2017 2nd-hottest year on record midway through; surprise given El Nino role in 2016 record tempsLeave a Comment
At the halfway point of the year, 2017 remains the second-hottest year to date — a surprise given the demise of the El Niño that helped boost temperatures to record levels last year.
The continued near-record warmth is a marker of just how much global temperatures have risen thanks to the greenhouse gases accumulating in the atmosphere from fossil fuel use….
NOAA released its global temperature data for June on Tuesday, and ranked June as the third warmest in its records. The four-warmest Junes in its records have all happened in the past four years. (NASA, which released its June numbers on Friday, ranked June as the fourth hottest. The two agencies handle the data slightly differently, which can lead to small differences in their rankings, though they strongly agree on recent warming.)
The hotspots around the world for June included central Asia and western and central Europe. A searing heat wave in western Europe that helped fuel deadly wildfires in Portugal was made up to 10 times more likely because of Earth’s rising temperature, according to a recent study done in partnership with Climate Central….
..The Paris Climate agreement, which President Trump has pledged to pull the U.S. out of, set a goal of limiting warming to under 2°C (3.6°F) above pre-industrial levels by the end of this century (and to aim for an even more ambitious 1.5°C (2.7°F)). To make the global temperatures more relevant to that measure, Climate Central re-analyzed the numbers by averaging together NASA and NOAA’s data and comparing them to the average for 1881-1910. June 2017 was 1.81°F (1.01°C) above that average, showing how little wiggle room is left to keep temperatures under that level…
…Wherever its final rank ends up, 2017 will almost certainly be hot enough to knock 1998 — the only remaining 20th century year among the top 10 warmest — down another spot, to No. 9 in NOAA’s rankings.
At the time, 1998’s heat was exceptional, and was fueled in part by a major El Niño, which tends to raise global temperatures. But as Earth’s temperature has steadily risen because of heat-trapping greenhouse gases, an El Niño isn’t necessary to reach those heights anymore.
In fact, years with La Niñas (which tend to cool global temperatures) are today warmer than El Niño years several decades ago. 2017 actually started out with a La Niña, albeit a weak one, but it is 0.38°F (0.21°C) ahead of 1998, Sanchez-Lugo, said.,,,