Large-scale temperature and salinity changes in the upper Canadian Basin of the Arctic Ocean at a time of a drastic Arctic Oscillation inversion
Between 2008 and 2010, the Arctic Oscillation index over Arctic regions shifted from positive values corresponding to more cyclonic conditions prevailing during the 4th International Polar Year (IPY) period (2007–2008) to extremely negative values corresponding to strong anticyclonic conditions in 2...
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ftdoajarticles:oai:doaj.org/article:5d53cbe0f3c0460686244fe7f7b499bf 2023-05-15T13:11:25+02:00 Large-scale temperature and salinity changes in the upper Canadian Basin of the Arctic Ocean at a time of a drastic Arctic Oscillation inversion P. Bourgain J. C. Gascard J. Shi J. Zhao 2013-04-01T00:00:00Z https://doi.org/10.5194/os-9-447-2013 https://doaj.org/article/5d53cbe0f3c0460686244fe7f7b499bf EN eng Copernicus Publications http://www.ocean-sci.net/9/447/2013/os-9-447-2013.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-9-447-2013 1812-0784 1812-0792 https://doaj.org/article/5d53cbe0f3c0460686244fe7f7b499bf Ocean Science, Vol 9, Iss 2, Pp 447-460 (2013) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2013 ftdoajarticles https://doi.org/10.5194/os-9-447-2013 2022-12-31T10:27:44Z Between 2008 and 2010, the Arctic Oscillation index over Arctic regions shifted from positive values corresponding to more cyclonic conditions prevailing during the 4th International Polar Year (IPY) period (2007–2008) to extremely negative values corresponding to strong anticyclonic conditions in 2010. In this context, we investigated the recent large-scale evolution of the upper western Arctic Ocean, based on temperature and salinity summertime observations collected during icebreaker campaigns and from ice-tethered profilers (ITPs) drifting across the region in 2008 and 2010. Particularly, we focused on (1) the freshwater content which was extensively studied during previous years, (2) the near-surface temperature maximum due to incoming solar radiation, and (3) the water masses advected from the Pacific Ocean into the Arctic Ocean. The observations revealed a freshwater content change in the Canadian Basin during this time period. South of 80° N, the freshwater content increased, while north of 80° N, less freshening occurred in 2010 compared to 2008. This was more likely due to the strong anticyclonicity characteristic of a low AO index mode that enhanced both a wind-generated Ekman pumping in the Beaufort Gyre and a possible diversion of the Siberian River runoff toward the Eurasian Basin at the same time. The near-surface temperature maximum due to incoming solar radiation was almost 1 °C colder in the southern Canada Basin (south of 75° N) in 2010 compared to 2008, which contrasted with the positive trend observed during previous years. This was more likely due to higher summer sea ice concentration in 2010 compared to 2008 in that region, and surface albedo feedback reflecting more sun radiation back in space. The Pacific water (PaW) was also subjected to strong spatial and temporal variability between 2008 and 2010. In the Canada Basin, both summer and winter PaW signatures were stronger between 75° N and 80° N. This was more likely due to a strong recirculation within the Beaufort Gyre. In contrast, ... Article in Journal/Newspaper albedo Arctic Arctic Ocean canada basin International Polar Year IPY Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Canada Pacific Ocean Science 9 2 447 460 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 P. Bourgain J. C. Gascard J. Shi J. Zhao Large-scale temperature and salinity changes in the upper Canadian Basin of the Arctic Ocean at a time of a drastic Arctic Oscillation inversion |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
Between 2008 and 2010, the Arctic Oscillation index over Arctic regions shifted from positive values corresponding to more cyclonic conditions prevailing during the 4th International Polar Year (IPY) period (2007–2008) to extremely negative values corresponding to strong anticyclonic conditions in 2010. In this context, we investigated the recent large-scale evolution of the upper western Arctic Ocean, based on temperature and salinity summertime observations collected during icebreaker campaigns and from ice-tethered profilers (ITPs) drifting across the region in 2008 and 2010. Particularly, we focused on (1) the freshwater content which was extensively studied during previous years, (2) the near-surface temperature maximum due to incoming solar radiation, and (3) the water masses advected from the Pacific Ocean into the Arctic Ocean. The observations revealed a freshwater content change in the Canadian Basin during this time period. South of 80° N, the freshwater content increased, while north of 80° N, less freshening occurred in 2010 compared to 2008. This was more likely due to the strong anticyclonicity characteristic of a low AO index mode that enhanced both a wind-generated Ekman pumping in the Beaufort Gyre and a possible diversion of the Siberian River runoff toward the Eurasian Basin at the same time. The near-surface temperature maximum due to incoming solar radiation was almost 1 °C colder in the southern Canada Basin (south of 75° N) in 2010 compared to 2008, which contrasted with the positive trend observed during previous years. This was more likely due to higher summer sea ice concentration in 2010 compared to 2008 in that region, and surface albedo feedback reflecting more sun radiation back in space. The Pacific water (PaW) was also subjected to strong spatial and temporal variability between 2008 and 2010. In the Canada Basin, both summer and winter PaW signatures were stronger between 75° N and 80° N. This was more likely due to a strong recirculation within the Beaufort Gyre. In contrast, ... |
format |
Article in Journal/Newspaper |
author |
P. Bourgain J. C. Gascard J. Shi J. Zhao |
author_facet |
P. Bourgain J. C. Gascard J. Shi J. Zhao |
author_sort |
P. Bourgain |
title |
Large-scale temperature and salinity changes in the upper Canadian Basin of the Arctic Ocean at a time of a drastic Arctic Oscillation inversion |
title_short |
Large-scale temperature and salinity changes in the upper Canadian Basin of the Arctic Ocean at a time of a drastic Arctic Oscillation inversion |
title_full |
Large-scale temperature and salinity changes in the upper Canadian Basin of the Arctic Ocean at a time of a drastic Arctic Oscillation inversion |
title_fullStr |
Large-scale temperature and salinity changes in the upper Canadian Basin of the Arctic Ocean at a time of a drastic Arctic Oscillation inversion |
title_full_unstemmed |
Large-scale temperature and salinity changes in the upper Canadian Basin of the Arctic Ocean at a time of a drastic Arctic Oscillation inversion |
title_sort |
large-scale temperature and salinity changes in the upper canadian basin of the arctic ocean at a time of a drastic arctic oscillation inversion |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/os-9-447-2013 https://doaj.org/article/5d53cbe0f3c0460686244fe7f7b499bf |
geographic |
Arctic Arctic Ocean Canada Pacific |
geographic_facet |
Arctic Arctic Ocean Canada Pacific |
genre |
albedo Arctic Arctic Ocean canada basin International Polar Year IPY Sea ice |
genre_facet |
albedo Arctic Arctic Ocean canada basin International Polar Year IPY Sea ice |
op_source |
Ocean Science, Vol 9, Iss 2, Pp 447-460 (2013) |
op_relation |
http://www.ocean-sci.net/9/447/2013/os-9-447-2013.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-9-447-2013 1812-0784 1812-0792 https://doaj.org/article/5d53cbe0f3c0460686244fe7f7b499bf |
op_doi |
https://doi.org/10.5194/os-9-447-2013 |
container_title |
Ocean Science |
container_volume |
9 |
container_issue |
2 |
container_start_page |
447 |
op_container_end_page |
460 |
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1766247341399998464 |