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originally posted by: stirling
SE Asia is largely COAL fired.....this creates an inordinate amount of the Sulphur stuff id say......
China uses a lot of coal and its smog is second only to Mexico city or maybe worse now....
Ther hole may be a cumulative event too......well have to wait and see because they WILL keep on using coal to power their industrialisation.....
What?
Your first paragraph
Actually, jets do encounter weather and turbulence because they fly mostly in the tropopause. Ever been on a jet? But as I said, the indications are that jet exhaust is in all likelihood O3 neutral whether or not they are above the tropopause. Some components enhance O3 production and others degrade O3.
I read that jets prefer the stratosphere for cruise because it is weather and turbulence free.
No. The Amazon is very far to the east of the "hole." Deforestation is definitely not a good thing but the "hole" is the result of thousands of miles of Pacific Ocean. It's probably been there since forever.
So deforestation and such (the Amazon) could have done this? Very interesting and horrible at the same time.
I can't say for certain but probably not much. Hydroxl is highly reactive with some compounds and acts as a "cleanser" by reacting with them, turning them into more innocuous compounds. The hydroxl "hole" allows things like CFCs and NO2 (and sulfates) to pass through the stratosphere in the tropical west Pacific without being neutralized. When these compounds descend (as part of stratospheric circulation) at high latitudes they enhance the degradation of O3 in polar regions. Except for extremely high altitudes, mid-latitudes are probably bypassed.
If OH has a lifetime of less than a second and if OH decreases with altitude and latitude anyway and since transport is from the equator to the poles, what does this hole mean for mid-latitudes?
Lastly, geo-engineers have proposed sulfur dioxide injections by projectiles, aircraft and balloons in order to mimic volcanoes and cool the planet. Was this actually done instead of just proposed the way we were all told? And did that create this hole? Because we really don't know squat about the atmosphere? - See more at: www.abovetopsecret.com...
Source
The pilot says, "We are now at our cruising altitude of 30,000 feet." Why do planes fly so high?
That altitude gets them out of the troposphere and into the stratosphere. Although the arc that they must travel is greater the further from the surface they get, fuel costs are lower because there is less friction due to the lower air density. Also, there is little air turbulence, which makes the passengers happier.
Stratosphere
There is little mixing between the stratosphere, the layer above the troposphere, and the troposphere below it. The two layers are quite separate. Sometimes ash and gas from a large volcanic eruption may burst into the stratosphere. Once in the stratosphere, it remains suspended there for many years because there is so little mixing between the two layers.
Source: National Center for Atmospheric Research
The bottom of the stratosphere is around 10 km (6.2 miles or about 33,000 feet) above the ground at middle latitudes. The top of the stratosphere occurs at an altitude of 50 km (31 miles). The height of the bottom of the stratosphere varies with latitude and with the seasons. The lower boundary of the stratosphere can be as high as 20 km (12 miles or 65,000 feet) near the equator and as low as 7 km (4 miles or 23,000 feet) at the poles in winter. The lower boundary of the stratosphere is called the tropopause; the upper boundary is called the stratopause.
Source: Boeing
The altitude for a typical transatlantic flight is 35,000 to 39,000 feet above sea level. Inside the cabin, the pressurized altitude is equivalent to 5,400 to 7,000 feet above sea level. (Denver, Colorado, U.S.A., is 5,280 feet above sea level, the center of La Paz, Bolivia, is 11,811 feet, and St. Moritz, Switzerland is 5,978 feet.)
That's what's missing from it - ozone. So I'm curious about the media spin and I'm curious about why not just call an ozone hole an ozone hole and I'm curious about what the basis is for assuming that this is in any way natural and has always been there.
www.awi.de...
Ozone, in turn, forms in the lower atmosphere only if there are sufficient nitrogen oxides there. Large amounts of nitrogen oxide compounds are produced in particular by intensive lightning over land. However, the air masses in the tropical West Pacific were not exposed to any continental tropical storms for a very long time during their transport across the giant ocean. And the lightning activity in storms over the ocean is relatively small. At the same time the lifetime of atmospheric ozone is short due to the exceptionally warm and moist conditions in the tropical West Pacific.
originally posted by: Wrabbit2000
I do wish they'd devote more time to studying what simple jet fuel exhaust does in the upper levels, by the sheer scale it occurs now. It doesn't necessarily require any nefarious plot at all for the mere by-product of burning the fuel to be doing potential damage. Not much in small numbers..but as some point out in other context, it's legion of flights per day in the modern world. Simple pollution takes all forms with all sorts of impacts, to be sure.
