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Pure random process Up: 8.8
Examples Previous: 8.8.1
Hourly measurements of
8.8.2 Hourly measurements of
temperature
Figure 8.4 shows that the measurements of temperature for the same period
have quite a different spectrum. The same processes can be detected, but
their relative contributions are quite different. The diurnal cycle is
even more prominent, and there is a strong annual cycle (at about 10-4
h-1) not present in the spectrum for the pressure. The short-wave
contributions are not as dominant as they were for pressure; instead, there
are stronger contributions with periods ranging from about 5-40 days and
spanning the periods expected for long-wave weather systems. The variations
with periods of a few hours make a much larger relative contribution to
the temperature variance than to the variance in pressure.
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Figure 8.4: Variance spectrum similar to that in the preceding
figure, for hourly measurements of temperature.
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