TO: FCT and anyone else that want to throw in their two cents:
[4] is, of course, Akasofu, S.-I. On the present halting of global warming. Climate 2013, 1, 411.
If you think Nuccitelli, Abraham, Benestad and Mandia's paper is confused and disjointed, perhaps you missed the disclaimer that read: "While there are a number of errors in [4], here, only the most critical ones will be addressed, for sake of brevity. There is not particular ordering of importance; each of these errors is significant on its own".
Akasofu claims that we are experiencing a linear warming trend which he characterizes as a "recovery" from the LIA, without identifying or even suggesting a cause.
Do you believe the temperature increases seen in the 20th century are part of a linear warming recovery from the LIA?
Akasofu claims that global heating has stopped. It is a common claim around here. Nuccitelli provide 11 reference studies using direct satellite measurement of the ToA imbalance, ocean temperatures, combined land and ocean temperatures, sea level increases and so forth, that all show the Earth's total heat content is still increasing. He goes on to state that they know of none that show heating to have stopped.
Do you know of a study that shows the Earth's heating to have stopped? The claim has been made here dozens of time by dozens of posters. From what study does that come?
Akasofu made use of proxy data to construct his two century record. He did not discuss the accuracy or resolution of his proxies nor did he discuss how he blended the proxy data into the instrumented data. Sound familiar?
Akasofu plotted his data (1800-2000) and then simply stated "all these results clearly shown near linear increases in temperature". He provided no mathematics; no statistics. Nuccitelli et al plot a quadratic curve through the data with a demonstrably superior fit (lower residuals). Do you think Akasofu's unsupported claim is acceptable?
Akasofu ignores the effects of solar variability, orbital changes, volcanoes, natural greenhouse gases, anthropogenic greenhouse gases, land use changes and aeosol production on the Earth's climate during the period under discussion. Do you think that's acceptable?
You have correctly noted on multiple occasions that the relationship between CO2 concentration and its radiative forcing factor is not linear. Yet Akasofu claims that a linear increase in temperature in the face of a quadratic increase in atmopsheric CO2 is "problematic". Do you believe it is problematic?
Nuccitelli et al conclude, saying
"It is reasonable, as the author (Akasofu) suggests, to consider that the Earth;s temperature variations have a natural component related to multi-decadal ocean oscillations. It is also true that recent atmospheric temperature measurements have significantly slowed their increase compared to previous years. Exploration of the role of the PDO in moderating temperature increases and in distributing heat more efficiently to deep ocean zones is a useful and important endeavor. However, the method carried out in [4] makes errors of such gravity that the central conclusions cannot hold".
Do you have a disagreement with anything they say there?