Climate sensitivity of the century-scale hydrogen peroxide (H2O2) record preserved in 23 ice cores from West Antarctica
[1] We report new century-scale ice core records of hydrogen peroxide (H2O2), a major atmospheric oxidant, from 23 locations across the West Antarctic Ice Sheet (WAIS) and use the spatial variability of (multi-) annual mean H2O2 concentrations in snow and firn to investigate the sensitivity of ice c...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.517.6319 2023-05-15T13:40:47+02:00 Climate sensitivity of the century-scale hydrogen peroxide (H2O2) record preserved in 23 ice cores from West Antarctica Markus M. Frey Roger C. Bales Joseph R. Mcconnell The Pennsylvania State University CiteSeerX Archives 2006 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.6319 http://zero.eng.ucmerced.edu/rcbales/Itase/pdf_docs/Frey_2006JGR.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.6319 http://zero.eng.ucmerced.edu/rcbales/Itase/pdf_docs/Frey_2006JGR.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://zero.eng.ucmerced.edu/rcbales/Itase/pdf_docs/Frey_2006JGR.pdf text 2006 ftciteseerx 2016-01-08T09:56:33Z [1] We report new century-scale ice core records of hydrogen peroxide (H2O2), a major atmospheric oxidant, from 23 locations across the West Antarctic Ice Sheet (WAIS) and use the spatial variability of (multi-) annual mean H2O2 concentrations in snow and firn to investigate the sensitivity of ice core H2O2 preservation to mean annual temperature and accumulation rate. In agreement with the ice-air equilibrium partitioning, H2O2 uptake in near-surface firn was found to be greatest at low temperatures, while postdepositional losses from degassing increase as accumulation rates decrease. This resulted in almost complete loss of H2O2 at warm (>25C), low-accumulation sites (<13 cm yr1), but excellent preservation of records at cold, high-accumulation sites. A two-parameter semiempirical model fitted to the 1911–1960 H2O2 means across all sites predicts>94 % deviations from the ice-air equilibrium at high-accumulation sites (>30 cm yr1), but close-to-equilibrium values on the East Antarctic Plateau, where it is dry (<11 cm yr1). It also estimates a weighted average of the annual atmospheric H2O2 cycle of 1–3 pptv, about 10 % of the levels at the bottom of the H2O2 range observed in winter and early spring in coastal Antarctica. Sensitivities from the model fit Text Antarc* Antarctic Antarctica ice core Ice Sheet West Antarctica Unknown Antarctic West Antarctic Ice Sheet West Antarctica |
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English |
description |
[1] We report new century-scale ice core records of hydrogen peroxide (H2O2), a major atmospheric oxidant, from 23 locations across the West Antarctic Ice Sheet (WAIS) and use the spatial variability of (multi-) annual mean H2O2 concentrations in snow and firn to investigate the sensitivity of ice core H2O2 preservation to mean annual temperature and accumulation rate. In agreement with the ice-air equilibrium partitioning, H2O2 uptake in near-surface firn was found to be greatest at low temperatures, while postdepositional losses from degassing increase as accumulation rates decrease. This resulted in almost complete loss of H2O2 at warm (>25C), low-accumulation sites (<13 cm yr1), but excellent preservation of records at cold, high-accumulation sites. A two-parameter semiempirical model fitted to the 1911–1960 H2O2 means across all sites predicts>94 % deviations from the ice-air equilibrium at high-accumulation sites (>30 cm yr1), but close-to-equilibrium values on the East Antarctic Plateau, where it is dry (<11 cm yr1). It also estimates a weighted average of the annual atmospheric H2O2 cycle of 1–3 pptv, about 10 % of the levels at the bottom of the H2O2 range observed in winter and early spring in coastal Antarctica. Sensitivities from the model fit |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Markus M. Frey Roger C. Bales Joseph R. Mcconnell |
spellingShingle |
Markus M. Frey Roger C. Bales Joseph R. Mcconnell Climate sensitivity of the century-scale hydrogen peroxide (H2O2) record preserved in 23 ice cores from West Antarctica |
author_facet |
Markus M. Frey Roger C. Bales Joseph R. Mcconnell |
author_sort |
Markus M. Frey |
title |
Climate sensitivity of the century-scale hydrogen peroxide (H2O2) record preserved in 23 ice cores from West Antarctica |
title_short |
Climate sensitivity of the century-scale hydrogen peroxide (H2O2) record preserved in 23 ice cores from West Antarctica |
title_full |
Climate sensitivity of the century-scale hydrogen peroxide (H2O2) record preserved in 23 ice cores from West Antarctica |
title_fullStr |
Climate sensitivity of the century-scale hydrogen peroxide (H2O2) record preserved in 23 ice cores from West Antarctica |
title_full_unstemmed |
Climate sensitivity of the century-scale hydrogen peroxide (H2O2) record preserved in 23 ice cores from West Antarctica |
title_sort |
climate sensitivity of the century-scale hydrogen peroxide (h2o2) record preserved in 23 ice cores from west antarctica |
publishDate |
2006 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.6319 http://zero.eng.ucmerced.edu/rcbales/Itase/pdf_docs/Frey_2006JGR.pdf |
geographic |
Antarctic West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic West Antarctic Ice Sheet West Antarctica |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet West Antarctica |
op_source |
http://zero.eng.ucmerced.edu/rcbales/Itase/pdf_docs/Frey_2006JGR.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.6319 http://zero.eng.ucmerced.edu/rcbales/Itase/pdf_docs/Frey_2006JGR.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766139970498592768 |