Duration and decay of Arctic stratospheric vortex events in the ECMWF seasonal forecast model
Previous studies have documented extreme stratospheric polar vortex events, but the factors governing their duration have received little attention. Here, we investigate weak and strong stratospheric polar vortex events simulated in ensemble reforecasts for the Northern Hemisphere winter with the se...
Published in: | Quarterly Journal of the Royal Meteorological Society |
---|---|
Main Authors: | , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2018
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/qj.3417 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.3417 https://onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3417 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/qj.3417 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002/qj.3417 https://rmets.onlinelibrary.wiley.com/doi/am-pdf/10.1002/qj.3417 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3417 |
id |
crwiley:10.1002/qj.3417 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/qj.3417 2024-09-09T19:27:27+00:00 Duration and decay of Arctic stratospheric vortex events in the ECMWF seasonal forecast model Orsolini, Yvan J. Nishii, Kazuaki Nakamura, Hisashi Japan Science and Technology Agency Ministry of Education, Culture, Sports, Science and Technology Norges Forskningsråd 2018 http://dx.doi.org/10.1002/qj.3417 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.3417 https://onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3417 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/qj.3417 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002/qj.3417 https://rmets.onlinelibrary.wiley.com/doi/am-pdf/10.1002/qj.3417 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3417 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 144, issue 717, page 2876-2888 ISSN 0035-9009 1477-870X journal-article 2018 crwiley https://doi.org/10.1002/qj.3417 2024-08-09T04:31:24Z Previous studies have documented extreme stratospheric polar vortex events, but the factors governing their duration have received little attention. Here, we investigate weak and strong stratospheric polar vortex events simulated in ensemble reforecasts for the Northern Hemisphere winter with the seasonal forecast model (System 4) of the European Centre for Medium‐Range Weather Forecasting, in comparison with the European Reanalysis Interim dataset. The individual strong and weak vortex events are classified into short and long events. A composite analysis is conducted for each of the four categories of events with respect to their initial or end days. We examine the characteristics of each category in the forecast model and reanalyses, including anomalous zonal‐mean zonal winds, heat and wave‐activity fluxes, lower‐tropospheric temperature and surface pressure, as well as the synoptic evolution of upper‐tropospheric anomalies during the precursory and decaying stages. The main findings are: (a) the forecast System 4 is found to produce both short and long anomalous vortex events in comparable amplitude to the reanalyses, but the polar zonal wind anomalies are more persistent, for each of the four categories considered; (b) short events penetrate as deep as the long events right at their onset, but they rapidly decay under a wave forcing that is less sustained than in the long events; (c) subtle differences in the synoptic evolution of blocking Highs and Lows over both oceanic basins or over Northern Eurasia or America appear to condition the duration of the forcing; and (d) during such short events, characteristic surface or lower‐tropospheric signatures of the annular mode paradigm arising from the downward stratospheric influence are not allowed sufficient time to develop. Article in Journal/Newspaper Arctic Wiley Online Library Arctic Quarterly Journal of the Royal Meteorological Society 144 717 2876 2888 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Previous studies have documented extreme stratospheric polar vortex events, but the factors governing their duration have received little attention. Here, we investigate weak and strong stratospheric polar vortex events simulated in ensemble reforecasts for the Northern Hemisphere winter with the seasonal forecast model (System 4) of the European Centre for Medium‐Range Weather Forecasting, in comparison with the European Reanalysis Interim dataset. The individual strong and weak vortex events are classified into short and long events. A composite analysis is conducted for each of the four categories of events with respect to their initial or end days. We examine the characteristics of each category in the forecast model and reanalyses, including anomalous zonal‐mean zonal winds, heat and wave‐activity fluxes, lower‐tropospheric temperature and surface pressure, as well as the synoptic evolution of upper‐tropospheric anomalies during the precursory and decaying stages. The main findings are: (a) the forecast System 4 is found to produce both short and long anomalous vortex events in comparable amplitude to the reanalyses, but the polar zonal wind anomalies are more persistent, for each of the four categories considered; (b) short events penetrate as deep as the long events right at their onset, but they rapidly decay under a wave forcing that is less sustained than in the long events; (c) subtle differences in the synoptic evolution of blocking Highs and Lows over both oceanic basins or over Northern Eurasia or America appear to condition the duration of the forcing; and (d) during such short events, characteristic surface or lower‐tropospheric signatures of the annular mode paradigm arising from the downward stratospheric influence are not allowed sufficient time to develop. |
author2 |
Japan Science and Technology Agency Ministry of Education, Culture, Sports, Science and Technology Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Orsolini, Yvan J. Nishii, Kazuaki Nakamura, Hisashi |
spellingShingle |
Orsolini, Yvan J. Nishii, Kazuaki Nakamura, Hisashi Duration and decay of Arctic stratospheric vortex events in the ECMWF seasonal forecast model |
author_facet |
Orsolini, Yvan J. Nishii, Kazuaki Nakamura, Hisashi |
author_sort |
Orsolini, Yvan J. |
title |
Duration and decay of Arctic stratospheric vortex events in the ECMWF seasonal forecast model |
title_short |
Duration and decay of Arctic stratospheric vortex events in the ECMWF seasonal forecast model |
title_full |
Duration and decay of Arctic stratospheric vortex events in the ECMWF seasonal forecast model |
title_fullStr |
Duration and decay of Arctic stratospheric vortex events in the ECMWF seasonal forecast model |
title_full_unstemmed |
Duration and decay of Arctic stratospheric vortex events in the ECMWF seasonal forecast model |
title_sort |
duration and decay of arctic stratospheric vortex events in the ecmwf seasonal forecast model |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/qj.3417 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.3417 https://onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3417 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/qj.3417 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002/qj.3417 https://rmets.onlinelibrary.wiley.com/doi/am-pdf/10.1002/qj.3417 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3417 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 144, issue 717, page 2876-2888 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/qj.3417 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
144 |
container_issue |
717 |
container_start_page |
2876 |
op_container_end_page |
2888 |
_version_ |
1809896870547292160 |