________________
*Go With the Floe: A Lagrangian Approach to BRDF/Albedo Retrieval for
Arctic Sea Ice in the Context of the Upcoming NASA ARCSIX Aircraft Campaign*
Vikas Nataraja
The albedo of Arctic sea ice and snow-covered surfaces is of fundamental
importance for the surface energy budget, and therefore melt and freeze
processes during the Arctic summer and shoulder seasons. The surface albedo
can be obtained from the angular integration of the Bidirectional
Reflectance Distribution Function (BRDF), which in turn can be derived from
multiple sequential, cloud-cleared overpasses from imagers that provide
surface reflectance at a given (fixed) location for a range of sun-sensor
geometries. Since the late 1990s, the MODerate resolution Imaging
Spectroradiometers (MODIS) and the Visible Infrared Imaging Radiometer
Suite (VIIRS) have provided a BRDF/albedo product for land surfaces
(including snow- and ice-covered areas). However, the standard product is
not available for sea ice because (1) the low contrast between clouds and
bright surfaces (such as ice and snow) poses a challenge for cloud
detection and clearing, and (2) ice floes drift over time, which challenges
the fixed surface assumption. We propose a novel technique to characterize
the surface of drifting sea ice floes and snow by combining long-standing
data sets from passive shortwave satellite imagery with machine learning
algorithms to track the ice floes in an object-oriented approach, and
therefore literally "going with the floe". The upcoming NASA ARCSIX
Aircraft Campaign will further help to quantify the contributions of
clouds, aerosols, and precipitation to the Arctic summer surface radiation
budget and sea-ice melt of a region of interest, which in turn provides a
new source of validation for our Lagrangian approach. By isolating the role
of radiation in snow/ice processes, our proposed approach combined with
ARCSIX will enhance our capabilities in the challenging conditions of the
Arctic and enable more accurate estimates of the cloud-radiative effect and
ice-albedo feedback.
*Bridging the Gaps: A CubeSat’s Capability to Enhance Earth’s Radiation
Budget Observations from Space*
McKenzie Hawkins
We report novel comparative analyses between a principally Sun-observing
CubeSat and the Clouds and Earth’s Radiant Energy System (CERES) to
complement future Earth Radiation Budget (ERB) missions in space. The ERB
involves absorbed and reflected solar radiation and emitted thermal
radiation. The imbalance in the ERB remains uncertain and is fundamental
for understanding climate change. Satellite remote sensing provides ERB
observations from space. CERES data represents twenty years of state-of-the
art continuous ERB records. The Compact Total Irradiance Monitor (CTIM) was
a nadir-viewing, 6U CubeSat that used novel vertically aligned carbon
nanotube (VACNT) bolometers to principally measure the Total Solar
Irradiance (TSI) of the Sun. CTIM also pointed to Earth for opportunistic
radiation observations during its seventeen-month lifespan in orbit. New
longwave radiance comparative analyses between CTIM and CERES instruments
show agreement between the two different platforms for radiance
measurements.
*Dual Comb Spectroscopy – Open Path Greenhouse Gas Measurements in New York
City*
James Kasic
Dual comb spectroscopy (DCS) is an emerging remote sensing technique able
to quickly measure broad spectra absorbance with extremely high spectral
resolution. Recent studies have shown that DCS can measure H2O, CO2, and
CH4 simultaneously and with less than .05% errors in outdoor environments.
>From July to November 2023, a NIST DCS system was deployed in New York City
to measure over-city greenhouse gas emissions. At the same time, many other
atmospheric profiling measurements were taking place in NYC as part of the
CUPiDS and AEROMMA campaigns, including point sensors and aircraft also
measuring CO2 and CH4. This provides an opportunity to evaluate how DCS
measurements can be implemented to bolster other measurement techniques and
provide additional insight. This talk will introduce DCS, show initial
results from the NYC deployment, and discuss how the DCS may be used
alongside other measurements.
__________________________________________________
*Zoom login Information:*
*Topic: ATOC Colloquium*
*Time: Feb 9, 2024 11:00 AM Mountain Time (US and Canada)*
*https://cuboulder.zoom.us/j/93794324385
<https://cuboulder.zoom.us/j/93794324385>*
*Meeting ID: 937 9432 4385*
*Passcode: ATOC*
One tap mobile
+17193594580,,93794324385# US
+12532050468,,93794324385# US
Dial by your location
• +1 719 359 4580 US
• +1 253 205 0468 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)
• +1 646 558 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
• +1 564 217 2000 US
Join by SIP
• 93794324385 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: 937 9432 4385
Passcode: 856068
_______________________________________________________
*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%7C02%7Catoc-colloquium%40colorado.edu%7Cef11f99c13c94550c8a808dc28b6acbb%7C3ded8b1b070d462982e4c0b019f46057%7C1%7C0%7C638430012253302135%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=LPk8411t6jNyyf9u9YksJLA%2F0OJUVvs3zVfwtLuobHs%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
NSF National Center For Atmospheric Research
*phone: 303.497.1607*
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