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CNOSSOS-EU

Temperature / rel. Humidity / Windsp.

see ISO 9613 (1996) and ISO 9613 (2024)

Meteorology

Via the button „Meteorology“ the percentage of „favorable conditions“ in wind sectors stepped by 20° can be specified for the time periods D/E/N separately. The percentage refers to the assessment interval, usually an entire year.

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For now, predefined data is only available for France and Finland. For France, following options are available:

  • (default): favorable conditions D/E/N = 50/75/100%
  • (favorable): favorable conditions D/E/N = 100/100/100%
  • (homogène): favorable conditions D/E/N = 0/0/0%
  • XXX (2) and XXX (3) with „XXX“ representing a French town and region: data of the percentage of favorable conditions for two (2: D, N) or three time periods (3: D, E, N) according to NMPB 2008.

Note

The items XXX (1996) only apply when using NMPB 1996 (see NMPB-Routes 1996).

Notes:

  • „Favorable conditions“ are such facilitating the propagation of sound (i.e. which are likely to cause a higher sound pressure level at the receiver point). This situation makes use of the (spectral) ground attenuation for downwind propagation conditions as specified in ISO 9613-2 ISO-9613-1.

  • The „homogeneous condition“ does not refer to any specific meteorological situation. In fact, the rays are straight lines, not accounting for any atmospheric influence. This kind of meteorological situation has been applied by all former prediction models used in France.

Evening Values = Day Values

With this option active the daytime values will be applied for the Evening period as well.