Observations and Modelling of Fronts and Frontogenesis

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Figure 11.12 Horizontal wavenumber spectra and coherence,
ensemble averaged and band averaged to 5 bands
per decade, a) Spectra of horizontal
temperature gradient at 15, 23, 31, 50, and 70
m. (95% confidence intervals as in Figure 8)
b) Dashed lines: Coherence from cross-spectra
between 15 rn and 23, 31, 50, and 70 m
horizontal temperature gradients. Solid line:
95% significance level for non-zero coherence.
40