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Polishing the Plume
A New Visualization of Multi-Model Ensemble
Forecasts Developed to Advance Climate
Prediction Research and Communication
Jennifer M. AdamsCenter for Ocean-Land-Atmosphere Studies
George Mason University
Google Image Search Results for “ENSO Plume”
The Whisk Brooms
Climate Diagnostics and Prediction Workshop, 2013
“Developing a More Reliable and Usable ENSO Prediction Plume”
by Tony Barnston, Mike Tippett, Huug van den Dool, and David Unger
An Early Failure
A Better Failure
The Wedding Cake
The Current Favorite
What Makes This Plume Shine?
• Histograms! Left-aligned for easy interpretation Colorized for quick readability Thin underline shows full range of values
• Less ink, more information• Clear identification of individual models • Individual and multi-model ensemble
means• The grey area between obs and forecasts
Histograms on TV
How To Draw Histograms With GrADS
• Sorting data and drawing histograms have not been implemented (yet).
• All the coding is done in the scripting language: Define the index in a dimension environment with E and T varying Parse results from ‘set gxout print’ output and populate a script variable Loop over data values, fill histogram bins, collect statistics Set up the X-Y space in the graphic with an invisible time series plot Use ‘q gr2xy’ and ‘draw recf’ to draw the histogram bars Scaling: Maximum mode value spans 90% of width between time steps,
so that no histogram overlaps the base of the subsequent histogram
Individual Model Plumes Initialized July
2015
Another Look at Individual Model Plumes(Click HERE to see in a browser)
Other Applications for the Plume
• Extended Indian Monsoon Rainfall (EIMR)
• Indian Ocean Dipole (IOD)• Point forecasts of daily maximum
temperature• Atmospheric teleconnection indices
Extended Indian Monsoon Rainfall Index(Precipitation Averaged over 70°E–110°E, 10°N–30°N, in mm/day)
Indian Ocean Dipole Index (Difference between area-averaged SST anomalies in the western and eastern Indian
Ocean)
Daily Max Temperature Forecast Plume(Click HERE to See Latest)
00z run
12z run
Next Target: The Cone of Uncertainty
Cones on TV
The HurriCone
Adopt the New Plume!
• The embedded histograms Declutter the plume Add useful information Improve readability
• Elegant distillation of ensemble information
• Useful for many weather and climate indicators