Citat:
Ursprungligen postat av
WilleGarvin
Eller så ser du en kombination av contrails och naturlig molnbildning. Contrails går nästan alltid hand i hand med cirrusmoln, när det skapas contrails så skapas det (nästan alltid) även cirrusmoln. Och detta av den enkla anledningen att när det finns förutsättningar för att skapa contrails så finns det även förutsättningar för att det ska skapas cirrusmoln.
Om du gräver fram fotografier av det du tror är chemtrails kan jag lova att vi även kommer se cirrusmoln i 9 av 10 fotografier.
Missade du wikipedia sidan jag skickade till dig som visar hur flygplanstrimmor blir till moln?
jag skickar väl igen då.
Min fråga är hur ofta detta sker? Du gissade att dessa moln tar bort mindre än 1% soltimmar i t.ex. Göteborg. Min uppfattning är att det är mycket högre. Men du menar att din uppfattning om 1% är mer korrekt än min på 10%+ då?
Artikeln heter "Anthropogenic cloud".
På svenska, "antropogent" som betyder "orsakat av människan" eller "relaterat till mänsklig aktivitet."
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High homogenitus
"Condensation trails with Cirrocumulus homogenitus (Cch) and Cirrostratus homogenitus (Csh) observed over Barcelona (Spain, November 2010).
Sequence of photos showing how a contrail turns into a cirrocumulus homogenitus
Despite the fact that the three genera of high clouds, Cirrus, Cirrocumulus and Cirrostratus, form at the top of the troposphere, far from the earth surface, they may have an anthropogenic origin.
In this case, the process that causes their formation is almost always the same: commercial and military aircraft flight. Exhaust products from the combustion of the kerosene (or sometimes gasoline) expelled by engines provide water vapor to this region of the troposphere.
In addition, the strong contrast between the cold air of the high troposphere layers and the warm and moist air ejected by aircraft engines causes rapid deposition of water vapor, forming small ice crystals. This process is also enhanced by the presence of abundant nuclei of condensation produced as a result of combustion. These clouds are commonly known as condensation trails (contrails), and are initially lineal cirrus clouds that could be called Cirrus homogenitus (Cih). The large temperature difference between the air exhausted and the ambient air generates small-scale convection processes, which favor the evolution of the condensation trails to Cirrocumulus homogenitus (Cch).
Depending on the atmospheric conditions at the upper part of the troposphere, where the plane is flying, these high clouds rapidly disappear or persist. When the air is dry and stable, the water rapidly evaporates inside the contrails and can only observed up to several hundreds of meters from the plane. On the other hand, if humidity is high enough, there exists an ice oversaturation, and the homogenitus get wide and can exist for hours. In the later case, depending on the wind conditions, Cch may evolve to Cirrus homogenitus (Cih) or Cirrostratus homogenitus (Csh). The existence and persistence of these three types of high anthropogenic clouds may indicate the approximation of air stability. In some cases, when there is a large density of air traffic, these high homogenitus may inhibit the formation of natural high clouds, because the contrails capture most of the water vapor."
https://en.wikipedia.org/wiki/Anthropogenic_cloud
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