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Histograms and composites. multimodal is always interesting. qualitative distinction! Regimes or modes (literal meaning). Buoy downwelling radiation along Pacific cold tongue as TIWs go by in the ocean.

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PowerPoint Slideshow about ' Histograms and composites' - ghalib


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Presentation Transcript
multimodal is always interesting
multimodal is always interesting
  • qualitative distinction!
  • Regimes or modes (literal meaning)
slide4

Figure 3.16 – Width vs. top height of each EO for 16 June 2006 – 31 May 2008. Distribution is weighted by total number of pixels (volume) per EO to emphasize larger EOs. Bin size is 10 pixels (~ km) by 240 m. Width is the horizontal span of the EO.

the science
The science
  • bimodal = 2 “modes” = distinct “regimes”
    • wet and dry
    • young and old air masses (age since saturation)
      • in temporal variations at a point
    • convective vs. nonconvective regions

in bimodal climatological mean spatial histograms

slide19

indeed all similar

  • except offset
slide20

indeed very similar

  • except offset
slide21

Khairoutdinov, Marat, David Randall, 2006: High-Resolution Simulation of Shallow-to-Deep Convection Transition over Land. J. Atmos. Sci., 63, 3421–3436.

High-Resolution Simulation of Shallow-to-Deep Convection Transition over Land

Marat Khairoutdinov and David Randall

Nice use of 2-dimensional histograms, and weighted histograms (= composites of multiple fields in each bin)

Clouds as connected regions (have a size)

slide23

all points

w > 5m/s

slide24

conditional sampling

  • cetegories so arbitrary unless there are multiple modes in some distribution
suppose we want precip flux
suppose we want precip flux
  • F = (frequency)(qp)(w)(density)
  • Product of these 3 distributions (*density)
  • rare events clearly important
  • from obs, would need to adjust (sampling)
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