There are more things in heaven and earth, Horatio, Than are dreamt of in your philosophy. - Hamlet (1.5.167-8)
Most present-day jet aircraft cruise in an altitude range (9-13 km) that contains portions of the UT and LS...Determination of the partitioning of exhaust into the two atmospheric regions is complicated by the highly variable and latitudinally dependent character of the tropopause (i.e., the transition between the stratosphere and troposphere). Comparisons of aircraft cruise altitudes with mean tropopause heights has led to estimates for stratospheric release of 20-40% of total emissions (Hoinka et al., 1993; Baughcum, 1996; Schumann, 1997; Gettleman and Baughcum, 1999).
The world's busiest aircraft flight corridor between North America and Europe borders one of the most threatened sectors of the ozone layer, over the North Atlantic, which thins by up to 25 per cent in late winter. Every day, up to 500 civil aircraft in the corridor burst out of the troposphere and up into the stratosphere, with its fragile ozone layer. About 15 per cent of emissions from all civil flights come from these aircraft, and at least half their emissions issue straight into the stratosphere.
It could have something to do with the fact that this "hole" has an entire different effect (and cause) than the polar ozone holes and calling it an ozone hole would lead to confusion about the two. The reason that OH is missing in this region is because it forms in the troposphere by chemical reactions with ozone. The effect of the OH "hole", as I said, is a reduced "cleaning" effect.
Regarding the climate change aspect of water vapor in the stratosphere, I don't see what it has to do with the topic or why you seem to relate this discovery to jet transport.
Tried and tested a thousand times over, the ozone probes he sent up into the tropical sky with a research balloon every 400 kilometres reported – nothing. Or to be more accurate: almost nothing. The ozone concentrations in his measurements remained nearly constantly below the detection limit of approximately 10 ppbv in the entire vertical range from the surface of the Earth to an altitude of around 15 kilometres. Normally ozone concentrations in this part of the atmosphere are three to ten times higher.
It could have something to do with the fact that this "hole" has an entire different effect (and cause) than the polar ozone holes and calling it an ozone hole would lead to confusion about the two. The reason that OH is missing in this region is because it forms in the troposphere by chemical reactions with ozone. The effect of the OH "hole", as I said, is a reduced "cleaning" effect.
Ozone neutral. More or less.
There's nothing neutral about jet emissions into the stratosphere.
Is it? Doesn't seem to be affecting the concentration of stratospheric water vapor much.
Water vapor alone, like in the previous link I put up, is getting transported there by enormous amounts compared to 'natural cycles.'
originally posted by: Alchemst7
a reply to: Fylgje
I've always clung to that theory as to waht initiated to hole in the ozone layer. Theres a few other scientists that say the same ..
NZHerald
After some research he discovered the US tested 331 bombs in the atmosphere, six above the US and the rest above the Marshall Islands in the Pacific Ocean with some in the South Atlantic.
Sure. Why listen to the atmospheric scientists who actually discovered it and understand atmospheric chemistry, right?
Looks like this current 'new' hole is sitting right there near the Marshall Islands so that's probably the best theory yet.
Still not clear on what jet transport has to do with the OH hole in the tropical west Pacific though.
Can you provide the mechanism whereby atmospheric nuclear testing would create a dearth of hydroxl which would persist for 55 years?
What do you mean "it lasts" ten days? What happens to it? If jet transport is adding humungous amounts of water vapor to the atmosphere, why are not water vapor levels rising?
Water vapor lifetimes in the stratosphere are also contentious. In the troposphere, it lasts some give or take 10 days. In the stratosphere there is no consensus: several months, several decades, millenia.
I didn't say jet emissions are good for the environment. I said that as far as ozone goes, jet emissions are neutral.
That's because somehow you have come up with the notion that jet emissions are good for the environment or, at the very least, neutral.
Ok. Please show how nuclear testing 55 years ago can cause of dearth of ozone today.
OH? How about a dearth of ozone? That can be shown.
On the contrary. The mechanism is quite well explained.
