Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability
Abstract We investigate winter Arctic Amplification (AA) on synoptic timescales and at regional scales using a daily version of the Arctic Amplification Index (AAI) and examine causes on a synoptic scale. The persistence, frequency and intensity of high AAI events show significant increases over the...
Published in: | Climate Dynamics |
---|---|
Main Authors: | , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer Science and Business Media LLC
2021
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1007/s00382-020-05485-y http://link.springer.com/content/pdf/10.1007/s00382-020-05485-y.pdf http://link.springer.com/article/10.1007/s00382-020-05485-y/fulltext.html |
id |
crspringernat:10.1007/s00382-020-05485-y |
---|---|
record_format |
openpolar |
spelling |
crspringernat:10.1007/s00382-020-05485-y 2023-05-15T14:36:04+02:00 Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability Hall, Richard J. Hanna, Edward Chen, Linling Research Council of Norway University of Lincoln 2021 http://dx.doi.org/10.1007/s00382-020-05485-y http://link.springer.com/content/pdf/10.1007/s00382-020-05485-y.pdf http://link.springer.com/article/10.1007/s00382-020-05485-y/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Climate Dynamics volume 56, issue 1-2, page 457-473 ISSN 0930-7575 1432-0894 Atmospheric Science journal-article 2021 crspringernat https://doi.org/10.1007/s00382-020-05485-y 2022-01-04T16:58:53Z Abstract We investigate winter Arctic Amplification (AA) on synoptic timescales and at regional scales using a daily version of the Arctic Amplification Index (AAI) and examine causes on a synoptic scale. The persistence, frequency and intensity of high AAI events show significant increases over the Arctic. Similarly, low AAI events are decreasing in frequency, persistence and intensity. In both cases, there are regional variations in these trends, in terms of significance and timing. Significant trends in increasing persistence, frequency and intensity of high AAI events in winter are concentrated in the period 2000–2009, with few significant trends before and after this. There are some decreases in sea-ice concentration in response to synoptic-scale AA events and these AA events can contribute to the decadal trends in AA found in other studies. A sectoral analysis of the Arctic indicates that in the Beaufort–Chukchi and East Siberian–Laptev Seas, synoptic scale high AAI events can be driven by tropical teleconnections while in other Arctic sectors, it is the intrusion of moisture-transporting synoptic cyclones into the Arctic that is most important in synoptic-scale AA. The presence of Rossby wave breaking during high AAI events is indicative of forcing from lower latitudes, modulated by variations in the jet stream. An important conclusion is that the increased persistence, frequency and intensity of synoptic-scale high AAI events make significant contributions to the interannual trend in AA. Article in Journal/Newspaper Arctic Chukchi laptev Sea ice Springer Nature (via Crossref) Arctic Climate Dynamics 56 1-2 457 473 |
institution |
Open Polar |
collection |
Springer Nature (via Crossref) |
op_collection_id |
crspringernat |
language |
English |
topic |
Atmospheric Science |
spellingShingle |
Atmospheric Science Hall, Richard J. Hanna, Edward Chen, Linling Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability |
topic_facet |
Atmospheric Science |
description |
Abstract We investigate winter Arctic Amplification (AA) on synoptic timescales and at regional scales using a daily version of the Arctic Amplification Index (AAI) and examine causes on a synoptic scale. The persistence, frequency and intensity of high AAI events show significant increases over the Arctic. Similarly, low AAI events are decreasing in frequency, persistence and intensity. In both cases, there are regional variations in these trends, in terms of significance and timing. Significant trends in increasing persistence, frequency and intensity of high AAI events in winter are concentrated in the period 2000–2009, with few significant trends before and after this. There are some decreases in sea-ice concentration in response to synoptic-scale AA events and these AA events can contribute to the decadal trends in AA found in other studies. A sectoral analysis of the Arctic indicates that in the Beaufort–Chukchi and East Siberian–Laptev Seas, synoptic scale high AAI events can be driven by tropical teleconnections while in other Arctic sectors, it is the intrusion of moisture-transporting synoptic cyclones into the Arctic that is most important in synoptic-scale AA. The presence of Rossby wave breaking during high AAI events is indicative of forcing from lower latitudes, modulated by variations in the jet stream. An important conclusion is that the increased persistence, frequency and intensity of synoptic-scale high AAI events make significant contributions to the interannual trend in AA. |
author2 |
Research Council of Norway University of Lincoln |
format |
Article in Journal/Newspaper |
author |
Hall, Richard J. Hanna, Edward Chen, Linling |
author_facet |
Hall, Richard J. Hanna, Edward Chen, Linling |
author_sort |
Hall, Richard J. |
title |
Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability |
title_short |
Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability |
title_full |
Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability |
title_fullStr |
Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability |
title_full_unstemmed |
Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability |
title_sort |
winter arctic amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1007/s00382-020-05485-y http://link.springer.com/content/pdf/10.1007/s00382-020-05485-y.pdf http://link.springer.com/article/10.1007/s00382-020-05485-y/fulltext.html |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Chukchi laptev Sea ice |
genre_facet |
Arctic Chukchi laptev Sea ice |
op_source |
Climate Dynamics volume 56, issue 1-2, page 457-473 ISSN 0930-7575 1432-0894 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00382-020-05485-y |
container_title |
Climate Dynamics |
container_volume |
56 |
container_issue |
1-2 |
container_start_page |
457 |
op_container_end_page |
473 |
_version_ |
1766308765044310016 |