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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Published in:Atmospheric Environment
Main Authors: 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
Format: Text
Language:unknown
Published: University of New Hampshire Scholars' Repository 2004
Subjects:
HOx
Online Access:https://scholars.unh.edu/earthsci_facpub/28
https://doi.org/10.1016/j.atmosenv.2003.07.018
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spelling 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
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