Record melt: Greenland lost 586 billion tonnes of ice in 2019
Nuuk: Greenland lost a record amount of ice during an extra warm 2019, with the melt massive enough to cover California in more than four feet of water, a new study said.
After two years when summer ice melt had been minimal, last summer shattered all records with 586 billion tons (532 billion metric tons) of ice melting, according to satellite measurements reported in a study Thursday.
That's more than 140 trillion gallons (532 trillion litres) of water.
That's far more than the yearly average loss of 259 billion tons (235 billion metric tons) since 2003 and easily surpasses the old record of 511 billion tons (464 billion metric tons) in 2012, said a study in Nature Communications Earth & Environment. The study showed that in the 20th century, there were many years when Greenland gained ice.
Not only is the Greenland ice sheet melting, but it's melting at a faster and faster pace, said study lead author Ingo Sasgen, a geoscientist at the Alfred Wegener Institute in Germany.
Last year's Greenland melt added 0.06 inches (1.5 millimeters) to global sea level rise.
That sounds like a tiny amount but in our world it's huge, that's astounding, said study co-author Alex Gardner, a NASA ice scientist. Add in more water from melting in other ice sheets and glaciers, along with an ocean that expands as it warms - and that translates into slowly rising sea levels, coastal flooding and other problems, he said.
While general ice melt records in Greenland go back to 1948, scientists since 2003 have had precise records on how much ice melts because NASA satellites measure the gravity of the ice sheets. That's the equivalent of putting the ice on a scale and weighing it as water flows off, Gardner said.
As massive as the melt was last year, the two years before were only on average about 108 billion tons (98 billion metric tons). That shows that there's a second factor called Greenland blocking, that either super-charges that or dampens climate-related melting, Gardner said.
In the summer, there are generally two factors in Greenland's weather, Gardner said. Last year, Greenland blocking - a high pressure over Canada that changes the northern jet stream - caused warm southern air to come up from the United States and Canada and flow into Greenland, forcing more melting.
In 2017 and 2018 without Greenland blocking, cooler Arctic air flowed from open ocean into Greenland, making summer milder, he said.
This year, Greenland's summer melt has been not as severe, closer to normal for recent times, said Ruth Mottram, an ice scientist at the Danish Meteorological Institute, who wasn't part of Sasgen's research.
Mottram and several other outside scientists said Sasgen's calculations make sense. In her own study this month in the International Journal of Climatology, she found similar results and also calculated that Greenland coastal regions have warmed on average 3 degrees (1.7 degrees Celsius) in the summer since 1991.
The fact that 2019 set an all-time record is very concerning, said New York University ice scientist David Holland, who wasn't part of either study.
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Prasidh, Kuldeep limit South Africa to 270 after De Kock's hundred
Visakhapatnam (PTI): India fought back gallantly through Prasidh Krishna and Kuldeep Yadav after Quinton de Kock struck his 23rd hundred, keeping South Africa to a manageable 270 in the third and series-deciding final ODI, here Saturday.
India won the toss after judging the spin of the coin incorrectly 20 times in a row. They had little hesitation in inserting the Proteas into bat, a clear indication of dew factor dominating the thought.
After Arshdeep Singh sent back Ryan Rickelton early, De Kock (106, 89b, 8x4, 6x4) struck his seventh century against India and put on 113 runs off 124 balls with skipper Temba Bavuma (48, 67b) as the visitors moved to a healthy position.
De Kock was severe on Prasidh (4/66), who erred on length continuously in his first spell (2-0-27-0). The left-hander biffed the pacer for 6, 6, 4 in his second over to milk 18 runs.
The 32-year-old quickly pounced on anything that was short, and pacers Prasidh and Harshit offered him plenty of feed on his pet areas.
Bavuma was more sedate, and made runs through those typical dabs and jabs, occasionally unfurling a drive of elan.
De Kock moved to fifty in 42 balls, and never let the tempo down reaching his hundred in 79 balls.
India found temporary relief when Ravindra Jadeja induced a false slash from Bavuma to get caught by Virat Kohli at point.
The tourists got another move on through a 54-run partnership between De Kock and Matthew Breetzkle for the third wicket, and at 168 for two in 28 overs they were in a good position to press on.
But Breetzke's punishment of part-time spinner Tilak Varma forced a rethink in the Indian camp, as skipper KL Rahul brought back Prasidh for a second spell.
What a masterstroke it turned out to be! The Karnataka man broke the back of South Africa’s top and middle order in an exceptional second spell (4-0-11-3).
Breetzke was the first man to go, trapped plumb in front with a straight one and four balls later Aiden Markram uppishly chipped a fuller delivery to Kohli at short covers.
Prasidh soon castled De Kock, whose ugly cross-batted swipe failed to connect a full length delivery from the pacer.
All of a sudden, SA found themselves at a shaky 199 for five, losing three wickets in the space of three overs.
Once Prasidh was done away with the top and middle-order, left-arm wrist spinner Kuldeep (4/41) took over and mopped up the tail as SA fell short of even a par total on this track.
