Cattiaux et al. (2016)

[Thomasjkeel]

Title: Sinuosity of midlatitude atmospheric flow in a warming world
DOI: http://doi.wiley.com/10.1002/2016GL070309
Status: To verify
Type: Sinousity Metric

Metric description

A sinousity metric for upper-air flow. "For each day, the value of the selected isohypse precisely corresponds to the Z500 average over 30–70∘N [...] Here we primarily focus on the total perimeter of the isohypse to derive the sinuosity but also consider its latitudinal range (maximal and minimal latitudes reached by the isohypse), including potential cutoff highs and lows"

To do

Perhaps include maximal and minimal latitudes?

Known problems

Need to verify as the values are slightly different (could be related to the geopotential data or resolution).

Great circle distance along isohype or not?

See my own example of geopotential sinousity problem:
Lines up nice:

Not so nice:

Other notes

Looks at 'waviness' of upper-air flow rather than jet-stream specifically.
Also see: https://advances.sciencemag.org/lookup/doi/10.1126/sciadv.aay2880

[Thomasjkeel]

For each day, the average 500-hPa geopotential height between 30° and 70°N was calculated to find the line of constant geopotential height that corresponds to approximately 50°N. PROBLEM WITH HOW THIS CONSTANT LINE IS CALCULATED

[Thomasjkeel]

Verification needed! Sinuosity score does not quite line up... might be the data?