New Ice Core Analysis Shows Sharp Increase in Greenland Warming
2023-01-25
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1A recently released study says the average yearly temperature on Greenland has increased by 1.5 degree Celsius above the average for the 20th century for a 15-year period ending in 2011.
2Scientists used examples of Greenland's ice to get information about temperatures from hundreds of years in the past.
3Until recently, Greenland's ice cores had not shown a clear sign of warming on the remotest north-central part of the island.
4Those findings were based on cores from 1995.
5Researchers involved in the recent study examined cores that were drilled in 2011.
6They said their work showed a rise in temperature in the previous 15 years.
7The German researchers published their study in Nature.
8Maria Hoerhold, the study's lead writer, said this a clear signal of climate change.
9"We keep on (seeing) rising temperatures between 1990s and 2011," she said.
10Hoerhold is a glaciologist at the Alfred Wegener Institute in Germany.
11"We have now a clear signature of global warming."
12Scientists take years to study ice core data.
13Hoerhold has new cores from 2019.
14But she has not finished studying them.
15She expects the temperature rise to continue.
16The study said Greenland's ice sheet and glaciers have been melting.
17Information from ice cores has been used to estimate temperatures in Greenland from the year 1000 to 2011.
18Scientific models suggest average temperatures fell a little for the first 800 years of that period.
19Temperatures then increase a little and then go down until a sudden increase from the 1990s until 2011.
20The increase in temperatures after 1995 was much larger than pre-industrial times before the mid-19th century.
21There is an "almost zero" chance that it is anything but human-caused climate change, Hoerhold said.
22Hoerhold said Greenland's natural weather changes in the past had hidden human-caused climate change.
23But, as of about 25 years ago, the warming became too big to be hidden, she said.
24Scientists say past data shows that Greenland is not warming as fast as the rest of the Arctic, the extreme northern part of the world.
25Some scientists suggest the temperature of the Arctic is now increasing at a rate four times faster than the average world temperature is.
26Hoerhold and scientists not involved in the research said the new warming data is bad because Greenland's ice is melting.
27The study ends with data from 2011.
28Hoerhold said that, in the following year, a lot of ice melted across Greenland, and the island's ice loss has been high since then.
29Jason Box is a scientist with the Danish Meteorological Institute.
30He said, "We should be very concerned about North Greenland warming because that region has a dozen sleeping giants in the form of wide tidewater glaciers and an ice stream."
31As temperatures continue to get warmer, more ice will melt in Greenland, he said.
32Twila Moon is a scientist with the U.S. National Snow and Ice Data Center.
33Melting glaciers in Greenland means "rising seas that threaten homes, businesses, economies and communities," she said.
34I'm Dan Novak.
1A recently released study says the average yearly temperature on Greenland has increased by 1.5 degree Celsius above the average for the 20th century for a 15-year period ending in 2011. 2Scientists used examples of Greenland's ice to get information about temperatures from hundreds of years in the past. Until recently, Greenland's ice cores had not shown a clear sign of warming on the remotest north-central part of the island. Those findings were based on cores from 1995. Researchers involved in the recent study examined cores that were drilled in 2011. They said their work showed a rise in temperature in the previous 15 years. The German researchers published their study in Nature. 3Maria Hoerhold, the study's lead writer, said this a clear signal of climate change. 4"We keep on (seeing) rising temperatures between 1990s and 2011," she said. Hoerhold is a glaciologist at the Alfred Wegener Institute in Germany. "We have now a clear signature of global warming." 5Scientists take years to study ice core data. Hoerhold has new cores from 2019. But she has not finished studying them. She expects the temperature rise to continue. The study said Greenland's ice sheet and glaciers have been melting. 6Information from ice cores has been used to estimate temperatures in Greenland from the year 1000 to 2011. Scientific models suggest average temperatures fell a little for the first 800 years of that period. Temperatures then increase a little and then go down until a sudden increase from the 1990s until 2011. 7The increase in temperatures after 1995 was much larger than pre-industrial times before the mid-19th century. There is an "almost zero" chance that it is anything but human-caused climate change, Hoerhold said. 8Hoerhold said Greenland's natural weather changes in the past had hidden human-caused climate change. But, as of about 25 years ago, the warming became too big to be hidden, she said. 9Scientists say past data shows that Greenland is not warming as fast as the rest of the Arctic, the extreme northern part of the world. Some scientists suggest the temperature of the Arctic is now increasing at a rate four times faster than the average world temperature is. 10Hoerhold and scientists not involved in the research said the new warming data is bad because Greenland's ice is melting. The study ends with data from 2011. Hoerhold said that, in the following year, a lot of ice melted across Greenland, and the island's ice loss has been high since then. 11Jason Box is a scientist with the Danish Meteorological Institute. He said, "We should be very concerned about North Greenland warming because that region has a dozen sleeping giants in the form of wide tidewater glaciers and an ice stream." As temperatures continue to get warmer, more ice will melt in Greenland, he said. 12Twila Moon is a scientist with the U.S. National Snow and Ice Data Center. Melting glaciers in Greenland means "rising seas that threaten homes, businesses, economies and communities," she said. 13I'm Dan Novak. 14Dan Novak adapted this story for VOA Learning English based on reporting by The Associated Press. 15_____________________________________________________________________ 16Words in This Story 17century -n. a period of 100 years 18core -n. a long piece that is taken out of a material for study, often to examine its chemical properties in relation to age 19remote - n. far away from people, houses or forms of civilization 20signature - adj. something closely linked to someone or something 21glacier - n. a huge area of ice that moves slowly down a hill or mountain 22region - n. an area of a country or the world that is different from others in some way 23sleeping giant - n. something or someone with great strength or power that has not yet been realized