Spatial distribution of biogenic sulphur compounds (MSA, nssSO4 2- ) in the northern Victoria Land-Dome C-Wilkes Land area, East Antarctica
AbstractDuring the 1992–2002 Antarctic expeditions, in the framework of the International Trans-Antarctic Expedition (ITASE) project, about 600 sites were sampled (superficial snow, snow pits and firn cores) along traverses in the northern Victoria Land–Dome C–Wilkes Land region. The sites wer...
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ftopenaccessrep:oai:zenodo.org:58408 2024-09-15T17:42:15+00:00 Spatial distribution of biogenic sulphur compounds (MSA, nssSO4 2- ) in the northern Victoria Land-Dome C-Wilkes Land area, East Antarctica Silvia Becagli Marco Proposito Silvia Benassai Roberto Gragnani Olivier Magand Rita Traversi Roberto Udisti 2005-01-01 https://www.openaccessrepository.it/record/58408 https://doi.org/10.3189/172756405781813384 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/58408 doi:10.3189/172756405781813384 info:eu-repo/semantics/openAccess Earth-Surface Processes info:eu-repo/semantics/article publication-article 2005 ftopenaccessrep https://doi.org/10.3189/172756405781813384 2024-07-29T03:27:39Z AbstractDuring the 1992–2002 Antarctic expeditions, in the framework of the International Trans-Antarctic Expedition (ITASE) project, about 600 sites were sampled (superficial snow, snow pits and firn cores) along traverses in the northern Victoria Land–Dome C–Wilkes Land region. The sites were characterized by different geographical (distance from the sea, altitude) and climatological (annual mean accumulation rate, temperature) conditions and were affected by air masses from different marine sectors (Ross Sea, Pacific Ocean). Mean anion and cation contents were calculated at each site, in order to evaluate the spatial distribution of chemical impurities in snow. Here we discuss the distribution of non-sea-salt sulphate (nssSO42–) and of methanesulphonic acid (MSA) mainly originating from atmospheric oxidation of biogenic dimethyl sulphide; these compounds play a key role in climate control processes by acting as cloud condensation nuclei. The spatial distribution of nssSO42– and MSA is discussed as a function of distance from the sea, altitude and accumulation rate. Depositional fluxes of nssSO42– and MSA decrease as a function of distance from the sea, with a higher gradient in the first 200km step. There is an analogous trend with the site altitude, and the first 1600m step is relevant in determining the nssSO42– and MSA content in snow. The nssSO42–/MSA ratio depends on the distance from the sea and the biogenic source strength. At coastal sites, where biogenic inputs are dominant, this ratio is ~2. As biogenic input decreases (low MSA content) inland, the ratio increases, indicating the presence of alternative sources of nssSO42– (crustal, volcanic background) or advection of low-latitude air masses. By plotting total flux as a function of accumulation rate, dry depositional contributions were evaluated for nssSO42– and MSA in the Ross Sea and Pacific Ocean sectors. Non-sea-salt sulphate wet deposition prevails at sites where the accumulation rate (expressed as water equivalent) is ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ross Sea Victoria Land Wilkes Land Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Annals of Glaciology 41 23 31 |
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Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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English |
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Earth-Surface Processes |
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Earth-Surface Processes Silvia Becagli Marco Proposito Silvia Benassai Roberto Gragnani Olivier Magand Rita Traversi Roberto Udisti Spatial distribution of biogenic sulphur compounds (MSA, nssSO4 2- ) in the northern Victoria Land-Dome C-Wilkes Land area, East Antarctica |
topic_facet |
Earth-Surface Processes |
description |
AbstractDuring the 1992–2002 Antarctic expeditions, in the framework of the International Trans-Antarctic Expedition (ITASE) project, about 600 sites were sampled (superficial snow, snow pits and firn cores) along traverses in the northern Victoria Land–Dome C–Wilkes Land region. The sites were characterized by different geographical (distance from the sea, altitude) and climatological (annual mean accumulation rate, temperature) conditions and were affected by air masses from different marine sectors (Ross Sea, Pacific Ocean). Mean anion and cation contents were calculated at each site, in order to evaluate the spatial distribution of chemical impurities in snow. Here we discuss the distribution of non-sea-salt sulphate (nssSO42–) and of methanesulphonic acid (MSA) mainly originating from atmospheric oxidation of biogenic dimethyl sulphide; these compounds play a key role in climate control processes by acting as cloud condensation nuclei. The spatial distribution of nssSO42– and MSA is discussed as a function of distance from the sea, altitude and accumulation rate. Depositional fluxes of nssSO42– and MSA decrease as a function of distance from the sea, with a higher gradient in the first 200km step. There is an analogous trend with the site altitude, and the first 1600m step is relevant in determining the nssSO42– and MSA content in snow. The nssSO42–/MSA ratio depends on the distance from the sea and the biogenic source strength. At coastal sites, where biogenic inputs are dominant, this ratio is ~2. As biogenic input decreases (low MSA content) inland, the ratio increases, indicating the presence of alternative sources of nssSO42– (crustal, volcanic background) or advection of low-latitude air masses. By plotting total flux as a function of accumulation rate, dry depositional contributions were evaluated for nssSO42– and MSA in the Ross Sea and Pacific Ocean sectors. Non-sea-salt sulphate wet deposition prevails at sites where the accumulation rate (expressed as water equivalent) is ... |
format |
Article in Journal/Newspaper |
author |
Silvia Becagli Marco Proposito Silvia Benassai Roberto Gragnani Olivier Magand Rita Traversi Roberto Udisti |
author_facet |
Silvia Becagli Marco Proposito Silvia Benassai Roberto Gragnani Olivier Magand Rita Traversi Roberto Udisti |
author_sort |
Silvia Becagli |
title |
Spatial distribution of biogenic sulphur compounds (MSA, nssSO4 2- ) in the northern Victoria Land-Dome C-Wilkes Land area, East Antarctica |
title_short |
Spatial distribution of biogenic sulphur compounds (MSA, nssSO4 2- ) in the northern Victoria Land-Dome C-Wilkes Land area, East Antarctica |
title_full |
Spatial distribution of biogenic sulphur compounds (MSA, nssSO4 2- ) in the northern Victoria Land-Dome C-Wilkes Land area, East Antarctica |
title_fullStr |
Spatial distribution of biogenic sulphur compounds (MSA, nssSO4 2- ) in the northern Victoria Land-Dome C-Wilkes Land area, East Antarctica |
title_full_unstemmed |
Spatial distribution of biogenic sulphur compounds (MSA, nssSO4 2- ) in the northern Victoria Land-Dome C-Wilkes Land area, East Antarctica |
title_sort |
spatial distribution of biogenic sulphur compounds (msa, nssso4 2- ) in the northern victoria land-dome c-wilkes land area, east antarctica |
publishDate |
2005 |
url |
https://www.openaccessrepository.it/record/58408 https://doi.org/10.3189/172756405781813384 |
genre |
Antarc* Antarctic Antarctica East Antarctica Ross Sea Victoria Land Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ross Sea Victoria Land Wilkes Land |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/58408 doi:10.3189/172756405781813384 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3189/172756405781813384 |
container_title |
Annals of Glaciology |
container_volume |
41 |
container_start_page |
23 |
op_container_end_page |
31 |
_version_ |
1810488765234282496 |