Here’s another study that discusses the hiatus and reasons for it, which I like better, bec it takes a more holistic approach, including the longer and deeper solar minimum:
“Natural variability, radiative forcing and climate response in the recent hiatus reconciled,”
Markus Huber & Reto Knutti, Nature Geoscience 7, 651–656 (2014)
nature.com/ngeo/journal/v7/n9/full/ngeo2228.html
and an article about it:
reportingclimatescience.com/news-stories/article/study-natural-variations-and-solar-irradiance-cause-pause.html
Global warming is currently taking a break: whereas global temperatures rose drastically into the late 1990s, the global average temperature has risen only slightly since 1998 – surprising, considering scientific climate models predicted considerable warming due to rising greenhouse gas emissions…
Researchers have been looking into the possible causes of the warming hiatus over the past few years. For the first time, Reto Knutti, Professor of Climate Physics at ETH Zurich, has systematically examined all current hypotheses together with a colleague.
El Nino warmed the Earth [but] …La Nina has made the past few years cooler than they would otherwise have been. Although climate models generally take such fluctuations into account, it is impossible to predict the year in which these phenomena will emerge…
Longer solar cycles - … solar irradiance has been weaker than predicted in the past few years. This is because the identified fluctuations in the intensity of solar irradiance are unusual at present: whereas the so-called sunspot cycles each lasted eleven years in the past, for unknown reasons the last period of weak solar irradiance lasted 13 years. Furthermore, several volcanic eruptions, such as Eyjafjallajökull in Iceland in 2010, have increased the concentration of floating particles (aerosol) in the atmosphere, which has further weakened the solar irradiance arriving at the Earth’s surface.
Incomplete measured data - The discrepancy between the climate models and measured data over the past 16 years cannot solely be attributed to the fact that these models predict too much warming, says Knutti. The interpretation of the official measured data should also be critically scrutinised. According to Knutti, measured data is likely to be too low, since the global average temperature is only estimated using values obtained from weather stations on the ground, and these do not exist everywhere on Earth. From satellite data, for example, scientists know that the Arctic region in particular has become warmer over the past years, but because there are no weather stations in that area, there are measurements that show strong upward fluctuations. As a result, the specified average temperature is too low…