(This is part of a private message from Richard S Courtney, answering a third person’s question: “what fundamental principles of thermodynamic, radiative forcing or radiation balance are in conditions to explain the fall of latest global temperatures observed by University of Alabama in Huntsville?”
Published with Richard’s permission)
I look at the records of global temperature and I see a series of cycles that are overlayed on each other. For example,
1. There seems to be an apparent ~900 year oscillation that caused the Roman Warm Period (RWP), then the Dark Age Cool Period (DACP), then the Medieval Warm Period (MWP), then the Little Ice Age (LIA), and the present warm period (PWP).
2. There seems to be an apparent ~60 year oscillation that caused cooling to ~1910, then warming to ~1940, then cooling to ~1970, then warming to ~2000, then cooling since.
So, has the warming from the LIA stopped or not? That cannot be known because the pattern of past global temperature fluctuations suggests that the existing cooling phase of the ~60 year cycle is opposing any such warming. And that cooling phase can be anticipated to end around 2030 when it can be anticipated that then either
(a) warming from the LIA will continue until we reach temperatures similar to those of the MWP
(b) cooling will set in until we reach temperatures similar to those of the LIA.
But this begs the question as to why such global temperature fluctuations occur. And I address that issue as follows.
The basic assumption used in the climate models is that change to climate is driven by change to radiative forcing. And it is very important to recognise that this assumption has not been demonstrated to be correct. Indeed, it is quite possible that there is no force or process causing climate to vary. I explain this as follows.
The climate system is seeking an equilibrium that it never achieves. The Earth obtains radiant energy from the Sun and radiates that energy back to space. The energy input to the system (from the Sun) may be constant (although some doubt that), but the rotation of the Earth and its orbit around the Sun ensure that the energy input/output is never in perfect equilbrium.
The climate system is an intermediary in the process of returning (most of) the energy to space (some energy is radiated from the Earth’s surface back to space). And the Northern and Southern hemispheres have different coverage by oceans. Therefore, as the year progresses the modulation of the energy input/output of the system varies. Hence, the system is always seeking equilibrium but never achieves it.
Such a varying system could be expected to exhibit oscillatory behaviour. And, importantly, the length of the oscillations could be harmonic effects which, therefore, have periodicity of several years. Of course, such harmonic oscillation would be a process that – at least in principle – is capable of evaluation.
However, there may be no process because the climate is a chaotic system. Therefore, observed oscillations such as ENSO, NAO, PDO and etc. could be observation of the system seeking its chaotic attractor(s) in response to its seeking equilibrium in a changing situation.
Very importantly, there is an apparent ~900 year oscillation that caused the Roman Warm Period (RWP), then the Dark Age Cool Period (DACP), then the Medieval Warm Period (MWP), then the Little Ice Age (LIA), and the present warm period (PWP). As I suggest above, all the observed rise of global temperature in the twentieth century could be recovery from the LIA that is similar to the recovery from the DACP to the MWP. And the ~900 year oscillation could be the chaotic climate system seeking its attractor(s). If so, then all global climate models and ‘attribution studies’ utilized by IPCC and CCSP are based on the false premise that there is a force or process causing climate to change when no such force or process exists.
But the assumption that climate change is driven by radiative forcing may be correct. If so, then it should be noted that it is still extremely improbable that – within the foreseeable future – the climate models could be developed to a state whereby they could provide reliable predictions. This is because the climate system is extremely complex. Indeed, the climate system is more complex than the human brain (the climate system has more interacting components – e.g. biological organisms – than the human brain has interacting components – e.g. neurones), and nobody claims to be able to construct a reliable predictive model of the human brain. It is pure hubris to assume that the climate models are sufficient emulations for them to be used as reliable predictors of future climate when they have no demonstrated forecasting skill.
So, my bottom line answer to a question that asks, “what fundamental principles of thermodynamic, radiative forcing or radiation balance are in conditions to explain the fall of latest global temperatures observed by University of Alabama in Huntsville ?” is
I don’t know because nobody can know, but I want to know.
And that is why I support attempts to quantify all the “fundamental principles” which you mention because that attempt affords the possibility of telling me what I want to know.