But researchers have not yet provided any mechanism by which this hole would naturally form and always have been there.
The Antarctic ozone "hole" was first discovered in the 1970's. In 1985 it was discovered that the "hole" was increasing. The chemistry of natural (seasonal) ozone depletion was understood as was the chemistry which human activity caused.
When the ozone holes were discovered not so very long ago they were not claimed as natural and, in fact, set off a whole long list of changes we all needed to make in our behavior in order to get them to heal.
What do you mean "it lasts" ten days? What happens to it? If jet transport is adding humungous amounts of water vapor to the atmosphere, why are not water vapor levels rising?
Stratospheric water vapor concentrations measured at two midlatitude locations in the northern hemisphere show water vapor amounts have increased at a rate of 1–1.5% yr-1 (0.05–0.07 ppmv yr-1) for the past 35 years. At Washington, D.C., measurements were made from 1964–1976, and at Boulder, Colorado, observations began in 1980 and continue to the present. While these two data sets do not comprise a single time series, they individually show increases over their respective measurement periods. At Boulder the trends do not show strong seasonal differences; significant increases are found throughout the year in the altitude range 16–28 km. In winter these trends are significant down to about 13 km.
1. Also called residence. Chemistry . the length of time a substance remains in the adsorbed, suspended, or dissolved state.
2. Physics. the length of time radioactive material, as gas or particles, remains in the atmosphere after detonation of a nuclear device.
It is well documented in the available literature that surfacing lower-stratospheric and mid- to upper-tropospheric weather are responsible for dry air intrusions and descending dry air. Most times, these dry intrusions manifest themselves as clearly visible dark bands in the satellite water vapor imagery, referred to as dry slots. These dry slots usually result in abrupt surface drying and strong, gusty winds often radically influencing wildland fire behavior and hence fire growth.
They are a bit higher than they were in 1980 but they are lower than they were in 2000 and have been steadily so. That's what the chart I posted shows, the chart which also uses that same data from Boulder.
Water vapor levels in the stratosphere are rising.
Then why, with all those jets flying over Colorado, doesn't water vapor just stay there and accumulate? Since it lasts "several months, several decades, millenia" and the stratosphere is "static?"
The stratosphere doesn't experience weather - it is a very static area. Things there don't move around much so there are lasting pockets of things.
Those "dry slots" are transient, not permanent. They move. Take a look at the water vapor imagery your quote mentions.
So a measurement could be continually taken in one of these 'dry slots' which would give an inaccurate result.
I didn't say jet emissions are good for the environment. I said that as far as ozone goes, jet emissions are neutral.
“The stratospheric water vapor feedback effect could be even larger than the 5-10% we found in our study,” said Davis. “Our analysis suggests that the pathways for water vapor to reach the stratosphere are not completely understood, so we view our numbers as a minimum estimate of the effect of this feedback.” - See more at: cires.colorado.edu...
In addition to being a possible climatic forcing, water vapor in the stratosphere can also play a role in regulating the ozone concentration, because H2O is the source material for making odd hydrogen species HOx9 which is known to cause ozone depletion in the stratosphere via some catalytic cycles.
While water in the stratosphere might seem innocuous, the finding made Anderson “profoundly worried,” he recalls. From the decades he had spent studying the depletion of the earth’s ozone layer—the thin gauze of molecules in the stratosphere that blocks most incoming ultraviolet radiation—Anderson knew that water could, through a series of chemical reactions, destroy ozone.
Anderson persisted, and by early 2012 he had demonstrated the connection. Scrutinizing data from the high-altitude flights, he showed that summer thunderstorms were indeed injecting water molecules into the stratosphere. There, sulfate aerosols (from industrial pollutants as well as volcanoes) attract the water molecules like a sponge and, plumped up, provide a bed for chemical reactions that destroy ozone.
Why do you keep talking about something I didn't say. I said that jet emissions contain some compounds which enhance O3 production and some that deplete O3. I said that the net effect is neutral in regard to O3. I said it in direct response to your comment:
Jet emissions of water vapor and carbon dioxide into the stratosphere are not neutral by any stretch.
Since, according to these articles, this filter layer is sooo important for ozone in the stratosphere, why oh why are jet emissions DIRECTLY into the stratosphere never given their proper place?