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| -Signs, Portents, and the Weather- |
| Now it's the global warming WATER VAPOR danger!! (NASA - sigh) |
| 2009-12-16 |
| Posted by:3dc |
| #5 Another important issue is that people don't understand how greenhouses gasses work. They assume that if the average temperature is 4 degrees higher, for example, that daytime temperatures would be higher. Untrue. Greenhouse gasses increase the average by increasing the low temperature. They actually act to decrease the daytime high. You will never see temperatures in a very humid area as high as they are in Death Valley. That is because most of the sun's energy is in the infrared. Increasing greenhouse gasses also acts to block solar heat radiation, they absorb some, and only re-radiate a portion of that back toward Earth. An night is where GHG's have their greatest impact. They absorb heat radiated from the surface and night and re-radiate a portion back to the surface. The real impact of GHGs is to increase the nighttime low temperature while also moderating daytime high temperature. It reduces the diurnal (day/night) swing in temperature. That isn't likely to hurt anyone. |
| Posted by: crosspatch 2009-12-16 22:35 |
| #4 Water vapor is also a massive heat pump upwards - evaporation at ground level then condensation high in the atmosphere. Where heat can more easily escape to space. |
| Posted by: phil_b 2009-12-16 21:06 |
| #3 All the computer models and dire predictions regarding CO2 also assumed positive feedback.. With all the tricks they've been using you could show warming (or cooling) based on table salt, Internet porn or anything else. |
| Posted by: Iblis 2009-12-16 20:32 |
| #2 That damn dihydrogen minoxide is a menace! |
| Posted by: Cornsilk Blondie 2009-12-16 19:02 |
| #1 The study only assumes that water vapor, as it is a much more potent greenhouse gas, is a positive feedback. What it neglects to take into account is clouds ... which reflect radiation back into space and generally cause cooling. When you have more water vapor in the air, you have more clouds. They don't take clouds into consideration, only the water vapor. FAIL |
| Posted by: crosspatch 2009-12-16 18:53 |