The Return of the Clouds The Return of the Clouds
Are Clouds Self-Organised Critical Systems?
Gillian Cupitt
The Return of the CloudsThe Return of the Clouds
What is Self-Organised Criticality?
Examining Fractals in clouds
Looking for periodicity
What is Self-Organised Criticality?What is Self-Organised Criticality?
Self-Organised Criticality is characterised byContinuous Change
High Sensitivity to External
conditions
Events on all Scales
http://www.sst.ph.ic.ac.uk/kim/research/rice.html
Self-Organised CriticalitySelf-Organised Criticality
Some indicators:Regular distribution of catastrophic events
“1/f” noise
FRACTALS
FractalsFractals
Self-Similarity
http://vortex.plymouth.edu/clouds.html
FractalsFractals
Non-linear dimensions1 D
2 D
1.54 D ??
http://classes.yale.edu/math190a/Fractals.html
The PictureThe Picture
http://www.ghcc.msfc.nasa.gov
Fractal AnalysisFractal Analysis
Fractal AnalysisFractal Analysis
Fractal AnalysisFractal Analysis
Fractal AnalysisFractal Analysis
OBEYING A POWER LAWOBEYING A POWER LAW
Finding the dimension…Finding the dimension…
1 - D = gradient of line
D = 1.1
NOT AN INTEGER!
Do All clouds have fractals???
PERIODICITY IN CLOUDSPERIODICITY IN CLOUDS
An insight into MATLAB and its errors…
PART 2:
Fourier Transform
AcknowledgementsAcknowledgements
Per Bak, “How nature works”, 1947Neeraj Sharma, for sharing his ideas
and resultsIver Cairns for guidanceMatlab
People who listened to
me whinge about Matlab