posted on Mar, 24 2011 @ 08:53 AM
I found this while I was researching some contrail information on another thread. This study is on contrails turning into clouds. I feel that it
contains enough information to reside in it's own thread. I do not have alot of time so I personally do not wish to argue ( I mean debate) over it
right now. I cannot, even if I wanted to due to time constraints. So please if you are interested, there is enough exact science and information to
last a while. Feel free to comment or debate amongst yourselves. I feel that this is what we all have been looking for.
I posted some of the information in another thread and I did not see anybody say that they have seen it before. I like this study because the minimum
age for a contrail to be in this study is 2 hours. Here it goes. Tighten your chin strap,... because my head about exploded trying to decipher the
This work is two pronged, discussing 1) the morphology of contrails and their transition to cirrus uncinus, and 2) their microphysical and radiative
properties. It is based upon the fortuitous occurrence of an unusual set of essentially parallel contrails and the unanticipated availability of
nearly simultaneous observations by photography, satellite, automated ground-based lidar, and a newly available database of aircraft flight tracks.
The contrails, oriented from the northeast to southwest, are carried to the southeast with a component of the wind so that they are spread from the
northwest to southeast. Convective turrets form along each contrail to form the cirrus uncinus with fallstreaks of ice crystals that are oriented
essentially normal to the contrail length. Each contrail is observed sequentially by the lidar and tracked backward to the time and position of the
originating aircraft track with the appropriate component of the wind. The correlation coefficient between predicted and actual time of arrival at the
lidar is 0.99, so that one may identify both visually and satellite-observed contrails exactly. Contrails generated earlier in the westernmost flight
corridor occasionally arrive simultaneously with those formed later closer to the lidar to produce broader cirrus fallstreaks and overlapping
contrails on the satellite image. The minimum age of a contrail is >2 h and corresponds to the longest time of travel to the lidar. The lag between
the initial formation of the contrail and its first detectability by Moderate-Resolution Imaging Spectroradiometer (MODIS) is ≈33 min, thus
accounting for the distance between the aircraft track and the first detectable contrail by satellite. The lidar also provides particle fall speeds
and estimated sizes, optical extinction coefficients, optical thickness (τ = 0.35), and ice water path (IWP = 8.1 g m−2). These values correspond
to the lower range of those found for midlatitude cirrus by Heymsfield et al. The ice water per meter of length along the cloud lines is 103–104
times that released by typical jet aircraft. The synthesis of these findings with those of prior investigators provides confidence in the present
results. Various authors find that contrail-generated cirrus such as reported here contribute to net regional warming.
Received: December 27, 2004; Accepted: June 30, 2005
This is a little further down the page. Photos are below.
At about 1100 LT (1500 UTC) on 7 September 2003 the lead author noticed a series of contrails apparently emanating from some point to the southwest of
his residence in Silver Spring, Maryland. Some of these had already been converted to cirrus uncinus with fallstreaks and others were being
transformed as he watched. At about 1530 UTC he began to photograph these clouds for their aesthetic interest with no intent to study them
scientifically. Thus, he did not record the exact time. Figure 1 was taken toward the south at a central elevation of about 25°. There are four lines
of clouds (1–4), and probably a fifth (5), that appear to emerge from the southwest in the lower right corner of the picture. All of these had been
contrails during the previous hour as he watched. Otherwise the sky was clear. The youngest of these is obviously 1.
To obtain the geometric structure of the clouds we used a telescope to measure the elevation angles of points X and Y on the building at the left. The
azimuth angles were measured with a compass and corrected for the 12° magnetic declination west of true north. Using the 10-km height of the
cloud-generating level obtained from the lidar (see Fig. 5) we computed the horizontal scales (L) on the right of Fig. 1 from tan(ψ) = (10/L), where
ψ is the elevation angle and L is the horizontal distance from the zenith point above the observer. To estimate distances from left to right across
the image use the portion of the scale centered at the appropriate elevation angle. As the elevation angle decreases one sees that the spacing of the
cloud lines 1 and 2 is ≈5 km regardless of the angle of view. In short, they are parallel to one another; their apparent convergence is due only to
perspective. The same is true for the other cloud lines. We shall discuss the size of the cloud elements later.
This is even further down the page.
a. Contrail orientation and spacing
From the Figs. 1, 2 and 3a we have seen that the contrails are oriented toward the northeast. Their spacing is ≈4–5 km. The motion of the base of
the fallstreaks is toward ≈58°, consistent with the winds at and below the generating level, and the orientation of the bands.
The horizontal dimension of the tufts in line 1 is ≈1 km and their spacing is also ≈1 km regardless of ψ. The older contrail clouds in line 2
have dimensions of ≈1 by 2 km at all ψ. And the largest dimension of the ice crystal fallstreaks are typically 2 km wide. Similarly, we have seen
that all of the prior cloud lines (1, 2, 3) are parallel to one another although their spacing depends upon their relative age, that is, the time
between successive aircraft flights.
See the article in the link for more reading. I am still trying to understand some of the graphs and charts.
Here is figure 1 pic... Under part a.... Photograph
Here is figure 2 pic... Under part b... satellite observations.
As I stated, I thought this was interesting for the "chemmy" battle, I mean debate. That is exacly how I see it. Please post your thoughts on this
information. I will not belittle you. Just please do not belittle me. I have serious doubts and questions on the whole chemtrail conspiracy. This is
my opinion and I thought I would share my findings with everyone. If this has been posted the I apologize.
Please tell me what you think.....
Thank you for reading, LJ01
One more thing I think the chemtrail thing is out of control. I thought I would add to some of the chaos.