I was driving into work this morning and it was a bright sunny day though a lot of fog in front of me.
As I was stopped in traffic I noticed that every place there was a tree over hanging the footpath or road the surface was all wet. The rest of the road was bone dry so I was wondering do trees soak in moisture from the fog and that what was making the ground under the trees wet?
Anyone ever notice this before?
Would it not be that the dew/mist on the open road evaporated in the sunlight quicker than the moisture under the shade...
Not sure. I suppose that is possible but it actually looked like it had been raining under each tree that I passed. The footpath and run looked so dry like it hadn't rained for days.
I just never noticed it before.
Could it be fog drip?
http://www.sciencemag.org/news/2012/12/cloud-forest-trees-drink-fog (http://www.sciencemag.org/news/2012/12/cloud-forest-trees-drink-fog)
I know Cacti 'drink' fog.
The farmers in the Atacama desert put up huge nets to catch the fog which then condenses into their only supply of water. Trees' foliage would catch fog in the same way so on that basis your statement would be correct.
I'd agree. Probably condensation on trees and simple dripping of water down onto ground underneath branches. Roads might be warmer than leaves as well, so any direct condensate evaporates off more quickly.
This is speculative and not thought through completely, could be absolutely wrong!
Jesus h. Its like bellamy v attenborough v prof brian cole in here
;D
Quote from: quit yo jibbajabba on May 25, 2017, 04:51:24 PM
Jesus h. Its like bellamy v attenborough v prof brian cole in here
;D
Cox.
Knew i shouldve fuckin googled :o
Quote from: Owen Brannigan on May 25, 2017, 08:48:19 PM
Quote from: quit yo jibbajabba on May 25, 2017, 04:51:24 PM
Jesus h. Its like bellamy v attenborough v prof brian cole in here
;D
Cox.
Went to see him the other night. Hoor making an absolute fortune. 40 quid a ticket x ~5000 for operating a fancy PowerPoint.
Quote from: Tony Baloney on May 25, 2017, 10:08:20 PM
Quote from: Owen Brannigan on May 25, 2017, 08:48:19 PM
Quote from: quit yo jibbajabba on May 25, 2017, 04:51:24 PM
Jesus h. Its like bellamy v attenborough v prof brian cole in here
;D
Cox.
Went to see him the other night. Hoor making an absolute fortune. 40 quid a ticket x ~5000 for operating a fancy PowerPoint.
Did you not think it was a great lecture on cosmology and discussion on the development of physics away from newton and beyond the thinking by Einstein?
Quote from: J70 on May 25, 2017, 04:19:39 PM
I'd agree. Probably condensation on trees and simple dripping of water down onto ground underneath branches. Roads might be warmer than leaves as well, so any direct condensate evaporates off more quickly.
This is speculative and not thought through completely, could be absolutely wrong!
Think your nearly spot on.
The trees are colder than the ground because they are more exposed to air and have a larger surface area, so they are colder.
The colder a surface is the faster water will collect on it from condensation from moisture in the air, hence the trees will collect more dew.
The large surface area of all the leaves twigs and branches means there is a much larger area on which dew will collect, it will be exponentially more than the area of ground it covers.
The leaves waxy texture also will not absorb the water but force it to run off.
The ground is also exposed to direct sunlight which will evaporate the water more quickly where as the tree shields most of the lower layers.
Very good OmaghJoe. That would seem to explain it very well.
The trees' leaves looked very wet alright but the ground around the tree looked like a desert.
Also the trees are right beside the sea (Dublin bay) and the fog cloud looked about 1/2 mile away but it was very warm.
Quote from: omaghjoe on May 26, 2017, 06:24:55 AM
Quote from: J70 on May 25, 2017, 04:19:39 PM
I'd agree. Probably condensation on trees and simple dripping of water down onto ground underneath branches. Roads might be warmer than leaves as well, so any direct condensate evaporates off more quickly.
This is speculative and not thought through completely, could be absolutely wrong!
Think your nearly spot on.
