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Vb Cyclones Synchronized With the Arctic‐/North Atlantic Oscillation
- Source :
- Journal of Geophysical Research. Atmospheres
- Publication Year :
- 2019
- Publisher :
- American Geophysical Union (AGU), 2019.
-
Abstract
- 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.<br />Key Points In the past 50 years, the frequency of Vb cyclones was high in the 1960s and lower since thenVb cyclones were strongly synchronized with NAO and AO; high frequency clusters occurred when NAO and AO were negativeThe coupling of the polar and the subtropical jet stream over the Western Mediterranean is a driving mechanism of the onset of Vb cyclones
- Subjects :
- Western Mediterranean
Atmospheric Science
010504 meteorology & atmospheric sciences
02 engineering and technology
01 natural sciences
Oceans
Earth and Planetary Sciences (miscellaneous)
Stochastic Phenomena
020701 environmental engineering
Research Articles
Climatology
teleconnection
Climate and Dynamics
Climate and Interannual Variability
Synoptic‐scale Meteorology
Vb track
Jet stream
Oceanography: General
mid latitude cyclones
climate change
Geophysics
Atmospheric Processes
Cyclone
Ocean Monitoring with Geodetic Techniques
Mathematical Geophysics
Fronts and Jets
Geology
Oceanography: Physical
Research Article
clustering
Persistence, Memory, Correlations, Clustering
Atmospheric circulation
0207 environmental engineering
Climate change
Hiatus
Decadal Ocean Variability
Extreme Events
Geodesy and Gravity
Global Change
0105 earth and related environmental sciences
Climate Change and Variability
Stochastic Processes
Climate Variability
General Circulation
Mass Balance
Arctic oscillation
13. Climate action
Space and Planetary Science
North Atlantic oscillation
Space Plasma Physics
Natural Hazards
Teleconnection
Subjects
Details
- ISSN :
- 21698996 and 2169897X
- Volume :
- 124
- Database :
- OpenAIRE
- Journal :
- Journal of Geophysical Research: Atmospheres
- Accession number :
- edsair.doi.dedup.....66eaaad98889cd6c540e81d842f5c2a6