ANIMATION OF THE TROWAL AIRSTREAM

This page contains animations of the "trowal airstream" described in a paper entitled "Quasi-Geostrophic Forcing of Ascent in the Occluded Sector of Cyclones and the Trowal Airstream" by J. E. Martin.

In the manuscript, the Q-G forcing of vertical motions in the occluded quadrant of three cyclones is examined using a numerical simulation of each. This page presents animations in FLI format, (click here for more information) of the trowal airstream in each case.

23 October 1996 Case

This first animation shows a plan view of the 315 K Theta-e isosurface and the trowal airstream from the 23 October 1996 case. Notice how the cyclonically curving airstream moves right through the trowal, the "canyon" in the 315 K Theta-e surface.

Animation of the 315 K Theta-e isosurface and the Trowal airstream for the 23 October 1996 case (2.45 Mb)

Here the same moist isentropic surface is shown with the trowal airstream but from a northerly perspective. This allows for a different view of the relationship between this airflow and the trowal structure.

Animation of the 315 K Theta-e isosurface and the Trowal airstream from a Northern perspective for the 23 October 1996 case (2.74 Mb)

A perspective on the vertical displacement associated with the trowal airstream is given by this view of the airstream from the east. The lower and upper limits of elevation reached by the airstream are indicated.

Animation of the trowal airstream from an eastern perspective (58 Kb)

7 November 1996 Case

The following animation is of the 309 K Theta-E surface and the trowal airstream from the 7 November 1996 case discussed in the manuscript. This planview offers a clear picture of the trowal airsteam and how it moves through the trowal.

Animation of the 309 K Theta-e isosurface and the Trowal airstream for the 7 November 1996 case (1.92 Mb)

Here the same moist isentropic surface is shown with the trowal airstream but from a northerly perspective. This allows for a different view of the relationship between this airflow and the trowal structure.

Animation of the 309 K Theta-E surface and the Trowal airstream from a Northern perspective for the 7 November 1996 case (1.33 Mb)

A perspective on the vertical displacement associated with the trowal airstream is given by this view of the airstream from the east. The lower and upper limits of elevation reached by the airstream are indicated.

Animation of the Trowal airstream from an eastern perspective (50 Kb)

1 April 1997 Case

The following animation is of the 312 K Theta-E isosurface and the trowal airstream from the 1 April 1997 case described in the manuscript. This planview offers a dramatic picture of the trowal airstream and its spatial relationship to the trowal.

Animation of the 312 K Theta-e isosurface and the Trowal airstream from the 1 April 1997 case (2.16 Mb)

Here the same moist isentropic surface is shown with the trowal airstream but from a northerly perspective. This allows for a different view of the relationship between this airflow and the trowal structure.

Animation of the 312 K Theta-e isosurface and the trowal airstream from a Northern perspective for the 1 April 1997 case (2.64 Mb)

A perspective on the vertical displacement associated with the trowal airstream is given by this view of the airstream from the east. The lower and upper limits of elevation reached by the airstream are indicated.

Animation of the Trowal airstream from an eastern perspective (50 Kb)

A more detailed presentation of the 1 April 1997 case can be accessed at the following World Wide Web address;
http://marrella.meteor.wisc.edu/cyclwkshp.html

The software used to animate the UW-NMS model output on this page is called VIS-5D. For more information on VIS-5D, and how you might get a version, click here.

Please send me your comments.

This research was supported by the National Science Foundation, Division of Atmospheric Sciences, Grant Number ATM-9505849.

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