1. Wellington VAAC Operations during the 2011 Puyehue-Cordon Caulle event Marcel Roux Manager, Wellington VAAC Meteorological Service of New Zealand Ltd

2. Focus Areas Ash detection Data exchange, collaboration and co- ordination Confidence levels on the Volcanic Ash Graphic Image Source: http://science.howstuffworks.com/dictionary/pet rology-terms/volcanic-ash1.htm http://science.howstuffworks.com/dictionary/pet rology-terms/volcanic-ash1.htm

3. Ash Detection Satellite Imagery – Infra-red and visible – Sulphur Dioxide imagery – Laser-radar imagery – Darwin VAAC Image Source: http://www.meted.ucar.edu/spaceweather/basic/m edia_gallery.php http://www.meted.ucar.edu/spaceweather/basic/m edia_gallery.php

4. Ash Detection Pilot Reports of Ash or No Ash – Routine receipt across NZ and between Australia and NZ. – Reports grounding flight operations

5. Ceilometer and LIDAR CL31 – ceilometer on certain of MetService’s AWSs 2 CL viewing licences. – 17 locations around NZ. NIWA operated LIDAR, located in Lauder Images Copyright Meteorological Service of New Zealand Limited 2012

6. Pilot Reports Evidence of ash and no ash in satellite imagery Conflicting Pilot Reports – NO ASH and ASH reports over similar flight routes. Image Source: http://franksemails.com/pics/erj190-in- argentina/

7. MTSAT Imagery MTSAT imagery courtesy Japan Meteorological Agency 11 June 2011 0100UTC

8. MODIS Imagery Ash

9. Data Exchange, collaboration and co-ordination Civil Aviation Authority (CAA) Darwin VAAC Airways Corporation NZ Air New Zealand Flight Dispatch

10. Data Exchange, collaboration and co-ordination

11. Consistency

12. Possible VAG Confidence Levels Confidence in the position of lateral boundaries of ash cloud – High = Black – Medium = Blue – Low = Red Same technique could be used to assess confidence in the vertical extent

13. Confidence of Vertical Extent Objective confidence levels – IR Temp and Sounding vs Lidar, Radar and PIREP – Amount of consistent observations Image Copyright Meteorological Service of New Zealand Limited 2012 Image Courtesy of the National Institute of Water and Atmospheric Research

14. Example of Confidence Technique

16. Example Confidence Chart