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Originally posted by carole9999
The only part of this I find truly unusual is that the same people come out every single time there is a mention of this issue with vehemently zealous (attack mode), then they are hardly never on ATS--until the next time. Now that's odd.
Originally posted by weedwhacker
StellarX, regarding your post, bottom of page 7, first picture on top...
'chemtrail'?!?!?! Do you mean those compact, less than 200-foot-wide (66 metre) CONTRAILS? The ones that clearly show the passage of at least three commercial jets, who all were flying the same Airways, and turned at the same VOR...whilst the upper winds, differing winds, depending on altitude, showed the drift of the persistent CONTRAILS? Are those what you are pointing out?
So, somehow, a skinny 'chemtrail' at 35,000 feet will somehow affect something on the ground?!? How? I daresay, if someone wanted to spray us with chemicals, they would do it at a much lower altitude.
How many cropduster airplanes have you seen dusting crops from 35,000 feet? Or, 20,000 feet? Or even 10,000 feet?
Perhaps less Internet nonsense and moe science would be in order here...
One unique type of cloud is manmade. Contrails occur when exhaust from jet engines condenses. A narrow line of moisture makes up the contrail. Winds eventually dissipate it; in some instances conditions permit the contrail to survive for many minutes (their straight lines do distort). Contrails are believed to affect weather by raising both short and long-term temperatures (one estimate is for about a third of a degree per decade). Here is a MODIS image taken over the southeast U.S. on January 29, 2004 showing a large number of contrails (at times more than 2000 planes are over the North American continent at any one time):
rst.gsfc.nasa.gov...
The condensation trails (contrails) that form in the wake of high-flying jets are another interesting example. These cylindrical clouds have variable lifetimes and water concentrations depending on environmental conditions. In some cases the contrails can persist for many minutes. But they do slowly diffuse, much like the smoke plume emitted by an acrobatic aircraft
www.sciam.com...
Contrail formation typically occurs in the upper Troposphere between nine and twelve kilometers is height with temperatures ranging between -35ƒC and -55ƒC (Jensen e. al. 1998, Schrader 1997). Most contrails last on the order of seconds to a few minutes and only a small minority will last for hours as in the contrails photographed (Jensen et. al. 1998). A newly formed contrail will be approximately one kilometer wide and one-half a kilometer tall. As a contrail evolves, it grows greatly in the horizontal plane sometimes extending over 20 kilometers in width (Spinhirne et al. 1998). Examples of this horizontal evolution is shown in the photograph. Contrails can also be 100ís of kilometers long given the right atmospheric conditions and a plane on a steady course.
Long lasting contrails like the ones observed usually occur in parts of the sky that have preexisting patches of cirrus clouds. Since the cirrus clouds are formed of ice crystals like the contrails, cirrus clouds in a region of the sky suggests supersaturation with respect to ice and sufficient heterogeneous nuclei for ice crystals to form (Jenson et al. 1998). The GOES-8 satellite photographs, Figure 3 and Figure 4, taken at approximately at the same time as the contrails were present shows significant cirrus clouds around the Norman area providing a condition necessary for contrail persistence.
students.ou.edu...
Persistent contrail formation requires air that is ice-supersaturated (Brewer, 1946). Ice-supersaturated air is often free of visible clouds (Sassen, 1997) because the supersaturation is too small for ice particle nucleation to occur (Heymsfield et al., 1998b). Supersaturated regions are expected to be quite common in the upper troposphere (Ludlam, 1980). The presence of persistent contrails demonstrates that the upper troposphere contains air that is ice-supersaturated but will not form clouds unless initiated by aircraft exhaust (Jensen et al., 1998a). Aircraft initiate contrail formation by increasing the humidity within their exhaust trails, whereas local atmospheric conditions govern the subsequent evolution of contrail cirrus clouds. Indeed, the ice mass in long-lasting contrails originates almost completely from ambient water vapor (Knollenberg, 1972).
