Atmospheric near-surface nitrate at coastal Antarctic sites
Records of atmospheric nitrate were obtained by year-round aerosol sampling at Neumayer and Dumont D'Urville stations, located in the Atlantic and Pacific sector of coastal Antarctica, respectively. Where possible, evaluation of the nitrate records is mainly based on concurrently measured radio...
Published in: | Journal of Geophysical Research: Atmospheres |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
1998
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/505021/ https://nora.nerc.ac.uk/id/eprint/505021/1/jgrd5622.pdf https://doi.org/10.1029/97JD03364 |
id |
ftnerc:oai:nora.nerc.ac.uk:505021 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:505021 2023-05-15T13:48:08+02:00 Atmospheric near-surface nitrate at coastal Antarctic sites Wagenbach, D. Legrand, M. Fischer, H. Pichlmayer, F. Wolff, E. W. 1998 text http://nora.nerc.ac.uk/id/eprint/505021/ https://nora.nerc.ac.uk/id/eprint/505021/1/jgrd5622.pdf https://doi.org/10.1029/97JD03364 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/505021/1/jgrd5622.pdf Wagenbach, D.; Legrand, M.; Fischer, H.; Pichlmayer, F.; Wolff, E. W. 1998 Atmospheric near-surface nitrate at coastal Antarctic sites. Journal of Geophysical Research, 103 (D9). 11007-11020. https://doi.org/10.1029/97JD03364 <https://doi.org/10.1029/97JD03364> Publication - Article PeerReviewed 1998 ftnerc https://doi.org/10.1029/97JD03364 2023-02-04T19:38:42Z Records of atmospheric nitrate were obtained by year-round aerosol sampling at Neumayer and Dumont D'Urville stations, located in the Atlantic and Pacific sector of coastal Antarctica, respectively. Where possible, evaluation of the nitrate records is mainly based on concurrently measured radioisotopes (10Be, 7Be, 210Pb) as well as δ15N in nitrate nitrogen. Observations made at these (and two other coastal Antarctic sites [Savoie et al., 1993]) reveal a uniform nitrate background near 10 ng m−3 persisting throughout coastal Antarctica between approximately April and June. The dominant seasonal nitrate maximum, which occurred between spring and midsummer and ranged from 20 to 70 ng m−3, tended to increase with latitude. An estimate based on Neumayer mineral dust concentrations suggests that an average of less than 5% of the observed atmospheric nitrate load may be associated with continental tropospheric sources, while a separate estimate based on 210Pb records implies a much higher proportion of up to 60%. Stratospheric nitrate influx rates seen at coastal sites, deduced from Neumayer 10Be/7Be records for stratospheric air mass intrusions and from tritium for the sedimentation of polar stratospheric clouds (PSC), exceed the theoretical stratospheric odd nitrogen production rate from N2O oxidation by almost a factor of 5 and are found to be in close agreement with the observed surface nitrate flux, implying again that the continental source contribution is relatively unimportant. Consideration of nitrate reemission from near-surface snow layers reveals a minor effect of this flux on the global Antarctic troposphere but possibly a substantial influence on the nitrate load of a persistent surface inversion layer. Evaluation of the mean seasonal nitrate pattern, based on concurrent 10Be, 210Pb, and δ15N records at Neumayer and on tritium in precipitation at Halley, suggests that the period of significant enhancement above the background mainly reflects inputs of stratospheric nitrate with secondary peaks in winter ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic Neumayer Pacific Dumont d'Urville ENVELOPE(140.017,140.017,-66.667,-66.667) Dumont-d'Urville ENVELOPE(140.013,140.013,-66.667,-66.667) Journal of Geophysical Research: Atmospheres 103 D9 11007 11020 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Records of atmospheric nitrate were obtained