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Spurred by a warming climate, daily【C1】______high temperatures occurred twice as often as record lows over the last decade acros
Spurred by a warming climate, daily【C1】______high temperatures occurred twice as often as record lows over the last decade acros
admin
2022-08-09
39
问题
Spurred by a warming climate, daily【C1】______high temperatures occurred twice as often as record lows over the last decade across the continental United States, new research shows.
The【C2】______of record highs to lows is likely to increase dramatically in coming decades if emissions of greenhouse【C3】______continue to climb. "Climate change is making itself【C4】______in terms of day-to-day weather in the United States," says NCAR scientist Gerald Meehl, the【C5】______author. "The ways these records are being broken show how our climate is already【C6】______."
The study, by authors at many well-known research institutes, has been【C7】______for publication in Geophysical Research Letters. It was【C8】_______by the National Science Foundation, the Department of Energy, and Climate Central.
If temperatures were not warming, the number of record daily highs and lows being【C9】______each year would be approximately even. Instead, for the period from【C10】______, to September 30, 2009, the continental United States set 291,237 record highs and【C11】______record lows, as the country experienced unusually mild winter weather and intense summer【C12】______.
A record daily high means that temperatures were warmer on a【C13】______day than on that same date throughout a weather station’s history. The authors used a quality control process to ensure the reliability of data from thousands of weather stations across the country, while looking at data over the past six【C14】______to capture longer-term trends.
This decade’s wanning was more【C15】______in the western United States, where the ratio was more than【C16】______, than in the eastern United States, where the ratio was about one-and-a-half to one.
The study also found that the two-to-one ratio across the country as a whole could be【C17】______more to a comparatively small number of record lows than to a large number of record highs. This【C18】______that much of the nation’s warming is occurring at night, when temperatures are【C19】______less often to record lows. This finding is consistent with years of climate【C20】______research showing that higher overnight lows should be expected with climate change.
【C11】
Spurred by a warming climate, daily record high temperatures occurred twice as often as record lows over the last decade across the continental United States, new research shows. The ratio of record highs to lows is likely to increase dramatically in coming decades if emissions of greenhouse gases continue to climb. "Climate change is making itself felt in terms of day-to-day weather in the United States," says NCAR scientist Gerald Meehl, the lead author. "The ways these records are being broken show how our climate is already shifting."
The study, by authors at many well-known research institutes, has been accepted for publication in Geophysical Research Letters. It was funded by the National Science Foundation, the Department of Energy, and Climate Central.
If temperatures were not warming, the number of record daily highs and lows being set each year would be approximately even. Instead, for the period from January 1, 2000, to September 30, 2009, the continental United States set 291,237 record highs and 142,420 record lows, as the country experienced unusually mild winter weather and intense summer heatwaves.
A record daily high means that temperatures were warmer on a given day than on that same date throughout a weather station’s history. The authors used a quality control process to ensure the reliability of data from thousands of weather stations across the country, while looking at data over the past six decades to capture longer-term trends.
This decade’s warming was more pronounced in the western United States, where the ratio was more than two to one, than in the eastern United States, where the ratio was about one-and-a-half to one.
The study also found that the two-to-one ratio across the country as a whole could be attributed more to a comparatively small number of record lows than to a large number of record highs. This indicates that much of the nation’s warming is occurring at night, when temperatures are dipping less often to record lows. This finding is consistent with years of climate model research showing that higher overnight lows should be expected with climate change.
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142,420
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