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4. Remarks—Climatic impact
It is interesting that the mean optical depth found in this case (0.35) corresponds to that found in climatological satellite measurements by Ponater et al. (2002) and Minnis et al. (2004), and that the microphysical properties are consistent with a wide range of observations and models by prior authors. Accordingly, it is appropriate to speculate on their effect on climate.
The issue of the impact of contrail-generated cirrus (CS) on climate change has been treated by a number of investigators. Sassen (1997) suggested that the unusually small particles typical of many persistent contrails might favor the albedo cooling over the greenhouse warming. Using a 2D mesoscale cloud model Khvorostyanov and Sassen (1998) computed the distribution of the mean crystal radius, concentration, and ice water content of a contrail after 30 min of development. They found a twofold effect. At the surface, the net greenhouse minus albedo effect was negative with a cooling of 15 W m−2. However, at the top of the atmosphere (corresponding to the entire atmospheric column), the net effect was a warming of 8 W m−2. We note that the latter simulation for the early stage of the cloud produced very large concentrations of small crystals and that the longwave warming would be increased relative to the shortwave cooling with the much larger particles, such as found in the present study.
Originally posted by Phage
reply to post by AllSeeingI
If the testing were being done under hot conditions, why are there more "chemtrail" reports during the winter and early spring than during the summer? Why are "chemtrails" rarely seen in the tropics. Wouldn't that be a really good place for testing?
This Journal suggests that there is research into creating condensation trails which expand to cirrus with the intent of controlling weather and temperatures.... as I have thought.
Anchor Pattern- Unless otherwise stated, a left hand race track pattern with legs
separated by a minimum of 20 NM and a minimum leg length of 50 NM.
"By most accounts, the leading contender is stratospheric aerosol particles," said climatologist John Shepherd of Britain's Southampton University.
The particles would be sun-reflecting sulfates spewed into the lower stratosphere from aircraft, balloons or other devices – much like the sulfur dioxide emitted by the eruption of the Philippines' Mount Pinatubo in 1991, estimated to have cooled the world by 0.5 degrees C (0.9 degrees F) for a year or so.
Engineers from the University of Bristol, England, plan to test the feasibility of feeding sulfates into the atmosphere via a kilometers-long (miles-long) hose attached to a tethered balloon.
Shepherd and others stressed that any sun-blocking "SRM" technique – for solar radiation management – would have to be accompanied by sharp reductions in carbon dioxide emissions on the ground and some form of carbon dioxide removal, preferably via a chemical-mechanical process not yet perfected, to suck the gas out of the air and neutralize it.
Originally posted by Phage
reply to post by AllSeeingI
A KC-135. A tanker. Why do you say it was not a holding pattern?