A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000
Reported here are modeling results based on ISCAT (Investigation of Sulfur Chemistry of Antarctic Troposphere) 2000 observations recorded at the South Pole (SP) during the Austral Summer of 2000. The observations included a comprehensive set of photochemical parameters, e.g., NO, O3, and CO. It is w...
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ftuninhampshire:oai:scholars.unh.edu:earthsci_facpub-1027 2023-05-15T13:41:56+02:00 A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000 Chen, G Davis, D D Crawford, J Hutterli, Manuel Huey, L Gregory Slusher, D Mauldin, Lee Eisele, Fred Tanner, D Dibb, Jack E. Buhr, Martin McConnell, J R Lefer, Barry Shetter, R E Blake, D R Song, C H Lombardi, K Arnoldy, J 2004-10-01T07:00:00Z text/html https://scholars.unh.edu/earthsci_facpub/28 https://doi.org/10.1016/j.atmosenv.2003.07.018 unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/earthsci_facpub/28 http://dx.doi.org/10.1016/j.atmosenv.2003.07.018 r 2004 Elsevier Ltd. All rights reserved. Earth Sciences Scholarship Antarctica South Pole Photochemistry HOx Snow emissions ISCAT Atmospheric Sciences text 2004 ftuninhampshire https://doi.org/10.1016/j.atmosenv.2003.07.018 2023-01-30T21:34:09Z Reported here are modeling results based on ISCAT (Investigation of Sulfur Chemistry of Antarctic Troposphere) 2000 observations recorded at the South Pole (SP) during the Austral Summer of 2000. The observations included a comprehensive set of photochemical parameters, e.g., NO, O3, and CO. It is worthy to note that not only were OH and HO2 observed, but also HOx precursor species CH2O, H2O2, and HONO were measured. Previous studies have suggested that HONO is the major source of OH/HOx in the Arctic; however, observed HONO levels at SPinduced dramatic model overprediction of both HOx and NOx when used to constrain the model calculations. In contrast, model predictions constrained by observed values of CH2O and H2O2 are consistent with the observations of OH and HO2 (i.e., within 20%) for more than half of the data. Significant model overpredictions of OH, however, were seen at the NO levels lower than 50 pptv or higher than 150 pptv. An analysis of HOx budget at the median NO level suggests that snow emissions of H2O2 and CH2O are the single most important primary source of SPHOx, contributing 46% to the total source. Major sinks for HOx are found to be dry deposition of HO2NO2 and HNO3 as well as their reactions with OH. Although ISCAT 2000 led to a major progress in our understanding of SPHOx chemistry, critical aspects of this chemistry are still in need of further investigation. Text Antarc* Antarctic Antarctica Arctic South pole South pole University of New Hampshire: Scholars Repository Arctic Antarctic Austral South Pole Atmospheric Environment 38 32 5451 5461 |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
topic |
Antarctica South Pole Photochemistry HOx Snow emissions ISCAT Atmospheric Sciences |
spellingShingle |
Antarctica South Pole Photochemistry HOx Snow emissions ISCAT Atmospheric Sciences Chen, G Davis, D D Crawford, J Hutterli, Manuel Huey, L Gregory Slusher, D Mauldin, Lee Eisele, Fred Tanner, D Dibb, Jack E. Buhr, Martin McConnell, J R Lefer, Barry Shetter, R E Blake, D R Song, C H Lombardi, K Arnoldy, J A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000 |
topic_facet |
Antarctica South Pole Photochemistry HOx Snow emissions ISCAT Atmospheric Sciences |
description |
Reported here are modeling results based on ISCAT (Investigation of Sulfur Chemistry of Antarctic Troposphere) 2000 observations recorded at the South Pole (SP) during the Austral Summer of 2000. The observations included a comprehensive set of photochemical parameters, e.g., NO, O3, and CO. It is worthy to note that not only were OH and HO2 observed, but also HOx precursor species CH2O, H2O2, and HONO were measured. Previous studies have suggested that HONO is the major source of OH/HOx in the Arctic; however, observed HONO levels at SPinduced dramatic model overprediction of both HOx and NOx when used to constrain the model calculations. In contrast, model predictions constrained by observed values of CH2O and H2O2 are consistent with the observations of OH and HO2 (i.e., within 20%) for more than half of the data. Significant model overpredictions of OH, however, were seen at the NO levels lower than 50 pptv or higher than 150 pptv. An analysis of HOx budget at the median NO level suggests that snow emissions of H2O2 and CH2O are the single most important primary source of SPHOx, contributing 46% to the total source. Major sinks for HOx are found to be dry deposition of HO2NO2 and HNO3 as well as their reactions with OH. Although ISCAT 2000 led to a major progress in our understanding of SPHOx chemistry, critical aspects of this chemistry are still in need of further investigation. |
format |
Text |
author |
Chen, G Davis, D D Crawford, J Hutterli, Manuel Huey, L Gregory Slusher, D Mauldin, Lee Eisele, Fred Tanner, D Dibb, Jack E. Buhr, Martin McConnell, J R Lefer, Barry Shetter, R E Blake, D R Song, C H Lombardi, K Arnoldy, J |
author_facet |
Chen, G Davis, D D Crawford, J Hutterli, Manuel Huey, L Gregory Slusher, D Mauldin, Lee Eisele, Fred Tanner, D Dibb, Jack E. Buhr, Martin McConnell, J R Lefer, Barry Shetter, R E Blake, D R Song, C H Lombardi, K Arnoldy, J |
author_sort |
Chen, G |
title |
A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000 |
title_short |
A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000 |
title_full |
A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000 |
title_fullStr |
A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000 |
title_full_unstemmed |
A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000 |
title_sort |
reassessment of hox south pole chemistry based on observations recorded during iscat 2000 |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2004 |
url |
https://scholars.unh.edu/earthsci_facpub/28 https://doi.org/10.1016/j.atmosenv.2003.07.018 |
geographic |
Arctic Antarctic Austral South Pole |
geographic_facet |
Arctic Antarctic Austral South Pole |
genre |
Antarc* Antarctic Antarctica Arctic South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica Arctic South pole South pole |
op_source |
Earth Sciences Scholarship |
op_relation |
https://scholars.unh.edu/earthsci_facpub/28 http://dx.doi.org/10.1016/j.atmosenv.2003.07.018 |
op_rights |
r 2004 Elsevier Ltd. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.atmosenv.2003.07.018 |
container_title |
Atmospheric Environment |
container_volume |
38 |
container_issue |
32 |
container_start_page |
5451 |
op_container_end_page |
5461 |
_version_ |
1766160729630572544 |