by year-round aerosol sampling at Neumayer and Dumont D'Urville stations, located in the Atlantic and Pacific sector of coastal Antarctica, respectively. Where possible, evaluation of the nitrate records is mainly based on concurrently measured radioisotopes (10Be, 7Be, 210Pb) as well as δ15N in nitrate nitrogen. Observations made at these (and two other coastal Antarctic sites [Savoie et al., 1993]) reveal a uniform nitrate background near 10 ng m−3 persisting throughout coastal Antarctica between approximately April and June. The dominant seasonal nitrate maximum, which occurred between spring and midsummer and ranged from 20 to 70 ng m−3, tended to increase with latitude. An estimate based on Neumayer mineral dust concentrations suggests that an average of less than 5% of the observed atmospheric nitrate load may be associated with continental tropospheric sources, while a separate estimate based on 210Pb records implies a much higher proportion of up to 60%. Stratospheric nitrate influx rates seen at coastal sites, deduced from Neumayer 10Be/7Be records for stratospheric air mass intrusions and from tritium for the sedimentation of polar stratospheric clouds (PSC), exceed the theoretical stratospheric odd nitrogen production rate from N2O oxidation by almost a factor of 5 and are found to be in close agreement with the observed surface nitrate flux, implying again that the continental source contribution is relatively unimportant. Consideration of nitrate reemission from near-surface snow layers reveals a minor effect of this flux on the global Antarctic troposphere but possibly a substantial influence on the nitrate load of a persistent surface inversion layer. Evaluation of the mean seasonal nitrate pattern, based on concurrent 10Be, 210Pb, and δ15N records at Neumayer and on tritium in precipitation at Halley, suggests that the period of significant enhancement above the background mainly reflects inputs of stratospheric nitrate with secondary peaks in winter ... |
format |
Article in Journal/Newspaper |
author |
Wagenbach, D. Legrand, M. Fischer, H. Pichlmayer, F. Wolff, E. W. |
spellingShingle |
Wagenbach, D. Legrand, M. Fischer, H. Pichlmayer, F. Wolff, E. W. Atmospheric near-surface nitrate at coastal Antarctic sites |
author_facet |
Wagenbach, D. Legrand, M. Fischer, H. Pichlmayer, F. Wolff, E. W. |
author_sort |
Wagenbach, D. |
title |
Atmospheric near-surface nitrate at coastal Antarctic sites |
title_short |
Atmospheric near-surface nitrate at coastal Antarctic sites |
title_full |
Atmospheric near-surface nitrate at coastal Antarctic sites |
title_fullStr |
Atmospheric near-surface nitrate at coastal Antarctic sites |
title_full_unstemmed |
Atmospheric near-surface nitrate at coastal Antarctic sites |
title_sort |
atmospheric near-surface nitrate at coastal antarctic sites |
publisher |
American Geophysical Union |
publishDate |
1998 |
url |
http://nora.nerc.ac.uk/id/eprint/505021/ https://nora.nerc.ac.uk/id/eprint/505021/1/jgrd5622.pdf https://doi.org/10.1029/97JD03364 |
long_lat |
ENVELOPE(140.017,140.017,-66.667,-66.667) ENVELOPE(140.013,140.013,-66.667,-66.667) |
geographic |
Antarctic Neumayer Pacific Dumont d'Urville Dumont-d'Urville |
geographic_facet |
Antarctic Neumayer Pacific Dumont d'Urville Dumont-d'Urville |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/505021/1/jgrd5622.pdf Wagenbach, D.; Legrand, M.; Fischer, H.; Pichlmayer, F.; Wolff, E. W. 1998 Atmospheric near-surface nitrate at coastal Antarctic sites. Journal of Geophysical Research, 103 (D9). 11007-11020. https://doi.org/10.1029/97JD03364 <https://doi.org/10.1029/97JD03364> |
op_doi |
https://doi.org/10.1029/97JD03364 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
103 |
container_issue |
D9 |
container_start_page |
11007 |
op_container_end_page |
11020 |
_version_ |
1766248744091648000 |