Tropospheric Bromine Monoxide Vertical Profiles Retrieved Across the Alaskan Arctic in Springtime
Reactive halogen chemistry in the springtime Arctic causes ozone depletion events and alters the rate of pollution processing. There are still many uncertainties regarding this chemistry, including the multiphase recycling of halogens and how sea ice impacts the source strength of reactive bromine....
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ftcopernicus:oai:publications.copernicus.org:egusphere112230 2024-02-04T09:57:39+01:00 Tropospheric Bromine Monoxide Vertical Profiles Retrieved Across the Alaskan Arctic in Springtime Brockway, Nathaniel Peterson, Peter Bigge, Katja Hajny, Kristian Shepson, Paul Pratt, Kerri Fuentes, Jose Starn, Tim Kaeser, Robert Stirm, Brian Simpson, William 2024-01-03 application/pdf https://doi.org/10.5194/egusphere-2023-1284 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1284/ eng eng doi:10.5194/egusphere-2023-1284 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1284/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2023-1284 2024-01-08T17:24:18Z Reactive halogen chemistry in the springtime Arctic causes ozone depletion events and alters the rate of pollution processing. There are still many uncertainties regarding this chemistry, including the multiphase recycling of halogens and how sea ice impacts the source strength of reactive bromine. Adding to these uncertainties are the impacts of a rapidly warming Arctic. We present observations from the CHACHA (CHemistry in the Arctic: Clouds, Halogens, and Aerosols) field campaign based out of Utqiaġvik, Alaska, from mid-February to mid-April of 2022 to provide information on the vertical distribution of bromine monoxide (BrO), which is a tracer for reactive bromine chemistry. Data were gathered using the Heidelberg Airborne Imaging DOAS (differential optical absorption spectroscopy) Instrument (HAIDI) on the Purdue University Airborne Laboratory for Atmospheric Research (ALAR) and employing a unique sampling technique of vertically profiling the lower atmosphere with the aircraft via “porpoising” maneuvers. Observations from HAIDI were coupled to radiative transfer model calculations to retrieve mixing ratio profiles throughout the lower atmosphere (below 1000 m), with unprecedented vertical resolution (50 m) and total information gathered (average of 17.5 degrees of freedom) for this region. A cluster analysis was used to categorize 245 retrieved BrO mixing ratio vertical profiles into four common profile shapes. We often found the highest BrO mixing ratios at the Earth's surface with a mean of nearly 30 pmol mol −1 in the lowest 50 m, indicating an important role for multiphase chemistry on the snowpack in reactive bromine production. Most lofted-BrO profiles corresponded with an aerosol profile that peaked at the same altitude (225 m above the ground), suggesting that BrO was maintained due to heterogeneous reactions on particle surfaces aloft during these profiles. A majority (11 of 15) of the identified lofted-BrO profiles occurred on a single day, 19 March 2022, over an area covering more than 24 000 km ... Text Arctic Sea ice Alaska Copernicus Publications: E-Journals Alar ENVELOPE(117.883,117.883,63.233,63.233) Arctic Chacha ENVELOPE(40.518,40.518,65.666,65.666) |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Reactive halogen chemistry in the springtime Arctic causes ozone depletion events and alters the rate of pollution processing. There are still many uncertainties regarding this chemistry, including the multiphase recycling of halogens and how sea ice impacts the source strength of reactive bromine. Adding to these uncertainties are the impacts of a rapidly warming Arctic. We present observations from the CHACHA (CHemistry in the Arctic: Clouds, Halogens, and Aerosols) field campaign based out of Utqiaġvik, Alaska, from mid-February to mid-April of 2022 to provide information on the vertical distribution of bromine monoxide (BrO), which is a tracer for reactive bromine chemistry. Data were gathered using the Heidelberg Airborne Imaging DOAS (differential optical absorption spectroscopy) Instrument (HAIDI) on the Purdue University Airborne Laboratory for Atmospheric Research (ALAR) and employing a unique sampling technique of vertically profiling the lower atmosphere with the aircraft via “porpoising” maneuvers. Observations from HAIDI were coupled to radiative transfer model calculations to retrieve mixing ratio profiles throughout the lower atmosphere (below 1000 m), with unprecedented vertical resolution (50 m) and total information gathered (average of 17.5 degrees of freedom) for this region. A cluster analysis was used to categorize 245 retrieved BrO mixing ratio vertical profiles into four common profile shapes. We often found the highest BrO mixing ratios at the Earth's surface with a mean of nearly 30 pmol mol −1 in the lowest 50 m, indicating an important role for multiphase chemistry on the snowpack in reactive bromine production. Most lofted-BrO profiles corresponded with an aerosol profile that peaked at the same altitude (225 m above the ground), suggesting that BrO was maintained due to heterogeneous reactions on particle surfaces aloft during these profiles. A majority (11 of 15) of the identified lofted-BrO profiles occurred on a single day, 19 March 2022, over an area covering more than 24 000 km ... |
format |
Text |
author |
Brockway, Nathaniel Peterson, Peter Bigge, Katja Hajny, Kristian Shepson, Paul Pratt, Kerri Fuentes, Jose Starn, Tim Kaeser, Robert Stirm, Brian Simpson, William |
spellingShingle |
Brockway, Nathaniel Peterson, Peter Bigge, Katja Hajny, Kristian Shepson, Paul Pratt, Kerri Fuentes, Jose Starn, Tim Kaeser, Robert Stirm, Brian Simpson, William Tropospheric Bromine Monoxide Vertical Profiles Retrieved Across the Alaskan Arctic in Springtime |
author_facet |
Brockway, Nathaniel Peterson, Peter Bigge, Katja Hajny, Kristian Shepson, Paul Pratt, Kerri Fuentes, Jose Starn, Tim Kaeser, Robert Stirm, Brian Simpson, William |
author_sort |
Brockway, Nathaniel |
title |
Tropospheric Bromine Monoxide Vertical Profiles Retrieved Across the Alaskan Arctic in Springtime |
title_short |
Tropospheric Bromine Monoxide Vertical Profiles Retrieved Across the Alaskan Arctic in Springtime |
title_full |
Tropospheric Bromine Monoxide Vertical Profiles Retrieved Across the Alaskan Arctic in Springtime |
title_fullStr |
Tropospheric Bromine Monoxide Vertical Profiles Retrieved Across the Alaskan Arctic in Springtime |
title_full_unstemmed |
Tropospheric Bromine Monoxide Vertical Profiles Retrieved Across the Alaskan Arctic in Springtime |
title_sort |
tropospheric bromine monoxide vertical profiles retrieved across the alaskan arctic in springtime |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2023-1284 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1284/ |
long_lat |
ENVELOPE(117.883,117.883,63.233,63.233) ENVELOPE(40.518,40.518,65.666,65.666) |
geographic |
Alar Arctic Chacha |
geographic_facet |
Alar Arctic Chacha |
genre |
Arctic Sea ice Alaska |
genre_facet |
Arctic Sea ice Alaska |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2023-1284 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1284/ |
op_doi |
https://doi.org/10.5194/egusphere-2023-1284 |
_version_ |
1789961984983171072 |