According to a guy named Ka-Kit Tung, we have seen less land surface warming than expected in the last 15 years because the heat has gone into the oceans instead. He thinks the trend of land surface warming will eventually resume. Is he worried about some sudden reversal where the heat trapped in the ocean would suddenly be released? No.
Nobody knows how long the current pause will last. Nonetheless, at some point, the natural cycles will shift; the oceans will cease to absorb the bulk of the planet’s warming; and surface temperatures will begin to climb again. When they do, we can expect the increase to resume the rapid pace observed during the late twentieth century, when surface temperature rose by about 0.17 degrees Celsius every ten years.
In the meantime, whether the overall risk to our environment has been reduced by the pause remains an open question. Some argue that what went down will eventually come back up. The sloshing back and forth of warm and cold waters – El Niño and La Niña – in the shallow layer of the equatorial Pacific Ocean will continue to produce fluctuations in surface temperatures every year. Over longer periods, however, the risk that the heat currently stored in the deep ocean will resurface is remote.
Who is this guy? He is “a fellow of the American Meteorological Society, is Professor of Applied Mathematics and an adjunct professor of Atmospheric Sciences at the University of Washington.”
If we are saying some end of year thank yous, I would just like to say, thank you, ocean, for keeping our planet habitable for another year.