Connections between Potential Vorticity Intrusions and Convection in the Eastern Tropical Pacific

Funatsu, Beatriz M.; Waugh, Darryn W.

doi:10.1175/2007jas2248.1

Cited by 76 publications

(74 citation statements)

References 36 publications

(41 reference statements)

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“…Waugh and Polvani, 2000) and have been found to induce localised convection (e.g. Waugh and Funatsu, 2003;Funatsu and Waugh, 2008). Unlike RWB, the advection of stratospheric air during a PV intrusion process has a north-south orientation that is mostly neither cyclonic nor anticyclonic, but can be weakly anticyclonic.…”

Section: Cols With No Rwb Associationmentioning

confidence: 99%

The link between cut-off lows and Rossby wave breaking in the Southern Hemisphere

Ndarana

Waugh

2010

Q.J.R. Meteorol. Soc.

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The climatological link between cut-off low (COL) pressure systems that occur from 20 to 50 • S and Rossby wave breaking (RWB) in the Southern Hemisphere (SH) is examined for 1979-2008. It is shown that COLs are associated with either RWB events (89%) or with potential vorticity (PV) intrusions where there is north-south advection of high-PV air (11%). In the vast majority of COLs, the RWB events occur upstream, on or before the day of the COL formation. The evolution of the PV, geopotential heights, static stability, absolute vorticity and temperature advection fields during the COLs are consistent with the formation of high-PV anomalies that induce cyclonic circulations as predicted by theory. RWB plays a key role in producing the split flow associated with COLs in the SH, which in turn produces absolute vorticity anomalies by shear-curvature vorticity conversion, and creates static stability anomalies. The COLs associated with RWB at 330 K are deeper and more persistent than those associated with 350 K RWB and surface processes differ depending on the isentropic surface on which the associated RWB occurs. The seasonality of the RWB and COLs are similar, and is linked to the seasonal march of the westerly jets.

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Section: Cols With No Rwb Associationmentioning

confidence: 99%

The link between cut-off lows and Rossby wave breaking in the Southern Hemisphere

Ndarana

Waugh

2010

Q.J.R. Meteorol. Soc.

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“…The examination of the PV structure is instructive in that anomalous, upper-level PV features can be associated with enhanced advection of low-level moisture, forced lifting and atmospheric destabilization (Funatsu and Waugh, 2008;Massacand et al, 1998;Hoinka and Davies, 2007;Schlemmer et al, 2010). With respect to jet stream/streak structure, it has been shown that the ageostrophic circulation associated with jet streaks can also result in forced lifting (Uccelini and Johnson, 1979;Rose et al 2004).…”

Section: Synoptic-scale Environment Of European Tornadoesmentioning

confidence: 99%

Central European tornado environments as viewed from a potential vorticity and Lagrangian perspective

Graf

Sprenger

Moore

2011

Atmospheric Research

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“…The impact of the extratropical circulation on the tropics, such as the lateral propagation of tropospheric Rossby waves, has been studied previously (e.g. Kiladis and Weickmann, 1992;Funatsu and Waugh, 2008). The influence from above (i.e.…”

Section: Introductionmentioning

confidence: 99%

The role of convective overshooting clouds in tropical stratosphere–troposphere dynamical coupling

et al. 2015

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Abstract. This paper investigates the role of deep convection and overshooting convective clouds in stratospheretroposphere dynamical coupling in the tropics during two large major stratospheric sudden warming events in January 2009 and January 2010. During both events, convective activity and precipitation increased in the equatorial Southern Hemisphere as a result of a strengthening of the BrewerDobson circulation induced by enhanced stratospheric planetary wave activity. Correlation coefficients between variables related to the convective activity and the vertical velocity were calculated to identify the processes connecting stratospheric variability to the troposphere. Convective overshooting clouds showed a direct relationship to lower stratospheric upwelling at around 70-50 hPa. As the tropospheric circulation change lags behind that of the stratosphere, outgoing longwave radiation shows almost no simultaneous correlation with the stratospheric upwelling. This result suggests that the stratospheric circulation change first penetrates into the troposphere through the modulation of deep convective activity.

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Connections between Potential Vorticity Intrusions and Convection in the Eastern Tropical Pacific

Cited by 76 publications

References 36 publications

The link between cut-off lows and Rossby wave breaking in the Southern Hemisphere

The link between cut-off lows and Rossby wave breaking in the Southern Hemisphere

Central European tornado environments as viewed from a potential vorticity and Lagrangian perspective

The role of convective overshooting clouds in tropical stratosphere–troposphere dynamical coupling

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