Presentation is loading. Please wait.

Presentation is loading. Please wait.

Potential vorticity dynamics of a tropopause polar vortex

Published by Modified over 9 years ago

Similar presentations

Presentation on theme: "Potential vorticity dynamics of a tropopause polar vortex"— Presentation transcript:

1 Potential vorticity dynamics of a tropopause polar vortex
Steven M. Cavallo and Gregory J. Hakim University of Washington Department of Atmospheric Sciences 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

2 16th Conference on Atmospheric and Oceanic Fluid Dynamics
Outline Tropopause polar vortices (TPVs) Ertel Potential Vorticity (EPV) Mechanisms for vortex intensity changes November 2005 TPV Overview and observations Potential vorticity analysis  PV budget 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

3 What are tropopause polar vortices (TPVs)?
Vortices that occur north and away from jet stream Based on tropopause Cold core Vortices defined by closed contours of a materially conserved field such as PV  Changes in strength equivalent to changes in fluid properties within closed contours Disturbances wave-like along jet stream 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

4 Why do we care about TPVs?
Formation and intensity changes are not well understood Are often long-lived  Can have lifetimes > 1 month Trigger surface cyclones, such as in the image above  Eventually drift into midlatitudes and jet stream, impacting the weather 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

5 Ertel Potential Vorticity (EPV)
25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

6 What EPV changes can we expect with a cloud?
Latent heating Heating rate 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

7 What EPV changes can we expect with a cloud?
Latent heating EPV changes 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

8 What EPV changes can we expect with a cloud?
Radiation Heating rate 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

9 What EPV changes can we expect with a cloud?
Latent heating EPV changes 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

10 What EPV changes can we expect with a cloud?
Radiation + Latent heating Net EPV changes (radiation > latent heating) 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

11 What EPV changes can we expect with a cloud?
Radiation + Latent heating Net EPV changes (radiation < latent heating) 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

12 November 2005 TPV: Observations
GFS analysis tropopause pressure Coral Harbour, NT sounding 21 November 2005 at 00 UTC 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

13 November 2005 TPV: Observations
GFS analysis tropopause pressure Coral Harbour, NT sounding 22 November 2005 at 00 UTC 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

14 16th Conference on Atmospheric and Oceanic Fluid Dynamics
November 2005 TPV GFS Tropopause  Analysis WRF (V ) simulations: X = 30 km, Nz = 31 5-class microphysics, RRTM longwave radiation GFS initial conditions, boundaries updated every 3 hours 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

15 16th Conference on Atmospheric and Oceanic Fluid Dynamics
November 2005 TPV GFS Tropopause  Analysis WRF (V ) simulations: X = 30 km, Nz = 31 5-class microphysics, RRTM longwave radiation GFS initial conditions, boundaries updated every 3 hours 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

16 November 2005 TPV: Strengthening
PV Budget: Time mean vertical profiles for Siberia segment All EPV components Diabatic components 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

17 November 2005 TPV: Strengthening
PV Budget Time-height: Diabatic components Diabatic components 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

18 November 2005 TPV: Strengthening
PV Budget Time-height: Radiation and cloud Diabatic components 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

19 November 2005 TPV: Strengthening
PV Budget Time-height: Latent heat + Radiation Diabatic components 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

20 November 2005 TPV: Weakening
PV Budget: Time mean vertical profiles for Hudson Bay segment All EPV components Diabatic components 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

21 16th Conference on Atmospheric and Oceanic Fluid Dynamics
Summary TPV strengthening from cloud-top radiational cooling in November 2005 TPV TPV weakening processes not clear, but strengthening no longer appears to occur when latent heating effects dominate the radiational effects. Is radiation always the key driver? What dynamics control weakening?  Work is underway involving idealized experiments to isolate the dynamics responsible for TPV intensity changes. 25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

22 16th Conference on Atmospheric and Oceanic Fluid Dynamics
25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

23 What can we expect from a cloud?
25 June 2007 16th Conference on Atmospheric and Oceanic Fluid Dynamics

Download ppt "Potential vorticity dynamics of a tropopause polar vortex"

Similar presentations

U.S. Contribution to T-NAWDEX: “DOWNSTREAM” Heather Archambault (NPS), Steven Cavallo (OU), Dan Cziczo (MIT), Chris Davis (NCAR), Pat Harr (NPS), Laura.

U.S. Contribution to T-NAWDEX: “DOWNSTREAM” Heather Archambault (NPS), Steven Cavallo (OU), Dan Cziczo (MIT), Chris Davis (NCAR), Pat Harr (NPS), Laura.
P. 277. Cold Front: cold air behind front (often to NW) abrupt cooling as it passes Warm Front:warm air behind front (often to S) more gradual warming.

P Cold Front: cold air behind front (often to NW) abrupt cooling as it passes Warm Front:warm air behind front (often to S) more gradual warming.
Hurricane Dynamics 101 Roger K. Smith University of Munich.

Hurricane Dynamics 101 Roger K. Smith University of Munich.
Improved Simulations of Clouds and Precipitation Using WRF-GSI Zhengqing Ye and Zhijin Li NASA-JPL/UCLA June, 2011.

