Potential vorticity in warm conveyor belt outflow

Warm conveyor belts (WCBs) are the main ascending air masses within extratropical cyclones. They often exhibit strong condensation and precipitation, associated with ascent on large scales or embedded convection. Most of the air outflows into the upper troposphere as part of a ridge. Such ridges are an integral part of Rossby waves propagating along the tropopause and are identified with a negative potential vorticity (PV) anomaly and associated anticyclonic circulation. It has been argued that diabatic modification of PV in WCBs has an important influence on the extent of the ridge, propagation of Rossby waves and weather impacts downstream.

[1]  Robert S. Plant,et al.  The dichotomous structure of the warm conveyor belt , 2014 .

[2]  Heini Wernli,et al.  Warm Conveyor Belts in the ERA-Interim Dataset (1979–2010): Part I: Climatology and Potential Vorticity Evolution , 2014 .

[3]  M. Rodwell,et al.  Characteristics of occasional poor medium-range weather forecasts for Europe , 2013 .

[4]  Huw C. Davies,et al.  Diagnosis and Dynamics of Forecast Error Growth , 2013 .

[5]  John Methven,et al.  Diabatic processes modifying potential vorticity in a North Atlantic cyclone , 2013 .

[6]  J. Methven,et al.  Numerical modeling study of boundary-layer ventilation by a cold front over Europe , 2005 .

[7]  John Methven,et al.  Estimating photochemically produced ozone throughout a domain using flight data and a Lagrangian model , 2003 .

[8]  Alan J. Thorpe,et al.  The Evolution and Dynamical Role of Reduced Upper-Tropospheric Potential Vorticity in Intensive Observing Period One of FASTEX , 2000 .

[9]  John Methven,et al.  The Advection of High-Resolution Tracers by Low-Resolution Winds , 1999 .

[10]  Per Capita,et al.  About the authors , 1995, Machine Vision and Applications.

[11]  K. Browning,et al.  Structure of a frontal cyclone , 1994 .

[12]  B. Hoskins.  Towards a PV- θ view of the general circulation , 1991 .

[13]  M. McIntyre,et al.  On the Conservation and Impermeability Theorems for Potential Vorticity , 1990 .

[14]  Peter H. Haynes,et al.  On the Evolution of Vorticity and Potential Vorticity in the Presence of Diabatic Heating and Frictional or Other Forces , 1987 .

[15]  T. W. Harrold.  Mechanisms influencing the distribution of precipitation within baroclinic disturbances , 1973 .

[16]  K. A. Browning,et al.  RADAR MEASUREMENTS OF AIR MOTION NEAR FRONTS , 1971 .

[17]  Wanying Wang,et al.  Conclusions and Discussion , 2014 .

[18]  Heini Wernli,et al.  Influence of microphysical processes on the potential vorticity development in a warm conveyor belt: a case‐study with the limited‐area model COSMO , 2012 .

[19]  C. Bishop,et al.  The counter‐propagating Rossby‐wave perspective on baroclinic instability. I: Mathematical basis , 2004 .

[20]  C. Bishop,et al.  The counter‐propagating Rossby‐wave perspective on baroclinic instability. II: Application to the Charney model , 2004 .

[21]  Heini Wernli,et al.  A Lagrangian‐based analysis of extratropical cyclones. I: The method and some applications , 1997 .

[22]  B. Hoskins,et al.  Two paradigms of baroclinic‐wave life‐cycle behaviour , 1993 .