%0 Journal Article %1 goss2021atlantic %A Goss, Michael %A Lindgren, Erik A. %A Sheshadri, Aditi %A Diffenbaugh, Noah S. %D 2021 %I American Geophysical Union (AGU) %J Journal of Geophysical Research: Atmospheres %K MyStratTropWork climatology dynamics jet stormtracks weathertypes %R 10.1029/2020jd033358 %T The Atlantic jet response to stratospheric events: a regime perspective %U https://doi.org/10.1029/2020jd033358 %X The tropospheric response to Sudden Stratospheric Warmings (SSWs) is associated with an equatorward shift in the midlatitude jet and associated storm tracks, while Strong Polar Vortex (SPV) events elicit a contrasting response. Recent analyses of the North Atlantic jet using probability density functions of a jet latitude index have identified three preferred jet latitudes, raising the question of whether the tropospheric response to SSWs and SPVs results from a change in the relative frequencies of these preferred jet regimes rather than a systematic jet shift. We explore this question using atmospheric reanalysis data from 1979‐2018 (26 SSWs and 33 SPVs), and a 202‐year integration of the Whole Atmosphere Community Climate Model (92 SSWs and 68 SPVs). Following SSWs, the northern jet regime becomes less common, and the central and southern regimes become more common. These changes occur almost immediately following “split” vortex events, but are more delayed following “displacement” events. In contrast, the northern regime becomes more frequent and the southern regime less frequent following SPV events. Following SSWs, composites of 500‐hPa geopotential heights, surface air temperatures, and precipitation most closely resemble composites of the southern jet regime, and are generally opposite in sign to composites of the northern jet regime. These comparisons are reversed following SPVs. Thus, one possible interpretation is that the two southernmost regimes appear to be favored following SSWs, while the southernmost regime becomes less common following SPVs.

@article{goss2021atlantic, abstract = {The tropospheric response to Sudden Stratospheric Warmings (SSWs) is associated with an equatorward shift in the midlatitude jet and associated storm tracks, while Strong Polar Vortex (SPV) events elicit a contrasting response. Recent analyses of the North Atlantic jet using probability density functions of a jet latitude index have identified three preferred jet latitudes, raising the question of whether the tropospheric response to SSWs and SPVs results from a change in the relative frequencies of these preferred jet regimes rather than a systematic jet shift. We explore this question using atmospheric reanalysis data from 1979‐2018 (26 SSWs and 33 SPVs), and a 202‐year integration of the Whole Atmosphere Community Climate Model (92 SSWs and 68 SPVs). Following SSWs, the northern jet regime becomes less common, and the central and southern regimes become more common. These changes occur almost immediately following “split” vortex events, but are more delayed following “displacement” events. In contrast, the northern regime becomes more frequent and the southern regime less frequent following SPV events. Following SSWs, composites of 500‐hPa geopotential heights, surface air temperatures, and precipitation most closely resemble composites of the southern jet regime, and are generally opposite in sign to composites of the northern jet regime. These comparisons are reversed following SPVs. Thus, one possible interpretation is that the two southernmost regimes appear to be favored following SSWs, while the southernmost regime becomes less common following SPVs.}, added-at = {2021-04-06T15:55:08.000+0200}, author = {Goss, Michael and Lindgren, Erik A. and Sheshadri, Aditi and Diffenbaugh, Noah S.}, biburl = {https://www.bibsonomy.org/bibtex/2f3dc9d1cb94fe9e1006021c30c9d5273/pbett}, doi = {10.1029/2020jd033358}, interhash = {749178e5a07593b85cdfb801e4310d11}, intrahash = {f3dc9d1cb94fe9e1006021c30c9d5273}, journal = {Journal of Geophysical Research: Atmospheres}, keywords = {MyStratTropWork climatology dynamics jet stormtracks weathertypes}, month = mar, publisher = {American Geophysical Union ({AGU})}, timestamp = {2021-04-06T15:55:08.000+0200}, title = {The Atlantic jet response to stratospheric events: a regime perspective}, url = {https://doi.org/10.1029/2020jd033358}, year = 2021 }