An overview of ISCAT 2000
The Investigation of Sulfur Chemistry in the Antarctic Troposphere (ISCAT) took place over the timer period of 15 November to 31 December in the year 2000. The study location was the Amundsen Scott Station in Antarctica. ISCAT 2000 defines the second phase of a program designed to explore tropospher...
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ftuninhampshire:oai:scholars.unh.edu:earthsci_facpub-1046 2023-05-15T13:24:29+02:00 An overview of ISCAT 2000 Davis, D D Eisele, Fred Chen, G Crawford, J Huey, L Gregory Tanner, D Slusher, D Mauldin, Lee Oncley, S Lenschow, D Semmer, S Shetter, R E Lefer, Barry Arimoto, Richard Hogan, A Grube, P Lazzara, M Bandy, A R Thornton, D C Berresheim, H Bingemer, H Hutterli, Manuel McConnell, J R Bales, R Dibb, Jack E. Buhr, Martin Park, J McMurry, P Swanson, Aaron L Meinardi, Simone Blake, D R 2004-10-01T07:00:00Z text/html https://scholars.unh.edu/earthsci_facpub/47 https://doi.org/10.1016/j.atmosenv.2004.05.037 unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/earthsci_facpub/47 http://dx.doi.org/10.1016/j.atmosenv.2004.05.037 Copyright © 2004 Elsevier Ltd. All rights reserved. Earth Sciences Scholarship Antarctica South Pole Photochemistry Snow emissions ISCAT Overview Atmospheric Sciences text 2004 ftuninhampshire https://doi.org/10.1016/j.atmosenv.2004.05.037 2023-01-30T21:34:09Z The Investigation of Sulfur Chemistry in the Antarctic Troposphere (ISCAT) took place over the timer period of 15 November to 31 December in the year 2000. The study location was the Amundsen Scott Station in Antarctica. ISCAT 2000 defines the second phase of a program designed to explore tropospheric chemistry in Antarctica. As in 1998, the 2000 ISCAT study revealed a strong oxidizing environment at South Pole (SP). During the 2000 investigation, however, the suite of measurements was greatly expanded. These new measurements established the recycling of reactive nitrogen as a critical component of this unique environment. This paper first presents the historical background leading up to the ISCAT 2000 observations; then it focuses on providing a summary of the year 2000 results and contrasts these with those recorded during 1998. Important developments made during the 2000 study included the recording of SP data for several species being emitted from the snowpack. These included NO, H2O2 and CH2O. In this context, eddy-diffusion flux measurements provided the first quantitative estimates of the SP NO and NOx snow-to-atmosphere fluxes. This study also revealed that HNO3 and HO2NO2 were major sink species for HOx and NOx radicals. And, it identified the critical factors responsible for SP NO levels exceeding those at other polar sites by nearly an order of magnitude. Finally, it reports on the levels of gas phase sulfur species and provides evidence indicating that the absence of DMS at SP is most likely due to its greatly shorten chemical lifetime in the near vicinity of the plateau. It is proposed that this is due to the influence of NO on the distribution of OH in the lower free troposphere over a region that extends well beyond the plateau itself. Details related to each of the above findings plus others can be found in the 11 accompanying Special Issue papers. Text Amundsen-Scott Antarc* Antarctic Antarctica South pole South pole University of New Hampshire: Scholars Repository Antarctic The Antarctic South Pole Amundsen-Scott ENVELOPE(0.000,0.000,-90.000,-90.000) Atmospheric Environment 38 32 5363 5373 |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
topic |
Antarctica South Pole Photochemistry Snow emissions ISCAT Overview Atmospheric Sciences |
spellingShingle |
Antarctica South Pole Photochemistry Snow emissions ISCAT Overview Atmospheric Sciences Davis, D D Eisele, Fred Chen, G Crawford, J Huey, L Gregory Tanner, D Slusher, D Mauldin, Lee Oncley, S Lenschow, D Semmer, S Shetter, R E Lefer, Barry Arimoto, Richard Hogan, A Grube, P Lazzara, M Bandy, A R Thornton, D C Berresheim, H Bingemer, H Hutterli, Manuel McConnell, J R Bales, R Dibb, Jack E. Buhr, Martin Park, J McMurry, P Swanson, Aaron L Meinardi, Simone Blake, D R An overview of ISCAT 2000 |
