Chemical and isotopic snow variability along the 1998 ITASE traverse from Terra Nova Bay to Dome C, East Antarctica
In the framework of the PNRA-ITASE (Programma Nazionale di Ricerche in Antartide-International Trans-Antarctic Scientific Expedition) project, during the field season 1998/99, surface snow (1 m cores and pits) and shallow firn cores (10-50 m) were collected along a traverse from Terra Nova Bay (nort...
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ftunivroma3iris:oai:iris.uniroma3.it:11590/353627 2024-02-11T09:58:26+01:00 Chemical and isotopic snow variability along the 1998 ITASE traverse from Terra Nova Bay to Dome C, East Antarctica Proposito M. Becagli S. Castellano E. Flora O. Genoni L. Gragnani R. Stenni B. Traversi R. Udisti R. Frezzotti M. Proposito, M. Becagli, S. Castellano, E. Flora, O. Genoni, L. Gragnani, R. Stenni, B. Traversi, R. Udisti, R. Frezzotti, M. 2002 http://hdl.handle.net/11590/353627 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000182023600032 volume:35 firstpage:187 lastpage:194 numberofpages:8 journal:ANNALS OF GLACIOLOGY http://hdl.handle.net/11590/353627 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-12444255276 info:eu-repo/semantics/article 2002 ftunivroma3iris 2024-01-24T17:41:56Z In the framework of the PNRA-ITASE (Programma Nazionale di Ricerche in Antartide-International Trans-Antarctic Scientific Expedition) project, during the field season 1998/99, surface snow (1 m cores and pits) and shallow firn cores (10-50 m) were collected along a traverse from Terra Nova Bay (northern Victoria Land) to Dome C (East Antarctic ice sheet). Results of chemical, tritium and stable-isotope composition are presented here for the 1 m cores, some snow pits and the first 2 m of some shallow firn cores. The δ18O values show a regular trend with altitude, and the regression line between δ18O and surface temperature is δ18O = 0.99T (°C) - 0.67. Primary aerosol components such as Na+, Cl-, Ca2+, Mg2+ and K+ show high concentrations decreasing with increasing altitude in the first 250-350 km from the coast. At greater distances, concentrations of these species remain more constant. NO3- concentration shows an irregular profile with a progressive decreasing trend as altitude increases. Non-sea-salt (nss) SO42- concentration decreases up to about 250 km from the coast, increases 250-770 km from the coast and remains relatively constant in the most remote stations. Methanesulphonate (MSA concentration shows high variability. The MSA/nssSO42- ratio exhibits a decreasing trend 250-550 km from the coast. With increasing distance, the ratio shows moderate oscillations. nssCl- concentration shows a progressive increase as distance from the coast increases, in agreement with the increasing influence of HCl on the Cl- budget of the inland Antarctic atmosphere. Post-depositional re-emissions of Cl- and NO3- were found at stations characterized at the surface by long-term accumulation hiatus (wind crusts). The chemical-species distribution is consistent with the presence in the studied area of local and long-range transport processes, post-depositional effects and snow-accumulation variations observed along the traverse. Article in Journal/Newspaper Antarc* Antarctic Antarctica Antartide East Antarctica Ice Sheet Victoria Land Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) Antarctic East Antarctica Victoria Land East Antarctic Ice Sheet Terra Nova Bay |
institution |
Open Polar |
collection |
Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) |
op_collection_id |
ftunivroma3iris |
language |
English |
description |
In the framework of the PNRA-ITASE (Programma Nazionale di Ricerche in Antartide-International Trans-Antarctic Scientific Expedition) project, during the field season 1998/99, surface snow (1 m cores and pits) and shallow firn cores (10-50 m) were collected along a traverse from Terra Nova Bay (northern Victoria Land) to Dome C (East Antarctic ice sheet). Results of chemical, tritium and stable-isotope composition are presented here for the 1 m cores, some snow pits and the first 2 m of some shallow firn cores. The δ18O values show a regular trend with altitude, and the regression line between δ18O and surface temperature is δ18O = 0.99T (°C) - 0.67. Primary aerosol components such as Na+, Cl-, Ca2+, Mg2+ and K+ show high concentrations decreasing with increasing altitude in the first 250-350 km from the coast. At greater distances, concentrations of these species remain more constant. NO3- concentration shows an irregular profile with a progressive decreasing trend as altitude increases. Non-sea-salt (nss) SO42- concentration decreases up to about 250 km from the coast, increases 250-770 km from the coast and remains relatively constant in the most remote stations. Methanesulphonate (MSA concentration shows high variability. The MSA/nssSO42- ratio exhibits a decreasing trend 250-550 km from the coast. With increasing distance, the ratio shows moderate oscillations. nssCl- concentration shows a progressive increase as distance from the coast increases, in agreement with the increasing influence of HCl on the Cl- budget of the inland Antarctic atmosphere. Post-depositional re-emissions of Cl- and NO3- were found at stations characterized at the surface by long-term accumulation hiatus (wind crusts). The chemical-species distribution is consistent with the presence in the studied area of local and long-range transport processes, post-depositional effects and snow-accumulation variations observed along the traverse. |
author2 |
Proposito, M. Becagli, S. Castellano, E. Flora, O. Genoni, L. Gragnani, R. Stenni, B. Traversi, R. Udisti, R. Frezzotti, M. |
format |
Article in Journal/Newspaper |
author |
Proposito M. Becagli S. Castellano E. Flora O. Genoni L. Gragnani R. Stenni B. Traversi R. Udisti R. Frezzotti M. |
spellingShingle |
Proposito M. Becagli S. Castellano E. Flora O. Genoni L. Gragnani R. Stenni B. Traversi R. Udisti R. Frezzotti M. Chemical and isotopic snow variability along the 1998 ITASE traverse from Terra Nova Bay to Dome C, East Antarctica |
author_facet |
Proposito M. Becagli S. Castellano E. Flora O. Genoni L. Gragnani R. Stenni B. Traversi R. Udisti R. Frezzotti M. |
author_sort |
Proposito M. |
title |
Chemical and isotopic snow variability along the 1998 ITASE traverse from Terra Nova Bay to Dome C, East Antarctica |
title_short |
Chemical and isotopic snow variability along the 1998 ITASE traverse from Terra Nova Bay to Dome C, East Antarctica |
title_full |
Chemical and isotopic snow variability along the 1998 ITASE traverse from Terra Nova Bay to Dome C, East Antarctica |
title_fullStr |
Chemical and isotopic snow variability along the 1998 ITASE traverse from Terra Nova Bay to Dome C, East Antarctica |
title_full_unstemmed |
Chemical and isotopic snow variability along the 1998 ITASE traverse from Terra Nova Bay to Dome C, East Antarctica |
title_sort |
chemical and isotopic snow variability along the 1998 itase traverse from terra nova bay to dome c, east antarctica |
publishDate |
2002 |
url |
http://hdl.handle.net/11590/353627 |
geographic |
Antarctic East Antarctica Victoria Land East Antarctic Ice Sheet Terra Nova Bay |
geographic_facet |
Antarctic East Antarctica Victoria Land East Antarctic Ice Sheet Terra Nova Bay |
genre |
Antarc* Antarctic Antarctica Antartide East Antarctica Ice Sheet Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Antartide East Antarctica Ice Sheet Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000182023600032 volume:35 firstpage:187 lastpage:194 numberofpages:8 journal:ANNALS OF GLACIOLOGY http://hdl.handle.net/11590/353627 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-12444255276 |
_version_ |
1790594084322148352 |