Polychlorinated biphenyls in a temperate Alpine glacier: 1. Effect of percolating meltwater on their distribution in glacier ice
In Alpine regions, glaciers act as environmental archives and can accumulate significant amounts of atmospherically derived pollutants. Due to the current climate-warming-induced accelerated melting, these pollutants are being released at correspondingly higher rates. To examine the effect of meltin...
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American Chemical Society
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Online Access: | https://doi.org/10.1021/acs.est.5b03303 |
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ftempa:oai:dora:empa_15119 2023-05-15T16:38:37+02:00 Polychlorinated biphenyls in a temperate Alpine glacier: 1. Effect of percolating meltwater on their distribution in glacier ice Pavlova, Pavlina Aneva Jenk, Theo Manuel Schmid, Peter Bogdal, Christian Steinlin, Christine Schwikowski, Margit 2015 https://doi.org/10.1021/acs.est.5b03303 eng eng American Chemical Society Environmental Science and Technology--Environ. Sci. Technol.--journals:872--0013-936X--1520-5851 empa:15119 journal id: journals:872 issn: 0013-936X e-issn: 1520-5851 ut: 000366872300024 scopus: 2-s2.0-84950130442 doi:10.1021/acs.est.5b03303 Text Journal Article 2015 ftempa https://doi.org/10.1021/acs.est.5b03303 2023-03-04T17:15:49Z In Alpine regions, glaciers act as environmental archives and can accumulate significant amounts of atmospherically derived pollutants. Due to the current climate-warming-induced accelerated melting, these pollutants are being released at correspondingly higher rates. To examine the effect of melting on the redistribution of legacy pollutants in Alpine glaciers, we analyzed polychlorinated biphenyls in an ice core from the temperate Silvretta glacier, located in eastern Switzerland. This glacier is affected by surface melting in summer. As a result, liquid water percolates down and particles are enriched in the current annual surface layer. Dating the ice core was a challenge because meltwater percolation also affects the traditionally used parameters. Instead, we counted annual layers of particulate black carbon in the ice core, adding the years with negative glacier mass balance, that is, years with melting and subsequent loss of the entire annual snow accumulation. The analyzed samples cover the time period 1930–2011. The concentration of indicator PCBs (iPCBs) in the Silvretta ice core follows the emission history, peaking in the 1970s (2.5 ng/L). High PCB values in the 1990s and 1930s are attributed to meltwater-induced relocation within the glacier. The total iPCB load at the Silvretta ice core site is 5 ng/cm 2 . A significant amount of the total PCB burden in the Silvretta glacier has been released to the environment. Article in Journal/Newspaper ice core DORA Empa Environmental Science & Technology 49 24 14085 14091 |
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English |
description |
In Alpine regions, glaciers act as environmental archives and can accumulate significant amounts of atmospherically derived pollutants. Due to the current climate-warming-induced accelerated melting, these pollutants are being released at correspondingly higher rates. To examine the effect of melting on the redistribution of legacy pollutants in Alpine glaciers, we analyzed polychlorinated biphenyls in an ice core from the temperate Silvretta glacier, located in eastern Switzerland. This glacier is affected by surface melting in summer. As a result, liquid water percolates down and particles are enriched in the current annual surface layer. Dating the ice core was a challenge because meltwater percolation also affects the traditionally used parameters. Instead, we counted annual layers of particulate black carbon in the ice core, adding the years with negative glacier mass balance, that is, years with melting and subsequent loss of the entire annual snow accumulation. The analyzed samples cover the time period 1930–2011. The concentration of indicator PCBs (iPCBs) in the Silvretta ice core follows the emission history, peaking in the 1970s (2.5 ng/L). High PCB values in the 1990s and 1930s are attributed to meltwater-induced relocation within the glacier. The total iPCB load at the Silvretta ice core site is 5 ng/cm 2 . A significant amount of the total PCB burden in the Silvretta glacier has been released to the environment. |
format |
Article in Journal/Newspaper |
author |
Pavlova, Pavlina Aneva Jenk, Theo Manuel Schmid, Peter Bogdal, Christian Steinlin, Christine Schwikowski, Margit |
spellingShingle |
Pavlova, Pavlina Aneva Jenk, Theo Manuel Schmid, Peter Bogdal, Christian Steinlin, Christine Schwikowski, Margit Polychlorinated biphenyls in a temperate Alpine glacier: 1. Effect of percolating meltwater on their distribution in glacier ice |
author_facet |
Pavlova, Pavlina Aneva Jenk, Theo Manuel Schmid, Peter Bogdal, Christian Steinlin, Christine Schwikowski, Margit |
author_sort |
Pavlova, Pavlina Aneva |
title |
Polychlorinated biphenyls in a temperate Alpine glacier: 1. Effect of percolating meltwater on their distribution in glacier ice |
title_short |
Polychlorinated biphenyls in a temperate Alpine glacier: 1. Effect of percolating meltwater on their distribution in glacier ice |
title_full |
Polychlorinated biphenyls in a temperate Alpine glacier: 1. Effect of percolating meltwater on their distribution in glacier ice |
title_fullStr |
Polychlorinated biphenyls in a temperate Alpine glacier: 1. Effect of percolating meltwater on their distribution in glacier ice |
title_full_unstemmed |
Polychlorinated biphenyls in a temperate Alpine glacier: 1. Effect of percolating meltwater on their distribution in glacier ice |
title_sort |
polychlorinated biphenyls in a temperate alpine glacier: 1. effect of percolating meltwater on their distribution in glacier ice |
publisher |
American Chemical Society |
publishDate |
2015 |
url |
https://doi.org/10.1021/acs.est.5b03303 |
genre |
ice core |
genre_facet |
ice core |
op_relation |
Environmental Science and Technology--Environ. Sci. Technol.--journals:872--0013-936X--1520-5851 empa:15119 journal id: journals:872 issn: 0013-936X e-issn: 1520-5851 ut: 000366872300024 scopus: 2-s2.0-84950130442 doi:10.1021/acs.est.5b03303 |
op_doi |
https://doi.org/10.1021/acs.est.5b03303 |
container_title |
Environmental Science & Technology |
container_volume |
49 |
container_issue |
24 |
container_start_page |
14085 |
op_container_end_page |
14091 |
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1766028932864278528 |