Author Last Revised: April 11, 2010.
Sunday, March 28, 2010 was an incredible day of trails in Milan, as we have not seen since time immemorial. Could be observed throughout the day frequent passages, often multiple, of aircraft wake. Most of the trails were of a persistent and have given rise to spectacular junctions, and shadows.
The day began with a spotless blue sky that gradually is colored white. At one point the sky was mostly covered by the expanded trails and cirrus clouds (a significant effect of coverage and certainly not beautiful, in contrast to the spectacle of a long white trail that extends in a blue sky). After a day the sky was still relatively clean, with a nearly full moon visible.
Now, for me that I am passionate about photography contrail a day like this was the best you could ask for after a winter mean of trails and skies almost always covered.
Those who believe in the "theory" of the evil of the air tanks he could get through the day in different ways.
In today's post I start to post some photos of the day and the usual brief analysis of weather data. Weather permitting, I plan to post more photos of this exciting day of contrails. Lufthansa Airbus A321
Vueling Airbus A320
Contrails Against the sun
In Hoc Signo Vinces!
Contrail Shadow
Crossing
Contrail up close
Vueling Airbus A320
Let's look at the analysis of weather data recorded by the radiosonde launched from the station at Milan's Linate 12Z .
temperatures at typical flight altitudes were low, with a peak of -65.7 ° C at 11,286 m. As can be seen clearly from the diagram of Appleman it had net conditions for the formation of condensation trails from 9130 m up.
And with regard to the persistence? These were the conditions for the formation of persistent contrails? If we construct the usual chart relative humidity and temperature, we see that were not the conditions for persistence.
The absence of conditions for the persistence and the observation of persistent contrails could be seen as an anomaly, if not that, as we all know by now, the RS92 radiosonde, according to Milan, suffers from an error due to solar radiation. Marcov MarkoGTS and have recently developed a very useful program that allows you to adjust the values \u200b\u200bof relative humidity sensor Vaisala RS92 based on the work of Miloshevich LM et al. (1) knowing the elevation of the sun on the time of radiosonde.
The probe started at 10:52 Z and came to 10.3 million meters at 11:26 Z with (assuming a rate rise of 5 m / s). At that time the solar elevation in Milan was of 47.6 °.
With this data, using the software we build the correct graph relative humidity / temperature, this time, shows relative humidity values \u200b\u200bwell above the saturation on ice. I remember however that it is desirable that the program and the calculation method was verified by an expert in the field, perhaps from the same Miloshevich and that until then it would be advisable to take the test results with caution
The observation of normal airliners and checking the presence of conditions for the formation and persistence (after correction) of condensation trails show that the best explanation for contrails Sunday 28 is observed in case of contrails , that ice clouds.
who believes in the existence of chemtrails might consider fanciful alternative explanations (for example, would be observed contrails chemtrails issued by evil tanker repainted to look carefully airliners) but of course such an explanation should be supported in some way.
Reference (1) Miloshevich, LM, H. Vömel, D. N. Whiteman, and T. Leblanc (2009), Accuracy assessment and correction of Vaisala RS92 radiosonde water vapor Measurements, J. Geophys. Res, 114, D11305, doi: 10.1029/2008JD011565.
Copyright notice.
Copyright © 2010 - All rights reserved. All rights reserved. To request a reproduction of the photos send an e-mail: sciemilano@yahoo.it.
The day began with a spotless blue sky that gradually is colored white. At one point the sky was mostly covered by the expanded trails and cirrus clouds (a significant effect of coverage and certainly not beautiful, in contrast to the spectacle of a long white trail that extends in a blue sky). After a day the sky was still relatively clean, with a nearly full moon visible.
Now, for me that I am passionate about photography contrail a day like this was the best you could ask for after a winter mean of trails and skies almost always covered.
Those who believe in the "theory" of the evil of the air tanks he could get through the day in different ways.
In today's post I start to post some photos of the day and the usual brief analysis of weather data. Weather permitting, I plan to post more photos of this exciting day of contrails. Lufthansa Airbus A321
Vueling Airbus A320
Contrails Against the sun
In Hoc Signo Vinces!
Contrail Shadow
Crossing
Contrail up close
Vueling Airbus A320
Let's look at the analysis of weather data recorded by the radiosonde launched from the station at Milan's Linate 12Z .
temperatures at typical flight altitudes were low, with a peak of -65.7 ° C at 11,286 m. As can be seen clearly from the diagram of Appleman it had net conditions for the formation of condensation trails from 9130 m up.
And with regard to the persistence? These were the conditions for the formation of persistent contrails? If we construct the usual chart relative humidity and temperature, we see that were not the conditions for persistence.
The absence of conditions for the persistence and the observation of persistent contrails could be seen as an anomaly, if not that, as we all know by now, the RS92 radiosonde, according to Milan, suffers from an error due to solar radiation. Marcov MarkoGTS and have recently developed a very useful program that allows you to adjust the values \u200b\u200bof relative humidity sensor Vaisala RS92 based on the work of Miloshevich LM et al. (1) knowing the elevation of the sun on the time of radiosonde.
The probe started at 10:52 Z and came to 10.3 million meters at 11:26 Z with (assuming a rate rise of 5 m / s). At that time the solar elevation in Milan was of 47.6 °.
With this data, using the software we build the correct graph relative humidity / temperature, this time, shows relative humidity values \u200b\u200bwell above the saturation on ice. I remember however that it is desirable that the program and the calculation method was verified by an expert in the field, perhaps from the same Miloshevich and that until then it would be advisable to take the test results with caution
The observation of normal airliners and checking the presence of conditions for the formation and persistence (after correction) of condensation trails show that the best explanation for contrails Sunday 28 is observed in case of contrails , that ice clouds.
who believes in the existence of chemtrails might consider fanciful alternative explanations (for example, would be observed contrails chemtrails issued by evil tanker repainted to look carefully airliners) but of course such an explanation should be supported in some way.
Reference (1) Miloshevich, LM, H. Vömel, D. N. Whiteman, and T. Leblanc (2009), Accuracy assessment and correction of Vaisala RS92 radiosonde water vapor Measurements, J. Geophys. Res, 114, D11305, doi: 10.1029/2008JD011565.
Copyright notice.
Copyright © 2010 - All rights reserved. All rights reserved. To request a reproduction of the photos send an e-mail: sciemilano@yahoo.it.
