Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02
Influences from the Tropics, the stratosphere and the specification of observed sea surface temperature and sea-ice (SSTSI) on Northern Hemisphere winter mean circulation anomalies during the period 1960/61 to 2001/02 are studied using a relaxation technique applied to the ECMWF model. On interannua...
Published in: | Quarterly Journal of the Royal Meteorological Society |
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Language: | English |
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Royal Meteorological Society
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Online Access: | https://oceanrep.geomar.de/id/eprint/14317/ https://oceanrep.geomar.de/id/eprint/14317/3/greatbatch_gollan_jung_kunz12.pdf https://doi.org/10.1002/qj.1947 |
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ftoceanrep:oai:oceanrep.geomar.de:14317 2023-05-15T17:30:40+02:00 Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02 Greatbatch, Richard John Gollan, Gereon Jung, T. Kunz, Torben 2012 text https://oceanrep.geomar.de/id/eprint/14317/ https://oceanrep.geomar.de/id/eprint/14317/3/greatbatch_gollan_jung_kunz12.pdf https://doi.org/10.1002/qj.1947 en eng Royal Meteorological Society https://oceanrep.geomar.de/id/eprint/14317/3/greatbatch_gollan_jung_kunz12.pdf Greatbatch, R. J. , Gollan, G. , Jung, T. and Kunz, T. (2012) Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02. Open Access Quarterly Journal of the Royal Meteorological Society, 138 . pp. 1970-1982. DOI 10.1002/qj.1947 <https://doi.org/10.1002/qj.1947>. doi:10.1002/qj.1947 info:eu-repo/semantics/openAccess Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1002/qj.1947 2023-04-07T15:03:55Z Influences from the Tropics, the stratosphere and the specification of observed sea surface temperature and sea-ice (SSTSI) on Northern Hemisphere winter mean circulation anomalies during the period 1960/61 to 2001/02 are studied using a relaxation technique applied to the ECMWF model. On interannual time-scales, the Tropics strongly influence the Pacific sector but also the North Atlantic sector, although weakly. The stratosphere is found to be influential on the North Atlantic Oscillation (NAO) on interannual time-scales but is less important over the Pacific sector. Adding the observed SSTSI to the tropical relaxation runs generally improves the model performance on interannual time-scales but degrades/enhances the model’s ability to capture the 42-year trend over the Pacific/Atlantic sector. While relaxing the stratosphere to the reanalysis fails to capture the trend over the whole 42-year period, the stratosphere is shown to be influential on the upward trend of the NAO index from 1965 to 1995, but with reduced amplitude compared to previous studies. Influence from the Tropics is found to be important for the trend over both time periods and over both sectors although, across all experiments, we can account for only 30% of the amplitude of the hemispheric trend. Copyright c� 2012 Royal Meteorological Society Article in Journal/Newspaper North Atlantic North Atlantic oscillation Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Quarterly Journal of the Royal Meteorological Society 138 669 1970 1982 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Influences from the Tropics, the stratosphere and the specification of observed sea surface temperature and sea-ice (SSTSI) on Northern Hemisphere winter mean circulation anomalies during the period 1960/61 to 2001/02 are studied using a relaxation technique applied to the ECMWF model. On interannual time-scales, the Tropics strongly influence the Pacific sector but also the North Atlantic sector, although weakly. The stratosphere is found to be influential on the North Atlantic Oscillation (NAO) on interannual time-scales but is less important over the Pacific sector. Adding the observed SSTSI to the tropical relaxation runs generally improves the model performance on interannual time-scales but degrades/enhances the model’s ability to capture the 42-year trend over the Pacific/Atlantic sector. While relaxing the stratosphere to the reanalysis fails to capture the trend over the whole 42-year period, the stratosphere is shown to be influential on the upward trend of the NAO index from 1965 to 1995, but with reduced amplitude compared to previous studies. Influence from the Tropics is found to be important for the trend over both time periods and over both sectors although, across all experiments, we can account for only 30% of the amplitude of the hemispheric trend. Copyright c� 2012 Royal Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Greatbatch, Richard John Gollan, Gereon Jung, T. Kunz, Torben |
spellingShingle |
Greatbatch, Richard John Gollan, Gereon Jung, T. Kunz, Torben Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02 |
author_facet |
Greatbatch, Richard John Gollan, Gereon Jung, T. Kunz, Torben |
author_sort |
Greatbatch, Richard John |
title |
Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02 |
title_short |
Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02 |
title_full |
Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02 |
title_fullStr |
Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02 |
title_full_unstemmed |
Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02 |
title_sort |
factors influencing northern hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02 |
publisher |
Royal Meteorological Society |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/14317/ https://oceanrep.geomar.de/id/eprint/14317/3/greatbatch_gollan_jung_kunz12.pdf https://doi.org/10.1002/qj.1947 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
North Atlantic North Atlantic oscillation Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/14317/3/greatbatch_gollan_jung_kunz12.pdf Greatbatch, R. J. , Gollan, G. , Jung, T. and Kunz, T. (2012) Factors influencing Northern Hemisphere winter mean atmospheric circulation anomalies during the period 1960/61 to 2001/02. Open Access Quarterly Journal of the Royal Meteorological Society, 138 . pp. 1970-1982. DOI 10.1002/qj.1947 <https://doi.org/10.1002/qj.1947>. doi:10.1002/qj.1947 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/qj.1947 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
138 |
container_issue |
669 |
container_start_page |
1970 |
op_container_end_page |
1982 |
_version_ |
1766127542171860992 |