January 2016 was hottest such month on record
Global warming in overdrive: We just had the hottest January ever recorded
ClimateCentral.org, Feb. 17, 2016
Global warming went into overdrive in January, leading to astounding temperature records.
January was the globe's most unusually warm month ever recorded, and the past three months have been the most unusually warm three-month period on record as well, according to new findings from NASA.
January was also the warmest such month on record, NASA found, in preliminary data released this weekend by the Goddard Institute for Space Studies (GISS) in New York.
The data, which is subject to adjustment as scientists refine their analysis, shows that the combination of accelerated manmade global warming from the burning of fossil fuels, such as coal and oil, is combining with a record strong El Niño to bump up temperatures to never-before-seen levels since at least 1880.
According to NASA, the global average surface temperature during January was 1.13 degrees Celsius, or 2.3 degrees Fahrenheit above average, compared to the 1951 to 1980 average.
This makes it the first month to exceed 2 degrees Fahrenheit above average. December's global average temperature came in just under this, at 1.11 degrees Celsius above average, which translates to nearly 2 degrees Fahrenheit above normal.
The previous record warm January in NASA's records was January of 2007, when global average temperatures were 0.95 degrees Celsius, or 1.71 degrees Fahrenheit, above average. That year, like 2015, was also an El Niño year.
The period from November through January was the warmest three month period on record, NASA data shows, with an average global temperature of 1.1 degrees Celsius, or 1.95 degrees Fahrenheit, compared to the 20th century average.
Much of the unusual warmth through the winter so far has been observed across Siberia, much of the Arctic, parts of Central Asia as well as Canada and Alaska.
In the Arctic, above average air temperatures have helped to keep sea ice to record low levels, and a record low sea ice maximum may be set in March.
Arctic sea ice extent for the month of January hit a record low.
The monthly average sea ice extent for January was 42,500 square miles below the previous record low in 2011, and about 405,000 square miles below the 1979-2000 average.
For perspective, that departure from average is equivalent to missing a region of ice the size of the states of Texas, New Mexico, Maryland and New Hampshire combined.
Japan shows similar trends but different record years
NASA isn't the only agency showing record warmth in January, although the baseline years used to determine temperature anomalies do affect the anomalies and rankings, along with other factors.
The Japan Meteorological Agency (JMA), which is another agency that keeps tabs on global average surface temperatures, also found that January 2016 was the warmest such month on record.
However, the JMA data shows that January had a slightly lower departure from average compared to December 2015, with the monthly global average temperature anomaly of 0.52 degrees Celsius above the 1981 to 2010 average. This was 0.91 degrees Celsius, or 1.6 degrees Fahrenheit, above the 20th century average.
This was the warmest January since 1891, the JMA found.
According to the JMA, December had a temperature departure from the 20th century average of 1.04 degrees Celsius, or 1.9 degrees Fahrenheit, and November was 0.88 degrees Celsius, or 1.6 degrees Fahrenheit, above the 20th century average.
The National Oceanic and Atmospheric Administration (NOAA), which is the other U.S. agency that tracks global temperatures, is expected to release its global January data within the next week.
It is likely to find that it was the warmest January on record, but whether it ranks it as mild as NASA did is unclear.
El Niño plus manmade warming
No matter what NOAA's rankings turn out to be, though, it's already clear that January, as well as this winter so far, stand out as the most unusually mild period on record since instrument records began in the late 19th century — and very likely long before that.
The El Niño event in the equatorial tropical Pacific Ocean is playing a role in boosting global temperatures, since the presence of unusually mild waters across such a vast and strategic expanse of the Pacific acts as a heat pump, effectively transferring back into the atmosphere some of the excess energy that has built up in the oceans due to global warming and natural processes.
Lest one pin all the blame on El Niño, though, it's noteworthy that no past El Niño year — not even years with El Niño events as strong as this one (the only comparable event occurred in 1997-98) — have come close to the temperature anomalies seen during the past several months.
Simply put, it's easier to set warm temperature records now than it used to be, particularly when manmade forces line up with natural climate variability like El Niño.
Deke Arndt, the director of climate monitoring at NOAA's National Centers for Environmental Information in Asheville, North Carolina, has offered a useful analogy that helps explain the relationship between manmade climate change and El Niño.
Long-term warming is like riding an escalator up over time - it moves you consistently to higher values. El Niño is like jumping up during that trip. You reach new heights when the long-term effects are combined with the short-term jumps," Arndt said in an email to Mashable.
"These two factors — long-term warming and El Niño — have worked together to give us this recent run of unprecedented warm months," he wrote.
According to Arndt, each intense El Niño adds about 0.5-degree Fahrenheit to the global temperature during the course of the event, which is less than the 1-degree Fahrenheit of global warming since the early 1980s.
"Where you are on the escalator matters! The decades-long ride on the escalator has moved us significantly further from where we started than any individual El Niño," he wrote.
"But the strong El Niño jump in recent months has helped us separate from even the small pack of previously-warmest-on-record months."
In fact, the lingering influence of El Niño may mean that 2016 will also set an all-time annual temperature record, since the atmospheric effects of El Niño tend to be delayed by several months when compared to the oceanic impacts.