Originally posted by StellarX
Originally posted by weedwhacker
StellarX, regarding your post, bottom of page 7, first picture on top...
'chemtrail'?!?!?! Do you mean those compact, less than 200-foot-wide (66 metre) CONTRAILS? The ones that clearly show the passage of at least three commercial jets, who all were flying the same Airways, and turned at the same VOR...whilst the upper winds, differing winds, depending on altitude, showed the drift of the persistent CONTRAILS? Are those what you are pointing out?
Indeed. So your admitting that commercial planes are suddenly flying in formations these days?
So, somehow, a skinny 'chemtrail' at 35,000 feet will somehow affect something on the ground?!? How? I daresay, if someone wanted to spray us with chemicals, they would do it at a much lower altitude.
Why presume that i believe they are trying to poison us with chemicals from the sky when they have proven themselves quit adept and efficient by putting fluoride in drinking water? I am fairly confident that any adverse health effects chem trails cause are entirely incidental.
How many cropduster airplanes have you seen dusting crops from 35,000 feet? Or, 20,000 feet? Or even 10,000 feet?
Obviously non unless computer technology and information processing has developed to such a state that they can predict downwind fallout patterns to the acre.
Should i move on to how the supposed experts admits that contrails are very badly understood atmospheric phenomenon?
Stellar
Originally posted by utmostbastard
Finally the irony that we must have a weatherman and pilot on every thread immediately telling you what you don't see.
Some of us can still think for ourselves believe it or not.
Originally posted by OzWeatherman
I have seen a few of these things posted by some users, claiming that they are from the government spraying chemicals into our atmosphere and frankly I have had a gutful. So I am posting pictures with explanations so hopefully some of you will take not and maybe be more aware of the REAL process in which these beautiful atmopsheric phenomene are formed
First is irdescent clouds or iriastion. This occurs when small uniform water droplets or ice crystals diffract sunlight causing a brilliant array of colurs to appear in the cloud. Commonly occurs in altocumulus and cirroform clouds when the cloud is in its formation phase. Example in link
apollo.lsc.vsc.edu...
Secondly is the sundog phenomena....and no it is not Nibiru or Planet X people, nor is it created by humans. Sundogs occur when sunlight passes through horizontal plate ice crystals in cirroform clouds. They are commonly seen when the sun is low on the horizon. Example below
www.polarbearalley.com...
Third up is the halo. There are many types of halo so I wont go into too much depth. Halos occur when ice diffracts light. Different angles of the ice make different patterns, from full cirlces around the sun or moon, to tangent arcs. Halos are actually more common than and are most often seen in cirrostratus cloud. The example is of a parhelic circle halo, which is often seen with sundogs
www.stormeyes.org...
Fourth is Nacreous and Noctilucent clouds. These are unlike the other cloud types because they lie in the stratosphere rather than the troposphere (which is where normal clouds are found) Both can be brilliant colours, and are still visible after the sun has set. They are both seen at the higher latitudes but have been known to be seen as far south as Utah. First example is a Nacreous cloud and the second is a Noctilucent cloud
www.physics.otago.ac.nz...
www.dundeecity.gov.uk...
So there you go, these are all natural and have nothing to do with the government poisoning us. Please note that the halos and sundogs do form in contrails from aircraft as the exhaust freezes in the super cool environent. Also take note that contrails do persist and spread across the sky in some cases. In the meteorological world, a contrail is reported as cirrus cloud when it is still visble after half an hour. So to all those that say contrails dissipate.....you are wrong :p
:
Originally posted by Pilot
yes and are you one of the experts?
Ok I looked thru the chaff and found the "explanation" and I can't tell if the poster in question even looked at my photo...the explanation of varying temperatures and altitudes re that photo to me is simplistic and counterintuitive. I don't accept it. Sorry.
[edit on 13-3-2008 by Pilot]
Originally posted by ThatsJustWeird
[..] that was started for the sole purpose of scaring people and no other reason whatsoever, to carry out whatever agenda you have.