Wolkenvormen zijn uitdrukkingen van het onderliggende landschap, grote fenomenen en soms lokale menselijke activiteiten.
“Ook komt de Wereld Meteorologische Organisatie (WMO) met een aanduiding voor wolken zoals vliegtuigstrepen die door menselijke activiteit zijn ontstaan: 'homogenitus', ofwel 'door de mens gemaakt'.”
Ik lees ondermeer over deze menselijk beinvloede wolken:
“2.2.2. Anthropogenic clouds
126.96.36.199. In a paper [Reference 3] "Clouds caused by human activities", published in the Royal Meteorological Society's journal 'Weather' in November 2012 (Volume 67:11), J. Mazon, M. Costa, D. Pinto and J. Lorente proposed that clouds clearly arising from human activity should be designated with the prefix 'anthropo-'/(a) to differentiate them from clouds of natural origin. In the case of aircraft condensation trails (contrails) spreading out into cirri-form clouds, the author's proposed that these anthropogenic clouds (anthropo-clouds) should be classified as: anthropoCirrus (aCi), anthropoCirrocumulus (aCc) and anthropoCirrostratus (aCs). In their paper, Mazon et al also consider other examples of clouds produced by human activities, such as anthropoCumulus and anthropoStratus .
188.8.131.52. The Task Team accepted that there was a case for the specific classification of clouds caused by human activities. The prime example being that of aircraft condensation trails (contrails). It is well known that in certain atmospheric conditions contrails may persist and, with time, these may then spread under the influence of the upper winds to cover large parts of the sky in cirriform clouds.
184.108.40.206. The current ICA states: -
II.6.3 Condensation trails (contrails)
Contrails are clouds which form in the wake of an aircraft when the atmosphere at flying level
is sufficiently cold and humid. When just formed, they have the appearance of brilliant white
streaks; soon however they show pendant swellings like inverted mushrooms. Often they are
short-lived, but especially when Cirrus or Cirrostratus is present, they may persist for several hours.
Persistent trails spread progressively, frequently forming large patches of fluffy or fibrous clouds,
having the appearance of Cirrus or patches of Cirrocumulus or Cirrostratus; in fact it is sometimes
impossible to distinguish old contrails from these clouds.
II .6.7 PART II - 6. SPECIAL CLOUDS
Clouds resulting from industry
These clouds have very diverse origins; the following are mentioned only as examples: clouds
of smoke and steam in industrial areas, smoke clouds created for frost protection purposes, clouds
of insecticide gas or powders in agricultural areas.
Clouds resulting from explosions
When an explosion is very large, it is usually accompanied by a cloud of smoke and dust.
Above this cloud, velum or pileus are often seen. Sometimes the propagation of shock waves is
manifested by dark rings or bands moving with extreme rapidity.
220.127.116.11. The Task Team noted that the prefix 'anthropo-' is derived from the Greek word for man-made and expressed the view that it would not be desirable to mix Greek with Latin in the cloud classification scheme. Also the cloud classification scheme utilises suffixes for 'mother-cloud s, rather than prefixes, as per the following sections from the ICA:-“