Klimaforskning - hjemmeside
Startet av Gloføken, november 05, 2011, 14:31:56 PM
Sitat fra: Jostemikk på april 05, 2012, 20:27:51 PMNå tillot Tallbloke Postma å slippe til på The Talkshop - Joseph E. Postma: Copernicus Meets the Greenhouse Effect. Dette er meget viktig og riktig gjort av Tallbloke. Postma er bannlyst hos WUWT, og bloggen han skriver på har havnet i samme idiotkategori som The Talkshop, noe jeg begynner å tro er et kvalitetstegn.
SitatGerhard Kramm on February 15, 2012 at 7:43 pm Dear Dr. Pierrehumbert,recently, Hansen et al. (2011) stated:Sitat»The basic physics underlying this global warming, the greenhouse effect, is simple. An increase of gases such as CO2 makes the atmosphere more opaque at infrared wavelengths. This added opacity causes the planet's heat radiation to space to arise from higher, colder levels in the atmosphere, thus reducing emission of heat energy to space. The temporary imbalance between the energy absorbed from the Sun and heat emission to space, causes the planet to warm until planetary energy balance is restored.«A similar argument can be find in the paper of Ramanathan et al. (1987); Jim Hansen was one of the co-authors. First of all, this argument is incorrect because neither the globally averaged fluxes of sensible and latent heat nor the globally averaged net radiation in the infrared range, DL_u (i.e., terrestrial radiation minus down-welling radiation) are functions of the surface temperature. Second, there is no constant ratio between W = H + E on the one hand and DL_u on the other hand. ). A reduction of DL-u by F = 0.58 W/m^2, as diagnosed by Hansen et al. (2011) may easily be compensated by H and/or E to fulfill the energy flux budget for the Earth's surface. The same is true in case of any other of these flux terms. Note that even the Bowen ratio = H/E is not constant.Sincerely yoursGerhard Kramm
Sitat»The basic physics underlying this global warming, the greenhouse effect, is simple. An increase of gases such as CO2 makes the atmosphere more opaque at infrared wavelengths. This added opacity causes the planet's heat radiation to space to arise from higher, colder levels in the atmosphere, thus reducing emission of heat energy to space. The temporary imbalance between the energy absorbed from the Sun and heat emission to space, causes the planet to warm until planetary energy balance is restored.«
SitatGerhard Kramm says: November 29, 2011 at 2:56 pm The so-called climate feedback equation that is based on the global energy balance model of Schneider and Mass (1975) reads (e.g., Manabe & Stouffer, 2007):R dT_s/dt = Q – lambda T_s Herein, R is the thermal inertia coefficient, T_s is the global surface temperature, Q is the radiative forcing, t is time, and lambda is the feedback parameter. The reciprocal of lambda is the so-called climate sensitivity parameter. The steady-state solutions of this equation for the disturbed case (Q + RF, where RF is the net radiative forcing) and the undisturbed case (Q) will provideDelta T_S = RF/lambdaif Q, lambda, and RF are considered as constant with time. Sometimes the climate sensitivity is defined with respect to a doubling of the atmospheric carbon dioxide concentration.Unfortunately, the climate feedback equation has to be discarded because of physical reasons. These reasons are two-fold. First, this equation suggest a planetary radiative equilibrium for the earth's surface in case of its steady state solution, but this kind of radiative equilibrium does not exist for the real earth-atmosphere system. There is, if at all, only a global energy balance for the earth's surface that also contains the fluxes of sensible and latent heat, and the sum of these two fluxes is much larger than the net infrared radiation flux (e.g., Trenberth et al., 2009). Second, the globally averaged surface temperature cannot be related to a global energy balance because none of these governing fluxes (solar radiation, net infrared radiation, sensible and latent heat) can be related to this mean global surface temperature. From a physical point of view, this global surface temperature is a bloodless quantity. It plays only a role in Schellnhuber's two-Kelvin-goal and in different definitions of the atmospheric greenhouse effect.