Daily to decadal modulation of jet variability
Lee, Robert W.
MetadataShow full item record
KeywordAtmospheric circulation; Jets; North Atlantic Oscillation; Baroclinic models; Decadal variability
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.
Author Posting. © American Meteorological Society, 2018. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 30 (2018): 1297-1314, doi:10.1175/JCLI-D-17-0286.1.
Suggested CitationJournal of Climate 30 (2018): 1297-1314
Showing items related by title, author, creator and subject.
Arctic decadal variability from an idealized atmosphere-ice-ocean model : 2. Simulation of decadal oscillations Dukhovskoy, Dmitry S.; Johnson, Mark A.; Proshutinsky, Andrey (2006-06-20)A simple model of the Arctic Ocean and Greenland Sea, coupled to a thermodynamic sea ice model and an atmospheric model, has been used to study decadal variability of the Arctic ice-ocean-atmosphere climate system. The ...
Gulf Stream variability in the context of quasi‐decadal and multidecadal Atlantic climate variability McCarthy, Gerard D.; Joyce, Terrence M.; Josey, Simon A. (John Wiley & Sons, 2018-10-20)The Gulf Stream plays an important role in North Atlantic climate variability on a range of timescales. The North Atlantic is notable for large decadal variability in sea surface temperatures (SST). Whether this variability ...
Decadal variability of the upper ocean heat content in the East/Japan Sea and its possible relationship to northwestern Pacific variability Na, Hanna; Kim, Kwang-Yul; Chang, Kyung-Il; Park, Jong Jin; Kim, Kuh; Minobe, Shoshiro (American Geophysical Union, 2012-02-09)The upper ocean heat content variability in the East/Japan Sea was investigated using a 40 year temperature and salinity data set from 1968 to 2007. Decadal variability was identified as the dominant mode of variability ...