On August 23rd, 2016 Roy Spencer wrote an article in which he states that observational evidence gathered at Desert Rock, Nevada, affirms the existence of a radiative “greenhouse effect”. In that article he makes several assertions that I would like to address.
Let’s start with his definition of the “greenhouse effect” from the article, “the ‘greenhouse effect’ is usually expressed [as] the increase in surface temperatures caused by greenhouse gases compared to if those gases did not exist.” Just to be clear, the “increase in surface temperatures caused by greenhouse gases” according to the “greenhouse effect” hypothesis are overall average temperatures seen within a location, a region or the entire globe over time—the course of an entire day, an entire year, an entire decade or an entire Century. They are not just the nighttime temperatures that Spencer was studying and commenting on. As such his data is too limited to properly evaluate the existence or non-existence of a radiative “greenhouse effect” even as he has defined it.