Vb Cyclones Synchronized With the Arctic‐/North Atlantic Oscillation
Vb cyclones typically emerge in the Western Mediterranean and propagate to the Northeast into Central Europe. This paper explores the temporal characteristics of Vb cyclone occurrence based on cyclone tracks identified at the atmospheric levels of Z700 and sea level pressure, using JRA‐55 reanalysis...
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ftpubmed:oai:pubmedcentral.nih.gov:6559292 2023-05-15T15:00:03+02:00 Vb Cyclones Synchronized With the Arctic‐/North Atlantic Oscillation Hofstätter, M. Blöschl, G. 2019-03-26 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6559292/ https://doi.org/10.1029/2018JD029420 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6559292/ http://dx.doi.org/10.1029/2018JD029420 ©2019. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Research Articles Text 2019 ftpubmed https://doi.org/10.1029/2018JD029420 2019-06-23T00:20:25Z Vb cyclones typically emerge in the Western Mediterranean and propagate to the Northeast into Central Europe. This paper explores the temporal characteristics of Vb cyclone occurrence based on cyclone tracks identified at the atmospheric levels of Z700 and sea level pressure, using JRA‐55 reanalysis data for the period 1959–2015. The risk of Vb occurrence was significantly high in the 1960s and has remained at a lower level since then. Vb cyclones do not occur fully randomly according to a Poisson point process. Eleven well‐separated and distinct clusters as well as 11 hiatus periods are identified, with average occurrence rates of 21.5 and 5.2 yrea(−1), respectively. During the event of Vb, the large‐scale atmospheric circulation is changed into a state favoring the development of successive Vb cyclones. Clustering is very prominent in the case of Genoan Vb cyclones in summer as well as those Vb cyclones developing over the Iberian Peninsula or the North African Coast in winter. Superposition of the polar and the subtropical jet stream over the Western Mediterranean is identified as a main feature at the onset of Vb cyclones. Vb cyclone occurrence appears to be synchronized with the Northern Atlantic Oscillation (NAO; at Z500) and Arctic Oscillation (AO; at Z1000). Clusters have occurred when both NAO and AO were negative. This relation applies to Western Mediterranean cyclones not following a Vb track as well, however to a much weaker extent. In contrast, Vb cyclone frequency was particularly low from 1988 to 1997 during a sustained positive phase of both NAO and AO. Text Arctic North Atlantic North Atlantic oscillation PubMed Central (PMC) Arctic Journal of Geophysical Research: Atmospheres 124 6 3259 3278 |
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Research Articles |
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Research Articles Hofstätter, M. Blöschl, G. Vb Cyclones Synchronized With the Arctic‐/North Atlantic Oscillation |
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Research Articles |
description |
Vb cyclones typically emerge in the Western Mediterranean and propagate to the Northeast into Central Europe. This paper explores the temporal characteristics of Vb cyclone occurrence based on cyclone tracks identified at the atmospheric levels of Z700 and sea level pressure, using JRA‐55 reanalysis data for the period 1959–2015. The risk of Vb occurrence was significantly high in the 1960s and has remained at a lower level since then. Vb cyclones do not occur fully randomly according to a Poisson point process. Eleven well‐separated and distinct clusters as well as 11 hiatus periods are identified, with average occurrence rates of 21.5 and 5.2 yrea(−1), respectively. During the event of Vb, the large‐scale atmospheric circulation is changed into a state favoring the development of successive Vb cyclones. Clustering is very prominent in the case of Genoan Vb cyclones in summer as well as those Vb cyclones developing over the Iberian Peninsula or the North African Coast in winter. Superposition of the polar and the subtropical jet stream over the Western Mediterranean is identified as a main feature at the onset of Vb cyclones. Vb cyclone occurrence appears to be synchronized with the Northern Atlantic Oscillation (NAO; at Z500) and Arctic Oscillation (AO; at Z1000). Clusters have occurred when both NAO and AO were negative. This relation applies to Western Mediterranean cyclones not following a Vb track as well, however to a much weaker extent. In contrast, Vb cyclone frequency was particularly low from 1988 to 1997 during a sustained positive phase of both NAO and AO. |
format |
Text |
author |
Hofstätter, M. Blöschl, G. |
author_facet |
Hofstätter, M. Blöschl, G. |
author_sort |
Hofstätter, M. |
title |
Vb Cyclones Synchronized With the Arctic‐/North Atlantic Oscillation |
title_short |
Vb Cyclones Synchronized With the Arctic‐/North Atlantic Oscillation |
title_full |
Vb Cyclones Synchronized With the Arctic‐/North Atlantic Oscillation |
title_fullStr |
Vb Cyclones Synchronized With the Arctic‐/North Atlantic Oscillation |
title_full_unstemmed |
Vb Cyclones Synchronized With the Arctic‐/North Atlantic Oscillation |
title_sort |
vb cyclones synchronized with the arctic‐/north atlantic oscillation |
publisher |
John Wiley and Sons Inc. |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6559292/ https://doi.org/10.1029/2018JD029420 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic North Atlantic North Atlantic oscillation |
genre_facet |
Arctic North Atlantic North Atlantic oscillation |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6559292/ http://dx.doi.org/10.1029/2018JD029420 |
op_rights |
©2019. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2018JD029420 |
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Journal of Geophysical Research: Atmospheres |
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124 |
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6 |
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3259 |
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3278 |
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