Influence of the Arctic Oscillation on the variability of winter mean temperatures in Turkey

WOS: 000253995900006 Observed changes and variability in winter (DJF) mean temperature series at the 70 stations of Turkey and the circulation types at 500-hPa geopotential height level were investigated to explain atmospheric controls of the temperature variations during the extreme and normal phas...

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Published in:Theoretical and Applied Climatology
Main Authors: Tuerkes, M., Erlat, E.
Other Authors: Ege Üniversitesi
Format: Article in Journal/Newspaper
Language:English
Published: Springer Wien 2008
Subjects:
Online Access:https://hdl.handle.net/11454/40655
https://doi.org/10.1007/s00704-007-0310-8
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spelling ftunivege:oai:acikerisim.ege.edu.tr:11454/40655 2023-05-15T15:00:47+02:00 Influence of the Arctic Oscillation on the variability of winter mean temperatures in Turkey Tuerkes, M. Erlat, E. Ege Üniversitesi 2008 https://hdl.handle.net/11454/40655 https://doi.org/10.1007/s00704-007-0310-8 eng eng Springer Wien 10.1007/s00704-007-0310-8 Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı Theoretical and Applied Climatology 0177-798X 1434-4483 https://doi.org/10.1007/s00704-007-0310-8 https://hdl.handle.net/11454/40655 92 01.Feb 75 85 info:eu-repo/semantics/closedAccess article 2008 ftunivege https://doi.org/10.1007/s00704-007-0310-8 2022-05-02T06:53:12Z WOS: 000253995900006 Observed changes and variability in winter (DJF) mean temperature series at the 70 stations of Turkey and the circulation types at 500-hPa geopotential height level were investigated to explain atmospheric controls of the temperature variations during the extreme and normal phases of the Arctic Oscillation Index (AOI). The analysis was performed with respect to relationships between winter (monthly and seasonal) mean temperatures and the AOI and the composite winter (monthly and seasonal) temperature changes corresponding to the various phases of the AOI. Main conclusions and evaluations of the study are as follows: (1) Negative relationships are found between year-to-year variability of normalized winter (seasonal and monthly) temperatures and the AOI winter (seasonal and monthly) indices at all stations. Correlation coefficients are statistically significant at the 1% level for the majority of stations. (2) The height of the 500-hPa level circulation is anomalously high over middle of the North Africa, the Middle East and the Caspian Sea during the negative phase of the AOI, and anomalously low over the northeast Atlantic-Europe regions. This 500-hPa level AO pattern forms the spatially coherent warm signals in Turkey by increasing the westerly and southwesterly circulation carrying Atlantic and northernmost African warm air into the eastern Mediterranean and Turkey. (3) During the positive phase of the AOI the 500-hPa level is anomalously high over the northeast Atlantic and Europe including Turkey, while it is anomalously low over the region of the Icelandic Low. This pattern leads to intrusions of cold polar air southward into the Balkans, Turkey and the eastern Mediterranean by increasing northerly and northeasterly circulation and therefore, spatially coherent cold signals over Turkey. Article in Journal/Newspaper Arctic Northeast Atlantic Ege University Institutional Repository Arctic Theoretical and Applied Climatology 92 1-2 75 85
institution Open Polar
collection Ege University Institutional Repository
op_collection_id ftunivege
language English
description WOS: 000253995900006 Observed changes and variability in winter (DJF) mean temperature series at the 70 stations of Turkey and the circulation types at 500-hPa geopotential height level were investigated to explain atmospheric controls of the temperature variations during the extreme and normal phases of the Arctic Oscillation Index (AOI). The analysis was performed with respect to relationships between winter (monthly and seasonal) mean temperatures and the AOI and the composite winter (monthly and seasonal) temperature changes corresponding to the various phases of the AOI. Main conclusions and evaluations of the study are as follows: (1) Negative relationships are found between year-to-year variability of normalized winter (seasonal and monthly) temperatures and the AOI winter (seasonal and monthly) indices at all stations. Correlation coefficients are statistically significant at the 1% level for the majority of stations. (2) The height of the 500-hPa level circulation is anomalously high over middle of the North Africa, the Middle East and the Caspian Sea during the negative phase of the AOI, and anomalously low over the northeast Atlantic-Europe regions. This 500-hPa level AO pattern forms the spatially coherent warm signals in Turkey by increasing the westerly and southwesterly circulation carrying Atlantic and northernmost African warm air into the eastern Mediterranean and Turkey. (3) During the positive phase of the AOI the 500-hPa level is anomalously high over the northeast Atlantic and Europe including Turkey, while it is anomalously low over the region of the Icelandic Low. This pattern leads to intrusions of cold polar air southward into the Balkans, Turkey and the eastern Mediterranean by increasing northerly and northeasterly circulation and therefore, spatially coherent cold signals over Turkey.
author2 Ege Üniversitesi
format Article in Journal/Newspaper
author Tuerkes, M.
Erlat, E.
spellingShingle Tuerkes, M.
Erlat, E.
Influence of the Arctic Oscillation on the variability of winter mean temperatures in Turkey
author_facet Tuerkes, M.
Erlat, E.
author_sort Tuerkes, M.
title Influence of the Arctic Oscillation on the variability of winter mean temperatures in Turkey
title_short Influence of the Arctic Oscillation on the variability of winter mean temperatures in Turkey
title_full Influence of the Arctic Oscillation on the variability of winter mean temperatures in Turkey
title_fullStr Influence of the Arctic Oscillation on the variability of winter mean temperatures in Turkey
title_full_unstemmed Influence of the Arctic Oscillation on the variability of winter mean temperatures in Turkey
title_sort influence of the arctic oscillation on the variability of winter mean temperatures in turkey
publisher Springer Wien
publishDate 2008
url https://hdl.handle.net/11454/40655
https://doi.org/10.1007/s00704-007-0310-8
geographic Arctic
geographic_facet Arctic
genre Arctic
Northeast Atlantic
genre_facet Arctic
Northeast Atlantic
op_relation 10.1007/s00704-007-0310-8
Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
Theoretical and Applied Climatology
0177-798X
1434-4483
https://doi.org/10.1007/s00704-007-0310-8
https://hdl.handle.net/11454/40655
92
01.Feb
75
85
op_rights info:eu-repo/semantics/closedAccess
op_doi https://doi.org/10.1007/s00704-007-0310-8
container_title Theoretical and Applied Climatology
container_volume 92
container_issue 1-2
container_start_page 75
op_container_end_page 85
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