Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica
11 pags., 8 figs., 2 tabs. Bromine chemistry plays an important role in tropospheric ozone depletion events in polar regions. Autocatalytic reactions lead to bromine explosion events, causing ozone depletion to near-zero levels in the polar troposphere. Bromine chemistry over Antarctica is not fully...
Main Authors: | , , , , , , , , , |
---|---|
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2023
|
Subjects: | |
Online Access: | http://hdl.handle.net/10261/344701 https://doi.org/10.1016/j.polar.2023.100977 https://doi.org/10.13039/501100001851 https://api.elsevier.com/content/abstract/scopus_id/85169062523 |
id |
ftcsic:oai:digital.csic.es:10261/344701 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/344701 2024-06-23T07:47:53+00:00 Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica Wagh, Shrutika P. Joge, Sankirna D. Singh, Surendra Mali, Prithviraj Beirle, Steffen Wagner, Thomas Bucci, Silvia Saiz-Lopez, A. Bhawar, Rohini Mahajan, Anoop S. Ministry of Earth Sciences (India) Joge, Sankirna D. Mali, Prithviraj Bucci, Silvia Mahajan, Anoop S. 2023-12-01 http://hdl.handle.net/10261/344701 https://doi.org/10.1016/j.polar.2023.100977 https://doi.org/10.13039/501100001851 https://api.elsevier.com/content/abstract/scopus_id/85169062523 en eng Elsevier Polar Science Postprint https://doi.org/10.1016/j.polar.2023.100977 Sí Polar Science 38:100977 (2023) 1873-9652 http://hdl.handle.net/10261/344701 doi:10.1016/j.polar.2023.100977 http://dx.doi.org/10.13039/501100001851 2-s2.0-85169062523 https://api.elsevier.com/content/abstract/scopus_id/85169062523 embargo_20251201 artículo http://purl.org/coar/resource_type/c_6501 2023 ftcsic https://doi.org/10.1016/j.polar.2023.10097710.13039/501100001851 2024-05-29T00:06:20Z 11 pags., 8 figs., 2 tabs. Bromine chemistry plays an important role in tropospheric ozone depletion events in polar regions. Autocatalytic reactions lead to bromine explosion events, causing ozone depletion to near-zero levels in the polar troposphere. Bromine chemistry over Antarctica is not fully understood, and ground-based observations are scarce. This work presents year-long observations of bromine oxide (BrO) over the Bharati station (69.41°S, 76.19°E) using Multi-axis Differential Optical Absorption Spectroscopy (MAX-DOAS) from December 2018 to February 2020. The results show that elevated BrO mixing ratios were found during spring (September), with a maximum value of 10.21 ± 4.38 pptv for clear sky conditions and 33.15 ± 2.23 pptv for cloudy conditions. BrO was not observed above the detection limit (∼3 × 1013 molecule cm−2) outside spring on clear days. In general, lower mixing ratios were observed on clear days over Bharati compared to stations in West Antarctica. This indicates a different source strength over East Antarctica compared to West Antarctica. BrO vertical column densities were high during spring, with a maximum value of 1.34 ± 0.35 × 1014 molecule cm−2. The vertical profiles of the BrO mixing ratios show a peak at the surface during spring (average of 6.5 ± 1.91 pptv), decreasing sharply with altitude. Back trajectories show that air masses passing over the first year ice showed higher BrO, although factors such as meteorology play an important role in determining the absolute levels. Using a box model, we show that bromine chemistry can deplete as much as 2.15 ppb of ozone in a day at the Bharati Station on clear days, which shows that it does not lead to complete ozone depletion events over Bharati. IITM is funded by the Ministry of Earth Sciences, Government of India. The authors also wish to thank all the participants of the 38th Indian Scientific Expedition to Antarctica for their support in making the observations. Peer reviewed Article in Journal/Newspaper Antarc* Antarctica East Antarctica Polar Science Polar Science West Antarctica Digital.CSIC (Spanish National Research Council) East Antarctica Indian West Antarctica |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
