Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations
Recent studies point to the sensitivity of mid-latitude winter climate to Arctic sea ice variability. However, there remain contradictory results in terms of character and timing of Northern Hemisphere large-scale circulation features to Arctic sea ice changes. This study assesses the impact of real...
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Online Access: | http://hdl.handle.net/2122/15355 https://doi.org/10.1007/s00382-021-05830-9 |
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ftingv:oai:www.earth-prints.org:2122/15355 2023-05-15T14:46:10+02:00 Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations Seidenglanz, Anne Athanasiadis, Panos Ruggieri, Paolo Cvijanovic, Ivana Li, Camille Gualdi, Silvio #PLACEHOLDER_PARENT_METADATA_VALUE# Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia 2021 http://hdl.handle.net/2122/15355 https://doi.org/10.1007/s00382-021-05830-9 en eng Springer Climate Dynamics /57 (2021) 0930-7575 http://hdl.handle.net/2122/15355 doi:10.1007/s00382-021-05830-9 open 01.01. Atmosphere article 2021 ftingv https://doi.org/10.1007/s00382-021-05830-9 2022-07-29T06:08:43Z Recent studies point to the sensitivity of mid-latitude winter climate to Arctic sea ice variability. However, there remain contradictory results in terms of character and timing of Northern Hemisphere large-scale circulation features to Arctic sea ice changes. This study assesses the impact of realistic late autumn eastern Arctic sea ice anomalies on atmospheric wintertime circulation at mid-latitudes, pointing to a hidden potential for seasonal predictability. Using a dynamical seasonal prediction system, an ensemble of seasonal forecast simulations of 23 historical winter seasons is run with reduced November sea ice cover in the Barents-Kara Seas, and is compared to the respective control seasonal hindcast simulations set. A non energy-conserving approach is adopted for achieving the desired sea ice loss, with artificial heat being added conditionally to the ocean surface heat fluxes so as to inhibit the formation of sea ice during November. Our results point to a robust atmospheric circulation response in the North Pacific sector, similar to previous findings on the multidecadal timescale. Specifically, an anticyclonic anomaly at upper and lower levels is identified over the eastern midlatitude North Pacific, leading to dry conditions over the North American southwest coast. The responses are related to a re-organization (weakening) of west-Pacific tropical convection and interactions with the tropical Hadley circulation. A possible interaction of the poleward-shifted Pacific eddy-driven jet stream and the Hadley cell is discussed. The winter circulation response in the Euro-Atlantic sector is ephemeral in character and statistically significant in January only, corroborating previous findings of an intermittent and non-stationary Arctic sea ice-NAO link during boreal winter. These results aid our understanding of the seasonal impacts of reduced eastern Arctic sea ice on the midlatitude atmospheric circulation with implications for seasonal predictability in wintertime. Published 2687–2700 4A. ... Article in Journal/Newspaper Arctic Sea ice Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Arctic Pacific Climate Dynamics 57 9-10 2687 2700 |
institution |
Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
01.01. Atmosphere |
spellingShingle |
01.01. Atmosphere Seidenglanz, Anne Athanasiadis, Panos Ruggieri, Paolo Cvijanovic, Ivana Li, Camille Gualdi, Silvio Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations |
topic_facet |
01.01. Atmosphere |
description |
Recent studies point to the sensitivity of mid-latitude winter climate to Arctic sea ice variability. However, there remain contradictory results in terms of character and timing of Northern Hemisphere large-scale circulation features to Arctic sea ice changes. This study assesses the impact of realistic late autumn eastern Arctic sea ice anomalies on atmospheric wintertime circulation at mid-latitudes, pointing to a hidden potential for seasonal predictability. Using a dynamical seasonal prediction system, an ensemble of seasonal forecast simulations of 23 historical winter seasons is run with reduced November sea ice cover in the Barents-Kara Seas, and is compared to the respective control seasonal hindcast simulations set. A non energy-conserving approach is adopted for achieving the desired sea ice loss, with artificial heat being added conditionally to the ocean surface heat fluxes so as to inhibit the formation of sea ice during November. Our results point to a robust atmospheric circulation response in the North Pacific sector, similar to previous findings on the multidecadal timescale. Specifically, an anticyclonic anomaly at upper and lower levels is identified over the eastern midlatitude North Pacific, leading to dry conditions over the North American southwest coast. The responses are related to a re-organization (weakening) of west-Pacific tropical convection and interactions with the tropical Hadley circulation. A possible interaction of the poleward-shifted Pacific eddy-driven jet stream and the Hadley cell is discussed. The winter circulation response in the Euro-Atlantic sector is ephemeral in character and statistically significant in January only, corroborating previous findings of an intermittent and non-stationary Arctic sea ice-NAO link during boreal winter. These results aid our understanding of the seasonal impacts of reduced eastern Arctic sea ice on the midlatitude atmospheric circulation with implications for seasonal predictability in wintertime. Published 2687–2700 4A. ... |
author2 |
#PLACEHOLDER_PARENT_METADATA_VALUE# Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia |
format |
Article in Journal/Newspaper |
author |
Seidenglanz, Anne Athanasiadis, Panos Ruggieri, Paolo Cvijanovic, Ivana Li, Camille Gualdi, Silvio |
author_facet |
Seidenglanz, Anne Athanasiadis, Panos Ruggieri, Paolo Cvijanovic, Ivana Li, Camille Gualdi, Silvio |
author_sort |
Seidenglanz, Anne |
title |
Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations |
title_short |
Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations |
title_full |
Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations |
title_fullStr |
Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations |
title_full_unstemmed |
Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations |
title_sort |
pacific circulation response to eastern arctic sea ice reduction in seasonal forecast simulations |
publisher |
Springer |
publishDate |
2021 |
url |
http://hdl.handle.net/2122/15355 https://doi.org/10.1007/s00382-021-05830-9 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_relation |
Climate Dynamics /57 (2021) 0930-7575 http://hdl.handle.net/2122/15355 doi:10.1007/s00382-021-05830-9 |
op_rights |
open |
op_doi |
https://doi.org/10.1007/s00382-021-05830-9 |
container_title |
Climate Dynamics |
container_volume |
57 |
container_issue |
9-10 |
container_start_page |
2687 |
op_container_end_page |
2700 |
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1766317415454474240 |