A reassessment of HO x 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, O 3, and CO. It is...
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ftcdlib:oai:escholarship.org/ark:/13030/qt2h41826d 2023-05-15T14:02:59+02:00 A reassessment of HO x South Pole chemistry based on observations recorded during ISCAT 2000 Chen, G Davis, D Crawford, J Hutterli, LM Huey, LG Slusher, D Mauldin, L Eisele, F Tanner, D Dibb, J Buhr, M McConnell, J Lefer, B Shetter, R Blake, D Song, CH Lombardi, K Arnoldy, J 5451 - 5461 2004-10-01 application/pdf https://escholarship.org/uc/item/2h41826d unknown eScholarship, University of California qt2h41826d https://escholarship.org/uc/item/2h41826d CC-BY CC-BY Atmospheric Environment, vol 38, iss 32 Antarctica South Pole photochemistry HOx snow emissions ISCAT Environmental Engineering Atmospheric Sciences Statistics Meteorology & Atmospheric Sciences article 2004 ftcdlib 2021-06-21T17:05:33Z 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, O 3, and CO. It is worthy to note that not only were OH and HO 2 observed, but also HO x precursor species CH 2O, H 2O 2, and HONO were measured. Previous studies have suggested that HONO is the major source of OH/HO x in the Arctic; however, observed HONO levels at SP induced dramatic model overprediction of both HO x and NO x when used to constrain the model calculations. In contrast, model predictions constrained by observed values of CH 2O and H 2O 2 are consistent with the observations of OH and HO 2 (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 50pptv or higher than 150pptv. An analysis of HO x budget at the median NO level suggests that snow emissions of H 2O 2 and CH 2O are the single most important primary source of SP HO x, contributing 46% to the total source. Major sinks for HO x are found to be dry deposition of HO 2NO 2 and HNO 3 as well as their reactions with OH. Although ISCAT 2000 led to a major progress in our understanding of SP HO x chemistry, critical aspects of this chemistry are still in need of further investigation. © 2004 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctica Arctic South pole South pole University of California: eScholarship Antarctic Arctic Austral South Pole |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Antarctica South Pole photochemistry HOx snow emissions ISCAT Environmental Engineering Atmospheric Sciences Statistics Meteorology & Atmospheric Sciences |
spellingShingle |
Antarctica South Pole photochemistry HOx snow emissions ISCAT Environmental Engineering Atmospheric Sciences Statistics Meteorology & Atmospheric Sciences Chen, G Davis, D Crawford, J Hutterli, LM Huey, LG Slusher, D Mauldin, L Eisele, F Tanner, D Dibb, J Buhr, M McConnell, J Lefer, B Shetter, R Blake, D Song, CH Lombardi, K Arnoldy, J A reassessment of HO x South Pole chemistry based on observations recorded during ISCAT 2000 |
topic_facet |
Antarctica South Pole photochemistry HOx snow emissions ISCAT Environmental Engineering Atmospheric Sciences Statistics Meteorology & 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, O 3, and CO. It is worthy to note that not only were OH and HO 2 observed, but also HO x precursor species CH 2O, H 2O 2, and HONO were measured. Previous studies have suggested that HONO is the major source of OH/HO x in the Arctic; however, observed HONO levels at SP induced dramatic model overprediction of both HO x and NO x when used to constrain the model calculations. In contrast, model predictions constrained by observed values of CH 2O and H 2O 2 are consistent with the observations of OH and HO 2 (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 50pptv or higher than 150pptv. An analysis of HO x budget at the median NO level suggests that snow emissions of H 2O 2 and CH 2O are the single most important primary source of SP HO x, contributing 46% to the total source. Major sinks for HO x are found to be dry deposition of HO 2NO 2 and HNO 3 as well as their reactions with OH. Although ISCAT 2000 led to a major progress in our understanding of SP HO x chemistry, critical aspects of this chemistry are still in need of further investigation. © 2004 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Chen, G Davis, D Crawford, J Hutterli, LM Huey, LG Slusher, D Mauldin, L Eisele, F Tanner, D Dibb, J Buhr, M McConnell, J Lefer, B Shetter, R Blake, D Song, CH Lombardi, K Arnoldy, J |
author_facet |
Chen, G Davis, D Crawford, J Hutterli, LM Huey, LG Slusher, D Mauldin, L Eisele, F Tanner, D Dibb, J Buhr, M McConnell, J Lefer, B Shetter, R Blake, D Song, CH Lombardi, K Arnoldy, J |
author_sort |
Chen, G |
title |
A reassessment of HO x South Pole chemistry based on observations recorded during ISCAT 2000 |
title_short |
A reassessment of HO x South Pole chemistry based on observations recorded during ISCAT 2000 |
title_full |
A reassessment of HO x South Pole chemistry based on observations recorded during ISCAT 2000 |
title_fullStr |
A reassessment of HO x South Pole chemistry based on observations recorded during ISCAT 2000 |
title_full_unstemmed |
A reassessment of HO x South Pole chemistry based on observations recorded during ISCAT 2000 |
title_sort |
reassessment of ho x south pole chemistry based on observations recorded during iscat 2000 |
publisher |
eScholarship, University of California |
publishDate |
2004 |
url |
https://escholarship.org/uc/item/2h41826d |
op_coverage |
5451 - 5461 |
geographic |
Antarctic Arctic Austral South Pole |
geographic_facet |
Antarctic Arctic Austral South Pole |
genre |
Antarc* Antarctic Antarctica Arctic South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica Arctic South pole South pole |
op_source |
Atmospheric Environment, vol 38, iss 32 |
op_relation |
qt2h41826d https://escholarship.org/uc/item/2h41826d |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766273433679691776 |