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Histograms and compositesPowerPoint Presentation

Histograms and composites

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## PowerPoint Slideshow about ' Histograms and composites' - ghalib

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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

Figure 3.16 go by in the ocean – 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.

soundings go by in the ocean

climatological time means go by in the oceanmust not be iid sums (->normal dist)

The science go by in the ocean

- 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

Even unimodal can be a basis for composites, but these aren’t “regimes”

- indeed all similar aren’t “regimes”
- except offset

- indeed very similar aren’t “regimes”
- except offset

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)

growing clouds in z and size Simulation of Shallow-to-Deep Convection Transition over Land. J. Atmos. Sci., 63, 3421–3436.

all points Simulation of Shallow-to-Deep Convection Transition over Land. J. Atmos. Sci., 63, 3421–3436.

w > 5m/s

- conditional sampling Simulation of Shallow-to-Deep Convection Transition over Land. J. Atmos. Sci., 63, 3421–3436.
- cetegories so arbitrary unless there are multiple modes in some distribution

suppose we want precip flux Simulation of Shallow-to-Deep Convection Transition over Land. J. Atmos. Sci., 63, 3421–3436.

- 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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