The Greenhouse Net Cooling Effect!

The term ‘Radiative Forcing’ that was first defined in IPCC reports is non-measurable as it changes with altitude (temperature), due to moist adiabatic lapse rate the latent heat absorbed rises to a cooler upper atmosphere and latent heat is released on precipitation that cools and cleans the atmosphere and surfaces again.

Since the original definition of ‘Radiative Forcing’ in IPCC Second Assessment the concept has evolved include the cooling effects of aerosols.
IPCC Third Assessment Report (2001) “Since the Second Assessment Report, significant progress has been achieved in better characterizing the direct radiative roles of different types of aerosols. Direct radiative forcing is estimated to be –0.4Wm–2, for sulfate –0.2Wm, –2 for biomass burning aerosols, –0.1 W m–2 for fossil fuel organic carbon and +0.2 W m–2 for fossil fuel black carbon aerosols. There is much less confidence in the ability to quantify the total aerosol direct effect and its evolution over time, than that for the gases listed above. Aerosols also vary considerably by region and respond quickly to changes in emissions.”
IPCC Fourth Assessment Report (2007) “Anthropogenic contributions to aerosols (primarily sulphate, organic carbon, black carbon, nitrate, and dust) together produce a cooling effect, with a total direct radiative forcing of –0.5 [–0.9 to –0.1] W m–2 and an indirect cloud albedo forcing of –0.7
[–1.8 to –0.3] W m–2. These forcings are now better understood than at the time of the TAR due to improved in situ, satellite and ground-based measurements and more comprehensive modeling, but remain the dominant uncertainty in radiative forcing. Aerosols also influence cloud lifetime and precipitation.”
Dry cloudless deserts with little greenhouse effect get hotter than humid, cloudy places that which precipitate more often. There is more incoming solar radiation heating surfaces in the desert and high-pressure system warm fronts adiabatically heating the air. In humid conditions, however, increased cloud cover and precipitation are associated with low-pressure systems that adiabatic cools air temperatures. Cloud cover and precipitation have negative forcing on surfaces.
The hydrological cycle shows solar radiation heats surfaces creating evaporation and humidity that becomes cloud cover and latent heat is released on precipitation.
With reference to the Atmospheric Transmission Chart below, H20 has the highest Specific Heat Capacity and absorbs most of the UP-GOING 15–30% IR THERMAL RADIATION. Humidity just makes it feel hotter delaying the escape of latent heat however the cooler atmosphere does no work on the warmer surfaces and no change in internal energy of warmer surfaces by the cooler atmosphere. As you can see due to Specific Heat Capacities, CO2 and CH4 absorb less heat than H20 and are also in parts per million ie. Average CO2 0.04% of air and parts per billion i.e., Average CH4 0.0002% of air respectively.
Source: Wiki-commons.
The NASA Earth Energy Budget Flowchart below confers with the Atmospheric Transmission Chart. The surfaces are heated in the first instant by INCOMING SOLAR RADIATION that heats the air near the surfaces and adiabatically heating the air further through high-pressure system warm fronts raising air temperatures. There is no apparent ‘forcing’ by the greenhouse gases on the surfaces in the flowchart below. CO2 is transparent, there are adiabatic lapse rates, and even if it did “mirror” or “reflect” up-going IR heat back to the surfaces, whether it be light or heat, it is less the original solar radiation heating the surfaces. For example, if you touch sand during the day it is hotter than the air near the surface.
Due to Specific Heat Capacities between ocean and air, warm water creates warm wind high-pressure systems that raise global air temperature and similarly cool water creates low-pressure systems and cold fronts that lower global air temperature. The incoming solar radiation heats surfaces in the first instant. There is also atmospheric adiabatic heating from the rise and expansion of heated air mass near surfaces and from Foehn winds down hills.
The reason I suspect GHG’s are a net thermal sink is by comparing air temperatures in a dry cloudless desert near the Equatorial where the sun is most direct and intense to air temperatures in a Tropical rainforest or rice farming agricultural land near the Equatorial where most ‘greenhouse effect’ exists and the GHG’s and cloud cover definitely keep it from getting too hot in the day and too cold at night, precipitation then cools and cleans the air and surfaces. In Cambodia, for example, the driest time of the year between Jun-Aug is the hottest and the cloud cover still builds up every day blocking the solar radiation heating surfaces and precipitates every several days cooling the surfaces again. Compare this to a dry cloudless desert region such as Death Valley that is in a rain shadow, the incoming solar radiation heating surfaces and heat island effects heating air near surfaces plus adiabatic heating high-pressure systems makes air temperatures hotter in the desert than if there were cloud cover. Foehn winds downhill and convection superheat the air in the desert valley as it has steep hillsides either side. In Australia, the hottest places are in arid regions in the interior characteristic of dry weather and clear skies.
These studies confirm the negative forcing of clouds.
“The IPCC 2007 report [4] shows that this cooling effect may be large enough to offset 50% of the radiative heating due to the build up of greenhouse gases. This indirect effect is acknowledged to be the largest source of uncertainty in understanding the human impact on the global climate.”
“Cloud radiative forcing (CRF) is defined as the difference between the radiation budget (net incoming solar radiation minus the out- going long wave) over a cloudy (mix of clear and clouds) sky and that over a clear sky. If this difference is negative clouds exert a cooling effect, while if it is positive, it denotes a heating effect. The five-year average of the cloud radiative forcing [5] is shown in Fig. 2. The global average forcing is about –15 to –20 W m-2 and thus clouds have a major cooling effect on the planet. Two major puzzles posed by this data are germane to the topic of this paper.”
I prepared this diagram to help demonstrate the Greenhouse Cooling Effect.
In conclusion, humidity just makes it appear hotter increasing the heat index, not air temperatures. The deserts are hotter due to lack of greenhouse gases, cloud cover, precipitation and low-pressure systems helping regulate temperatures than it is where it is humid, cloudy and precipitates more. High-pressure system warm fronts are generally associated with dry weather and clear skies whereas low- pressure systems cold fronts are associated with cloud cover and precipitation. Air temperatures are more to do with solar radiation heating surfaces and air mass. Submarine volcanoes are also another potential heat source of the oceans where most warming has occurred. The ‘greenhouse effect’ is an important part of a healthy biosphere, water vapor and CO2 is plant food and the CH4 is an indication of biological degradation and drawing up of worms that which improves the soils. The greenhouse gases are just thermal regulators that mimic temperatures and change with temperature, they do not drive temperature, however, they do help prevent the air getting too hot in the day and too cold at night.