Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica
We quantifed post depositional losses of methanesulfonate (MSA-), nitrate, and chloride at the EPICA drilling site in Dronning Maud Land (DML, 75°S, 0°E). Analyses of four interme-diate deep firn cores and 13 snow pits were considered. We found that about 26±13% of the once deposited nitrate and typ...
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ftawi:oai:epic.awi.de:9351 2023-09-05T13:12:44+02:00 Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica Weller, Rolf Traufetter, F. Fischer, Hubertus Oerter, Hans Piel, C. Miller, Heinrich 2004 application/pdf https://epic.awi.de/id/eprint/9351/ https://epic.awi.de/id/eprint/9351/1/Wel2003b.pdf https://doi.org/10.1029/2003JD004189 https://hdl.handle.net/10013/epic.19861 https://hdl.handle.net/10013/epic.19861.d001 unknown https://epic.awi.de/id/eprint/9351/1/Wel2003b.pdf https://hdl.handle.net/10013/epic.19861.d001 Weller, R. orcid:0000-0003-4880-5572 , Traufetter, F. , Fischer, H. , Oerter, H. , Piel, C. and Miller, H. (2004) Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica , Journal of geophysical research, 109, D07301 . doi:10.1029/2003JD004189 <https://doi.org/10.1029/2003JD004189> , hdl:10013/epic.19861 EPIC3Journal of geophysical research, 109, D07301, ISSN: 0148-0227 Article isiRev 2004 ftawi https://doi.org/10.1029/2003JD004189 2023-08-22T19:48:00Z We quantifed post depositional losses of methanesulfonate (MSA-), nitrate, and chloride at the EPICA drilling site in Dronning Maud Land (DML, 75°S, 0°E). Analyses of four interme-diate deep firn cores and 13 snow pits were considered. We found that about 26±13% of the once deposited nitrate and typically 51±20% of MSA- were lost, while for chloride no signifi-cant depletion could be observed in firn older than one year. Assuming a first order exponen-tial decay rate, the characteristic e-folding time for MSA- is 6.4±3 a and 19±6 a for nitrate. It turns out that for nitrate and MSA- the typical mean concentrations representative for the last 100 years were reached after 5.4 a and 6.5 a, repectively, indicating that beneath a depth of around 1.2-1.4 m post depositional losses can be neglected. With a simple approach we esti-mated the partial pressure of the corresponding free acids MSA, HNO3, and HCl based on Henrys law assuming that ionic impurities of the bulk ice matrix are localised in a quasi brine layer (QBL). From this approach it stands to reason that a nearly quantitative loss of MSA-, NO3-, and Cl- should occur. We suggest that firn metamorphosis and fractional dissolution of electrolytes in in the QBL and the ice matrix are the decisive processes leading to the observed partial losses. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal DML Dronning Maud Land EPICA Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Dronning Maud Land Journal of Geophysical Research 109 D7 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
We quantifed post depositional losses of methanesulfonate (MSA-), nitrate, and chloride at the EPICA drilling site in Dronning Maud Land (DML, 75°S, 0°E). Analyses of four interme-diate deep firn cores and 13 snow pits were considered. We found that about 26±13% of the once deposited nitrate and typically 51±20% of MSA- were lost, while for chloride no signifi-cant depletion could be observed in firn older than one year. Assuming a first order exponen-tial decay rate, the characteristic e-folding time for MSA- is 6.4±3 a and 19±6 a for nitrate. It turns out that for nitrate and MSA- the typical mean concentrations representative for the last 100 years were reached after 5.4 a and 6.5 a, repectively, indicating that beneath a depth of around 1.2-1.4 m post depositional losses can be neglected. With a simple approach we esti-mated the partial pressure of the corresponding free acids MSA, HNO3, and HCl based on Henrys law assuming that ionic impurities of the bulk ice matrix are localised in a quasi brine layer (QBL). From this approach it stands to reason that a nearly quantitative loss of MSA-, NO3-, and Cl- should occur. We suggest that firn metamorphosis and fractional dissolution of electrolytes in in the QBL and the ice matrix are the decisive processes leading to the observed partial losses. |
format |
Article in Journal/Newspaper |
author |
Weller, Rolf Traufetter, F. Fischer, Hubertus Oerter, Hans Piel, C. Miller, Heinrich |
spellingShingle |
Weller, Rolf Traufetter, F. Fischer, Hubertus Oerter, Hans Piel, C. Miller, Heinrich Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica |
author_facet |
Weller, Rolf Traufetter, F. Fischer, Hubertus Oerter, Hans Piel, C. Miller, Heinrich |
author_sort |
Weller, Rolf |
title |
Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica |
title_short |
Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica |
title_full |
Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica |
title_fullStr |
Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica |
title_full_unstemmed |
Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica |
title_sort |
post depositional losses of methane sulfonate, nitrate, and chloride at the epica deep-drilling site in dronning maud land, antarctica |
publishDate |
2004 |
url |
https://epic.awi.de/id/eprint/9351/ https://epic.awi.de/id/eprint/9351/1/Wel2003b.pdf https://doi.org/10.1029/2003JD004189 https://hdl.handle.net/10013/epic.19861 https://hdl.handle.net/10013/epic.19861.d001 |
geographic |
Dronning Maud Land |
geographic_facet |
Dronning Maud Land |
genre |
Antarc* Antarctica Antarctica Journal DML Dronning Maud Land EPICA |
genre_facet |
Antarc* Antarctica Antarctica Journal DML Dronning Maud Land EPICA |
op_source |
EPIC3Journal of geophysical research, 109, D07301, ISSN: 0148-0227 |
op_relation |
https://epic.awi.de/id/eprint/9351/1/Wel2003b.pdf https://hdl.handle.net/10013/epic.19861.d001 Weller, R. orcid:0000-0003-4880-5572 , Traufetter, F. , Fischer, H. , Oerter, H. , Piel, C. and Miller, H. (2004) Post depositional losses of methane sulfonate, nitrate, and chloride at the EPICA deep-drilling site in Dronning Maud Land, Antarctica , Journal of geophysical research, 109, D07301 . doi:10.1029/2003JD004189 <https://doi.org/10.1029/2003JD004189> , hdl:10013/epic.19861 |
op_doi |
https://doi.org/10.1029/2003JD004189 |
container_title |
Journal of Geophysical Research |
container_volume |
109 |
container_issue |
D7 |
_version_ |
1776201537875345408 |