The trees are colder than the ground because they are more exposed to air and have a larger surface area, so they are colder.
The colder a surface is the faster water will collect on it from condensation from moisture in the air, hence the trees will collect more dew.
The large surface area of all the leaves twigs and branches means there is a much larger area on which dew will collect, it will be exponentially more than the area of ground it covers.
The leaves waxy texture also will not absorb the water but force it to run off.
The ground is also exposed to direct sunlight which will evaporate the water more quickly where as the tree shields most of the lower layers.
A tree has a larger surface areas than the ground?
Quote from: DuffleKing on May 26, 2017, 04:37:33 PM
Quote from: omaghjoe on May 26, 2017, 06:24:55 AM
Quote from: J70 on May 25, 2017, 04:19:39 PM
I'd agree. Probably condensation on trees and simple dripping of water down onto ground underneath branches. Roads might be warmer than leaves as well, so any direct condensate evaporates off more quickly.
This is speculative and not thought through completely, could be absolutely wrong!
Think your nearly spot on.
The trees are colder than the ground because they are more exposed to air and have a larger surface area, so they are colder.
The colder a surface is the faster water will collect on it from condensation from moisture in the air, hence the trees will collect more dew.
The large surface area of all the leaves twigs and branches means there is a much larger area on which dew will collect, it will be exponentially more than the area of ground it covers.
The leaves waxy texture also will not absorb the water but force it to run off.
The ground is also exposed to direct sunlight which will evaporate the water more quickly where as the tree shields most of the lower layers.
A tree has a larger surface areas than the ground?
Per unit of the ground covered, absolutely.
A tree extends upwards and outwards in all directions. It also has a lot of thin components, which, by definition, have a larger relative surface area.
YOU have a much larger surface area than your footprints.
Your lungs have a way, way bigger surface area than your skin.
Quote from: J70 on May 26, 2017, 08:05:50 PM
YOU have a much larger surface area than your footprints.
Your lungs have a way, way bigger surface area than your skin.
Estimates of the total surface area of lungs vary from 50 to 75 square metres (540 to 810 sq ft); roughly the same area as one side of a tennis court.
For the average adult human, the skin has a surface area of between 1.5-2.0 square meters (16.1-21.5 sq ft.).
Quote from: J70 on May 26, 2017, 08:05:50 PM
Quote from: DuffleKing on May 26, 2017, 04:37:33 PM
Quote from: omaghjoe on May 26, 2017, 06:24:55 AM
Quote from: J70 on May 25, 2017, 04:19:39 PM
I'd agree. Probably condensation on trees and simple dripping of water down onto ground underneath branches. Roads might be warmer than leaves as well, so any direct condensate evaporates off more quickly.
This is speculative and not thought through completely, could be absolutely wrong!
Think your nearly spot on.
The trees are colder than the ground because they are more exposed to air and have a larger surface area, so they are colder.
The colder a surface is the faster water will collect on it from condensation from moisture in the air, hence the trees will collect more dew.
The large surface area of all the leaves twigs and branches means there is a much larger area on which dew will collect, it will be exponentially more than the area of ground it covers.
The leaves waxy texture also will not absorb the water but force it to run off.
The ground is also exposed to direct sunlight which will evaporate the water more quickly where as the tree shields most of the lower layers.
A tree has a larger surface areas than the ground?
Per unit of the ground covered, absolutely.
A tree extends upwards and outwards in all directions. It also has a lot of thin components, which, by definition, have a larger relative surface area.
YOU have a much larger surface area than your footprints.
Your lungs have a way, way bigger surface area than your skin.
Precisely, the tree has a larger surface area in contact with the air than the ground does within its footprint onto which the condensed water is dropping.
Tho this has got me thinking a little bit is it actually the fog that is condensing on the tree? After all fog is very fine water droplets suspended in air which have actually already condensed.
I think that the water come dew actually comes directly from the water vapour in the air, so the trees arent drinking the fog but the water vapour, tho could stand corrected on this