Conventional AGW greenhouse theory assumes, however, that the primary greenhouse gas water vapor is instead controlled by man-made CO2, which allegedly amplifies [via "positive feedback"] the greenhouse effect of CO2 by a factor of 3-5 times. This new paper torpedoes that theory by demonstrating that the natural adiabatic lapse rate [which is dependent only upon atmospheric mass, gravity, and atmospheric heat capacity at constant pressure, and is completely independent of CO2 levels] instead controls the relative humidity/water vapor content of air masses as they rise/expand/cool/dry and then fall/compress/warm in an infinite cycle due to the gravity field.
Catastrophic global warming theory is additionally torpedoed by overwhelming observational evidence that water vapor feedback is negative, not positive, and therefore counteracts any warming effect of CO2 via a self-regulating homeostatic mechanism. The wet adiabatic lapse rate is only one-half the dry adiabatic lapse rate, proving that water vapor acts as a negative-feedback cooling agent, not as a positive-feedback warming agent.
Processes controlling water vapor in the upper troposphere / lowermost stratosphere: An analysis of eight years of monthly measurements by the IAGOS-CARIBIC observatory
A. Zahn et al
An extensive set of in situ water vapor (H2O) data obtained by the IAGOS-CARIBIC passenger aircraft at 10–12 km altitude over eight years (2005 – 2013) is analyzed. A multifaceted description of the vertical distribution of H2O from the upper troposphere (UT) via the extra-tropical tropopause mixing layer (exTL) into the lowermost stratosphere (LMS) is given. Compared to longer-lived trace gases, H2O is highly variable in the UT and exTL. It undergoes considerable seasonal variation, with maxima in summer and in phase from the UT up to ~4 km above the tropopause. The transport and dehydration pathways of air starting at the Earth's surface and ending at 10–12 km altitude are reconstructed based upon (i) potential temperature (θ), (ii) relative humidity with respect to ice (RHi), and (iii) back trajectories as a function of altitude relative to the tropopause. RHi [relative humidity with respect to ice] of an air mass was found to be primarily determined by its temperature change during recent vertical movement, i.e. cooling during ascent/expansion and warming during descent/compression. The data show with great clarity that H2O and RHi at 10–12 km altitude are controlled by three dominant transport/dehydration pathways: (i) the Hadley circulation, i.e. convective uplift in the tropics and pole-ward directed subsidence drying from the tropical tropopause layer (TTL) with observed RHi down to 2%, (ii) warm conveyor belts and mid-latitude convection transporting moist air into the UT with observed RHi usually above 60%, and (iii) the Brewer-Dobson shallow and deep branches with observed RHi down to 1%.