美國高溫記錄明顯超過低溫記錄
文章來源:未知 文章作者:meng 發布時間:2009-11-13 00:23 字體: [ ]  進入論壇
(單詞翻譯:雙擊或拖選)

Spurred by a warming climate, daily record high temperatures occurred twice as often as record lows over the last decade across the continental1 United States, new research shows. The ratio(比,比率) of record highs to lows is likely to increase dramatically in coming decades if emissions2 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 NCAR, Climate Central, The Weather Channel, and the National Oceanic and Atmospheric3 Administration (NOAA), has been accepted for publication in Geophysical Research Letters. It was funded by the National Science Foundation, NCAR's sponsor, 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(近似地,大約) 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 heat waves.

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 reliability4 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(歸于,屬于) 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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1 continental Zazyk     
adj.大陸的,大陸性的,歐洲大陸的
參考例句:
  • A continental climate is different from an insular one.大陸性氣候不同于島嶼氣候。
  • The most ancient parts of the continental crust are 4000 million years old.大陸地殼最古老的部分有40億年歷史。
2 emissions 1a87f8769eb755734e056efecb5e2da9     
排放物( emission的名詞復數 ); 散發物(尤指氣體)
參考例句:
  • Most scientists accept that climate change is linked to carbon emissions. 大多數科學家都相信氣候變化與排放的含碳氣體有關。
  • Dangerous emissions radiate from plutonium. 危險的輻射物從钚放散出來。
3 atmospheric 6eayR     
adj.大氣的,空氣的;大氣層的;大氣所引起的
參考例句:
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面溫度與大氣環流是密切相關的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通過大氣窗區向地表輻射能量。
4 reliability QVexf     
n.可靠性,確實性
參考例句:
  • We mustn't presume too much upon the reliability of such sources.我們不應過分指望這類消息來源的可靠性。
  • I can assure you of the reliability of the information.我向你保證這消息可靠。
TAG標簽: climate temperature ratio
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