Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes
Climate change in the Arctic is embedded in the global climate system leading to phenomenon like Arctic Amplification and linkages to the mid-latitudes. A major forcing emerges from changed surface conditions like declining sea ice cover (SIC) and rising sea surface temperatures (SST). We performed...
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ftawi:oai:epic.awi.de:52651 2023-05-15T14:27:38+02:00 Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes Jaiser, Ralf Handorf, Dörthe Akperov, Mirseid Timazhev, Alexander Romanowsky, Erik Mokhov, Igor 2020 https://epic.awi.de/id/eprint/52651/ https://hdl.handle.net/10013/epic.fb7b848b-6a96-4f5d-91f5-896ee37d97ba unknown Jaiser, R. orcid:0000-0002-5685-9637 , Handorf, D. orcid:0000-0002-3305-6882 , Akperov, M. , Timazhev, A. , Romanowsky, E. orcid:0000-0001-6461-7569 and Mokhov, I. (2020) Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes , EGU General Assembly 2020, Online, 4 May 2020 - 8 May 2020 . doi:10.5194/egusphere-egu2020-17763 <https://doi.org/10.5194/egusphere-egu2020-17763> , hdl:10013/epic.fb7b848b-6a96-4f5d-91f5-896ee37d97ba EPIC3EGU General Assembly 2020, Online, 2020-05-04-2020-05-08 Conference notRev 2020 ftawi https://doi.org/10.5194/egusphere-egu2020-17763 2021-12-24T15:45:47Z Climate change in the Arctic is embedded in the global climate system leading to phenomenon like Arctic Amplification and linkages to the mid-latitudes. A major forcing emerges from changed surface conditions like declining sea ice cover (SIC) and rising sea surface temperatures (SST). We performed time-slice model experiments with the global atmosphere-only model ECHAM6 and changed SIC and SST to either high or low states, respectively. These experiments are compared to reanalysis data and analysed aiming at a separation between the influences of SIC and SST, while focusing on linkages between the Arctic and mid-latitudes in winter. We identify five significant regimes in the Atlantic-Eurasian sector with the k-means clustering method. The regimes include different blocking patterns, situation with strong low pressure influence and the North Atlantic Oscillation in its two phases. Their frequency of occurrence is discussed for winter months. In the reanalysis we observe an increase of blocking patterns in early winter of the most recent decades. This is reproduced by our experiments with increased SST, where blocking becomes more dominant overall. In late winter, an increased frequency of occurrence of the North Atlantic Oscillation in its negative phase is observed. This and the overall temporal behaviour of regimes in recent years is best represented if SST and SIC are changed to their more recent state simultaneously. Therefore, our results suggest that increased SSTs and reduced SIC together act on observed linkages between polar regions and mid-latitudes. Conference Object Arctic Arctic Climate change North Atlantic North Atlantic oscillation Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic |
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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 |
Climate change in the Arctic is embedded in the global climate system leading to phenomenon like Arctic Amplification and linkages to the mid-latitudes. A major forcing emerges from changed surface conditions like declining sea ice cover (SIC) and rising sea surface temperatures (SST). We performed time-slice model experiments with the global atmosphere-only model ECHAM6 and changed SIC and SST to either high or low states, respectively. These experiments are compared to reanalysis data and analysed aiming at a separation between the influences of SIC and SST, while focusing on linkages between the Arctic and mid-latitudes in winter. We identify five significant regimes in the Atlantic-Eurasian sector with the k-means clustering method. The regimes include different blocking patterns, situation with strong low pressure influence and the North Atlantic Oscillation in its two phases. Their frequency of occurrence is discussed for winter months. In the reanalysis we observe an increase of blocking patterns in early winter of the most recent decades. This is reproduced by our experiments with increased SST, where blocking becomes more dominant overall. In late winter, an increased frequency of occurrence of the North Atlantic Oscillation in its negative phase is observed. This and the overall temporal behaviour of regimes in recent years is best represented if SST and SIC are changed to their more recent state simultaneously. Therefore, our results suggest that increased SSTs and reduced SIC together act on observed linkages between polar regions and mid-latitudes. |
format |
Conference Object |
author |
Jaiser, Ralf Handorf, Dörthe Akperov, Mirseid Timazhev, Alexander Romanowsky, Erik Mokhov, Igor |
spellingShingle |
Jaiser, Ralf Handorf, Dörthe Akperov, Mirseid Timazhev, Alexander Romanowsky, Erik Mokhov, Igor Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes |
author_facet |
Jaiser, Ralf Handorf, Dörthe Akperov, Mirseid Timazhev, Alexander Romanowsky, Erik Mokhov, Igor |
author_sort |
Jaiser, Ralf |
title |
Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes |
title_short |
Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes |
title_full |
Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes |
title_fullStr |
Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes |
title_full_unstemmed |
Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes |
title_sort |
regime behaviour in the atlantic-eurasian arctic related to sea ice and sea surface temperature changes |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/52651/ https://hdl.handle.net/10013/epic.fb7b848b-6a96-4f5d-91f5-896ee37d97ba |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Climate change North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
Arctic Arctic Climate change North Atlantic North Atlantic oscillation Sea ice |
op_source |
EPIC3EGU General Assembly 2020, Online, 2020-05-04-2020-05-08 |
op_relation |
Jaiser, R. orcid:0000-0002-5685-9637 , Handorf, D. orcid:0000-0002-3305-6882 , Akperov, M. , Timazhev, A. , Romanowsky, E. orcid:0000-0001-6461-7569 and Mokhov, I. (2020) Regime behaviour in the Atlantic-Eurasian Arctic related to sea ice and sea surface temperature changes , EGU General Assembly 2020, Online, 4 May 2020 - 8 May 2020 . doi:10.5194/egusphere-egu2020-17763 <https://doi.org/10.5194/egusphere-egu2020-17763> , hdl:10013/epic.fb7b848b-6a96-4f5d-91f5-896ee37d97ba |
op_doi |
https://doi.org/10.5194/egusphere-egu2020-17763 |
_version_ |
1766301475433086976 |