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Daily to decadal modulation of jet variability
- Publication Year :
- 2018
- Publisher :
- American Meteorological Society, 2018.
-
Abstract
- The variance of a jet’s position in latitude is found to be related to its average speed: when a jet becomes stronger, its variability in latitude decreases. This relationship is shown to hold for observed midlatitude jets around the world and also across a hierarchy of numerical models. North Atlantic jet variability is shown to be modulated on decadal time scales, with decades of a strong, steady jet being interspersed with decades of a weak, variable jet. These modulations are also related to variations in the basinwide occurrence of high-impact blocking events. A picture emerges of complex multidecadal jet variability in which recent decades do not appear unusual. An underlying barotropic mechanism is proposed to explain this behavior, related to the change in refractive properties of a jet as it strengthens, and the subsequent effect on the distribution of Rossby wave breaking.
- Subjects :
- Physics
Atmospheric Science
Jet (fluid)
010504 meteorology & atmospheric sciences
Atmospheric circulation
Astrophysics::High Energy Astrophysical Phenomena
Rossby wave
010502 geochemistry & geophysics
Atmospheric sciences
01 natural sciences
Latitude
Physics::Geophysics
North Atlantic oscillation
Barotropic fluid
Middle latitudes
Climatology
Modulation (music)
High Energy Physics::Experiment
Physics::Atmospheric and Oceanic Physics
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- ISSN :
- 15200442
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....4ab294d0b6a2405fda433d32f26c12cb