topic_facet |
Antarctica South Pole Photochemistry Snow emissions ISCAT Overview Atmospheric Sciences |
description |
The Investigation of Sulfur Chemistry in the Antarctic Troposphere (ISCAT) took place over the timer period of 15 November to 31 December in the year 2000. The study location was the Amundsen Scott Station in Antarctica. ISCAT 2000 defines the second phase of a program designed to explore tropospheric chemistry in Antarctica. As in 1998, the 2000 ISCAT study revealed a strong oxidizing environment at South Pole (SP). During the 2000 investigation, however, the suite of measurements was greatly expanded. These new measurements established the recycling of reactive nitrogen as a critical component of this unique environment. This paper first presents the historical background leading up to the ISCAT 2000 observations; then it focuses on providing a summary of the year 2000 results and contrasts these with those recorded during 1998. Important developments made during the 2000 study included the recording of SP data for several species being emitted from the snowpack. These included NO, H2O2 and CH2O. In this context, eddy-diffusion flux measurements provided the first quantitative estimates of the SP NO and NOx snow-to-atmosphere fluxes. This study also revealed that HNO3 and HO2NO2 were major sink species for HOx and NOx radicals. And, it identified the critical factors responsible for SP NO levels exceeding those at other polar sites by nearly an order of magnitude. Finally, it reports on the levels of gas phase sulfur species and provides evidence indicating that the absence of DMS at SP is most likely due to its greatly shorten chemical lifetime in the near vicinity of the plateau. It is proposed that this is due to the influence of NO on the distribution of OH in the lower free troposphere over a region that extends well beyond the plateau itself. Details related to each of the above findings plus others can be found in the 11 accompanying Special Issue papers. |
format |
Text |
author |
Davis, D D Eisele, Fred Chen, G Crawford, J Huey, L Gregory Tanner, D Slusher, D Mauldin, Lee Oncley, S Lenschow, D Semmer, S Shetter, R E Lefer, Barry Arimoto, Richard Hogan, A Grube, P Lazzara, M Bandy, A R Thornton, D C Berresheim, H Bingemer, H Hutterli, Manuel McConnell, J R Bales, R Dibb, Jack E. Buhr, Martin Park, J McMurry, P Swanson, Aaron L Meinardi, Simone Blake, D R |
author_facet |
Davis, D D Eisele, Fred Chen, G Crawford, J Huey, L Gregory Tanner, D Slusher, D Mauldin, Lee Oncley, S Lenschow, D Semmer, S Shetter, R E Lefer, Barry Arimoto, Richard Hogan, A Grube, P Lazzara, M Bandy, A R Thornton, D C Berresheim, H Bingemer, H Hutterli, Manuel McConnell, J R Bales, R Dibb, Jack E. Buhr, Martin Park, J McMurry, P Swanson, Aaron L Meinardi, Simone Blake, D R |
author_sort |
Davis, D D |
title |
An overview of ISCAT 2000 |
title_short |
An overview of ISCAT 2000 |
title_full |
An overview of ISCAT 2000 |
title_fullStr |
An overview of ISCAT 2000 |
title_full_unstemmed |
An overview of ISCAT 2000 |
title_sort |
overview of iscat 2000 |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2004 |
url |
https://scholars.unh.edu/earthsci_facpub/47 https://doi.org/10.1016/j.atmosenv.2004.05.037 |
long_lat |
ENVELOPE(0.000,0.000,-90.000,-90.000) |
geographic |
Antarctic The Antarctic South Pole Amundsen-Scott |
geographic_facet |
Antarctic The Antarctic South Pole Amundsen-Scott |
genre |
Amundsen-Scott Antarc* Antarctic Antarctica South pole South pole |
genre_facet |
Amundsen-Scott Antarc* Antarctic Antarctica South pole South pole |
op_source |
Earth Sciences Scholarship |
op_relation |
https://scholars.unh.edu/earthsci_facpub/47 http://dx.doi.org/10.1016/j.atmosenv.2004.05.037 |
op_rights |
Copyright © 2004 Elsevier Ltd. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.atmosenv.2004.05.037 |
container_title |
Atmospheric Environment |
container_volume |
38 |
container_issue |
32 |
container_start_page |
5363 |
op_container_end_page |
5373 |
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1766379921719951360 |