11 pags., 8 figs., 2 tabs. Bromine chemistry plays an important role in tropospheric ozone depletion events in polar regions. Autocatalytic reactions lead to bromine explosion events, causing ozone depletion to near-zero levels in the polar troposphere. Bromine chemistry over Antarctica is not fully understood, and ground-based observations are scarce. This work presents year-long observations of bromine oxide (BrO) over the Bharati station (69.41°S, 76.19°E) using Multi-axis Differential Optical Absorption Spectroscopy (MAX-DOAS) from December 2018 to February 2020. The results show that elevated BrO mixing ratios were found during spring (September), with a maximum value of 10.21 ± 4.38 pptv for clear sky conditions and 33.15 ± 2.23 pptv for cloudy conditions. BrO was not observed above the detection limit (∼3 × 1013 molecule cm−2) outside spring on clear days. In general, lower mixing ratios were observed on clear days over Bharati compared to stations in West Antarctica. This indicates a different source strength over East Antarctica compared to West Antarctica. BrO vertical column densities were high during spring, with a maximum value of 1.34 ± 0.35 × 1014 molecule cm−2. The vertical profiles of the BrO mixing ratios show a peak at the surface during spring (average of 6.5 ± 1.91 pptv), decreasing sharply with altitude. Back trajectories show that air masses passing over the first year ice showed higher BrO, although factors such as meteorology play an important role in determining the absolute levels. Using a box model, we show that bromine chemistry can deplete as much as 2.15 ppb of ozone in a day at the Bharati Station on clear days, which shows that it does not lead to complete ozone depletion events over Bharati. IITM is funded by the Ministry of Earth Sciences, Government of India. The authors also wish to thank all the participants of the 38th Indian Scientific Expedition to Antarctica for their support in making the observations. Peer reviewed |
author2 |
Ministry of Earth Sciences (India) Joge, Sankirna D. Mali, Prithviraj Bucci, Silvia Mahajan, Anoop S. |
format |
Article in Journal/Newspaper |
author |
Wagh, Shrutika P. Joge, Sankirna D. Singh, Surendra Mali, Prithviraj Beirle, Steffen Wagner, Thomas Bucci, Silvia Saiz-Lopez, A. Bhawar, Rohini Mahajan, Anoop S. |
spellingShingle |
Wagh, Shrutika P. Joge, Sankirna D. Singh, Surendra Mali, Prithviraj Beirle, Steffen Wagner, Thomas Bucci, Silvia Saiz-Lopez, A. Bhawar, Rohini Mahajan, Anoop S. Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica |
author_facet |
Wagh, Shrutika P. Joge, Sankirna D. Singh, Surendra Mali, Prithviraj Beirle, Steffen Wagner, Thomas Bucci, Silvia Saiz-Lopez, A. Bhawar, Rohini Mahajan, Anoop S. |
author_sort |
Wagh, Shrutika P. |
title |
Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica |
title_short |
Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica |
title_full |
Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica |
title_fullStr |
Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica |
title_full_unstemmed |
Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica |
title_sort |
year-long ground-based observations of bromine oxide over bharati station, antarctica |
publisher |
Elsevier |
publishDate |
2023 |
url |
http://hdl.handle.net/10261/344701 https://doi.org/10.1016/j.polar.2023.100977 https://doi.org/10.13039/501100001851 https://api.elsevier.com/content/abstract/scopus_id/85169062523 |
geographic |
East Antarctica Indian West Antarctica |
geographic_facet |
East Antarctica Indian West Antarctica |
genre |
Antarc* Antarctica East Antarctica Polar Science Polar Science West Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica Polar Science Polar Science West Antarctica |
op_relation |
Polar Science Postprint https://doi.org/10.1016/j.polar.2023.100977 Sí Polar Science 38:100977 (2023) 1873-9652 http://hdl.handle.net/10261/344701 doi:10.1016/j.polar.2023.100977 http://dx.doi.org/10.13039/501100001851 2-s2.0-85169062523 https://api.elsevier.com/content/abstract/scopus_id/85169062523 |
op_rights |
embargo_20251201 |
op_doi |
https://doi.org/10.1016/j.polar.2023.10097710.13039/501100001851 |
_version_ |
1802638103848943616 |