WebHubTelescope | August 19, 2012 at 10:24 am |
“Way I look at it, CO2 doesn’t have much effect upon temperature.”
Well, the way you look at something doesn’t have any effect on the actual situation.
…..
“But to get to your misconception, CO2 actually has a significant effect on temperature. If it wasn’t for the non-condensing GHGs such as CO2, the earth would be frozen over, with a high reflecting albedo as the ice accumulates. Once CO2 is available to heat through the GHE then the condensing H20 will kick in by outgassing and contribute to raising the average temperature by around 33C.”
Webbie gives example illustrating:
“It *seems* to me that the warmers tend believe CO2 has considerably more warming than I think it does, and I don’t see anywhere in science papers that much warming is assigned to CO2.”
To rephrase, webbie seems to think the CO2 is necessary to cause water to melt on earth.
Our tropics are about 26 C average temperature- currently.
But a block of ice on the Moon or Mars, and it will evaporate- which saying nothing because ice will evaporate at -150 C. So on Moon the block of ice evaporate fairly rapidly until this evaporation cool the block ice down to -150 C. Of course in sunlight it isn’t going to cool to -150 C. Kinda explains why the Moon is so dry. Mars is also kinda dry- and though it’s thin atmosphere allow liquid water to be somewhat stable just above it’s freezing point- the block of ice or bucket of cold water will evaporate, as long as it’s above -150 C.
The point one should getting is earth as long as it’s high temperature, or average temperature is above -150 C, and has plenty of water, it will have water vapor in it’s atmosphere. Maybe not a lot water vapor, at least some.
Now, Mars is pretty cold place, but has surface temperature in daylight reaching as around 80 F. If one had solar pond or greenhouse on Mars one could close to having liquid water from passive heating. If just liquid water during daytime [and froze at nite] that require pretty simple greenhouse or solar pond- all you mainly need to do prevent heat loss from evaporation. No has found nor is likely the find small lake of water on Mars- this because Mars is so dry. A natural lake over even short period [decades] will evaporate. Though if had enough water on Mars you would have bodies of waters, which would at least melt on the surface in some daylight conditions.
Now if had Mars at earth distance, the surface will warm much hotter than 80 F- probably around 212 F. And of course it’s average temperature will much higher than it’s current average temperature of
“Average temperature: ~210 K (-63 C)”
http://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html
Of course Mars has massive amount CO2 in it’s atmosphere as compared how much CO2 Earth has in it atmosphere. But addition, if Mars average temperature were to increase, CO2 would no longer freeze out it’s poles. So, as wild guess you double it’s current the amount CO2 in it’s atmosphere. But another major element which would occur is Mars dry frozen soil would evaporate more water into the atmosphere- so might add 10 or 100 times more water vapor than Mars currently has.
So Mars at Earth’s orbit could have about 50 times more CO2 than Earth and could have around 1/2 amount water vapor which is Earth’s atmosphere. Though put water on Mars it could has much water vapor as Earth has.
Let’s look at webbie’s reference:
http://www.reportingclimatescience.com/this-issue/atmosphere-and-surface/gavin-schmidt-takes-the-measure-of-the-greenhouse-effect.html
“If, for instance, CO2 concentrations are doubled, then the absorption would increase by 4 W/m2, but once the water vapor and clouds react, the absorption increases by almost 20 W/m2 ”
So he counting the water vapor and clouds to get the 20 W/m2- otherwise it’s 4 W/m2- a small amount.