Improved Simulations of Clouds and Precipitation Using WRF-GSI Zhengqing Ye and Zhijin Li NASA-JPL/UCLA June, 2011.
General Circulation and Kinetic Energy

General Circulation and Kinetic Energy
ATM S 542 Synoptic Meteorology Overview Gregory J. Hakim University of Washington, Seattle, USA www.atmos.washington.edu/~hakim Vertical structure of the.

ATM S 542 Synoptic Meteorology Overview Gregory J. Hakim University of Washington, Seattle, USA Vertical structure of the.
S4D WorkshopParis, France Polar Meteorology Group, Byrd Polar Research Center, The Ohio State University, Columbus, Ohio A High-Resolution David H. Bromwich.

S4D WorkshopParis, France Polar Meteorology Group, Byrd Polar Research Center, The Ohio State University, Columbus, Ohio A High-Resolution David H. Bromwich.
An Unusual Pathway to Oceanic Cyclogenesis Linking “Perfect Storms” in the North Atlantic Ocean Jason M. Cordeira and Lance F. Bosart Department of Earth.

An Unusual Pathway to Oceanic Cyclogenesis Linking “Perfect Storms” in the North Atlantic Ocean Jason M. Cordeira and Lance F. Bosart Department of Earth.
A WRF Simulation of the Genesis of Tropical Storm Eugene (2005) Associated With the ITCZ Breakdowns The UMD/NASA-GSFC Users' and Developers' Workshop,

A WRF Simulation of the Genesis of Tropical Storm Eugene (2005) Associated With the ITCZ Breakdowns The UMD/NASA-GSFC Users' and Developers' Workshop,
PV Budgeting on tropopause polar vortices Steven Cavallo University of Washington Group Meeting September 27, 2005.

PV Budgeting on tropopause polar vortices Steven Cavallo University of Washington Group Meeting September 27, 2005.
A Multiscale Examination of a Mesoscale Cyclogenesis Event in a Polar Air Stream Tom Galarneau, Dan Keyser, and Lance Bosart Department of Earth and Atmospheric.

A Multiscale Examination of a Mesoscale Cyclogenesis Event in a Polar Air Stream Tom Galarneau, Dan Keyser, and Lance Bosart Department of Earth and Atmospheric.
Gareth’s modeling extravaganza.. Approach. - Using a full-physics mesoscale model to simulate AEW cases. - Analysis of model output will be subjected.

Gareth’s modeling extravaganza.. Approach. - Using a full-physics mesoscale model to simulate AEW cases. - Analysis of model output will be subjected.
Background Tropopause theta composites Summary Development of TPVs is greatest in the Baffin Island vicinity in Canada, with development possibly having.

Background Tropopause theta composites Summary Development of TPVs is greatest in the Baffin Island vicinity in Canada, with development possibly having.
An introduction to the Inter-tropical Convergence Zone (ITCZ) Chia-chi Wang Dept. Atmospheric Sciences Chinese Culture University Acknowledgment: Prof.

An introduction to the Inter-tropical Convergence Zone (ITCZ) Chia-chi Wang Dept. Atmospheric Sciences Chinese Culture University Acknowledgment: Prof.
Mesoscale Convective Systems Robert Houze Department of Atmospheric Sciences University of Washington Nebraska Kansas Oklahoma Arkansas.

Mesoscale Convective Systems Robert Houze Department of Atmospheric Sciences University of Washington Nebraska Kansas Oklahoma Arkansas.
The first 2 terms on the RHS are nonlinear terms in the bias. The group labeled THF are transient heat advection bias. Q^ is the bias in diabatic heating.

The first 2 terms on the RHS are nonlinear terms in the bias. The group labeled THF are transient heat advection bias. Q^ is the bias in diabatic heating.
A Reanalysis of Hurricane Hazel (1954) Scott Weese, Ron McTaggart-Cowan and John R. Gyakum Department of Atmospheric and Oceanic Sciences McGill University.

A Reanalysis of Hurricane Hazel (1954) Scott Weese, Ron McTaggart-Cowan and John R. Gyakum Department of Atmospheric and Oceanic Sciences McGill University.
Background In deriving basic understanding of atmospheric phenomena, the analysis often revolves around discovering and exploiting relationships between.

Background In deriving basic understanding of atmospheric phenomena, the analysis often revolves around discovering and exploiting relationships between.
Upper-Level Precursors Associated with Subtropical Cyclone Formation in the North Atlantic Alicia M. Bentley, Daniel Keyser, and Lance F. Bosart University.

Upper-Level Precursors Associated with Subtropical Cyclone Formation in the North Atlantic Alicia M. Bentley, Daniel Keyser, and Lance F. Bosart University.
Impact of the 4D-Var Assimilation of Airborne Doppler Radar Data on Numerical Simulations of the Genesis of Typhoon Nuri (2008) Zhan Li and Zhaoxia Pu.

Impact of the 4D-Var Assimilation of Airborne Doppler Radar Data on Numerical Simulations of the Genesis of Typhoon Nuri (2008) Zhan Li and Zhaoxia Pu.

Similar presentations

Ads by Google