Marine cold air outbreaks in the Barents Sea: dependence on sea-ice based on observations and model simulations
We evaluated the effects of sea ice concentration (SIC) on marine cold air outbreaks (MCAO) in the Barents Sea (BS) based on satellite observations and numerical modeling data. MCAOs were determined through MCAO-index calculated as a difference in vertical potential temperature between the surface a...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5021737 2023-07-30T04:02:35+02:00 Marine cold air outbreaks in the Barents Sea: dependence on sea-ice based on observations and model simulations Narizhnaya, A. Chernokulsky, A. Handorf, D. 2023-07-11 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021737 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-4302 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021737 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-4302 2023-07-16T23:40:25Z We evaluated the effects of sea ice concentration (SIC) on marine cold air outbreaks (MCAO) in the Barents Sea (BS) based on satellite observations and numerical modeling data. MCAOs were determined through MCAO-index calculated as a difference in vertical potential temperature between the surface and 800-hPa level. For the present climate, we used ERA-Interim reanalysis to calculate the MCAO-index and satellite microwave observations to estimate SIC. We also analyzed results of four sensitivity experiments with the atmospheric general circulation model ECHAM6 with different boundary conditions, i.e., with low and high SIC and low and high sea surface temperature (SST). We found a prominent decrease of the MCAO-index over BS in 1979–2018 that indicates the overall weakening of the MCAO intensity, e.g., a statistically significant decrease was revealed for frequency of both moderate and strong MCAOsin winter (down to -5%/decade). Because of SIC decrease during the 1979–2018 period, we found a positive correlation between SIC and the MCAO-index over BS during winter season. For the same season and area, model experiments, however, showed that higher values of the MCAO-index were associated with lower SIC, which implied their negative correlation. In particular, in the south of BS, values of the MCAO-index were up to 30% higher in the low-SIC experiments compared to the high-SIC experiments. The revealed opposite MCAO-SIC relationship in observations and model simulations is likely associated with the lack of changes of greenhouse gases concentration in model experiments. Conference Object Barents Sea Sea ice GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Barents Sea |
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Open Polar |
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GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
We evaluated the effects of sea ice concentration (SIC) on marine cold air outbreaks (MCAO) in the Barents Sea (BS) based on satellite observations and numerical modeling data. MCAOs were determined through MCAO-index calculated as a difference in vertical potential temperature between the surface and 800-hPa level. For the present climate, we used ERA-Interim reanalysis to calculate the MCAO-index and satellite microwave observations to estimate SIC. We also analyzed results of four sensitivity experiments with the atmospheric general circulation model ECHAM6 with different boundary conditions, i.e., with low and high SIC and low and high sea surface temperature (SST). We found a prominent decrease of the MCAO-index over BS in 1979–2018 that indicates the overall weakening of the MCAO intensity, e.g., a statistically significant decrease was revealed for frequency of both moderate and strong MCAOsin winter (down to -5%/decade). Because of SIC decrease during the 1979–2018 period, we found a positive correlation between SIC and the MCAO-index over BS during winter season. For the same season and area, model experiments, however, showed that higher values of the MCAO-index were associated with lower SIC, which implied their negative correlation. In particular, in the south of BS, values of the MCAO-index were up to 30% higher in the low-SIC experiments compared to the high-SIC experiments. The revealed opposite MCAO-SIC relationship in observations and model simulations is likely associated with the lack of changes of greenhouse gases concentration in model experiments. |
format |
Conference Object |
author |
Narizhnaya, A. Chernokulsky, A. Handorf, D. |
spellingShingle |
Narizhnaya, A. Chernokulsky, A. Handorf, D. Marine cold air outbreaks in the Barents Sea: dependence on sea-ice based on observations and model simulations |
author_facet |
Narizhnaya, A. Chernokulsky, A. Handorf, D. |
author_sort |
Narizhnaya, A. |
title |
Marine cold air outbreaks in the Barents Sea: dependence on sea-ice based on observations and model simulations |
title_short |
Marine cold air outbreaks in the Barents Sea: dependence on sea-ice based on observations and model simulations |
title_full |
Marine cold air outbreaks in the Barents Sea: dependence on sea-ice based on observations and model simulations |
title_fullStr |
Marine cold air outbreaks in the Barents Sea: dependence on sea-ice based on observations and model simulations |
title_full_unstemmed |
Marine cold air outbreaks in the Barents Sea: dependence on sea-ice based on observations and model simulations |
title_sort |
marine cold air outbreaks in the barents sea: dependence on sea-ice based on observations and model simulations |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021737 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Sea ice |
genre_facet |
Barents Sea Sea ice |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-4302 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021737 |
op_doi |
https://doi.org/10.57757/IUGG23-4302 |
_version_ |
1772813391739486208 |