飛機常常在空中留下一道白色的,由冰晶構成的尾雲。一份新的研究指出,凝結雲正在加熱地球。然而,不同的飛行器有不同的尾雲,從47公噸的空中巴士A319到508公噸的空中巴士A380(上圖中的兩架噴射客機)。藉由分析剛形成不到十分鐘的凝結尾雲,科學家發現,「新鮮」的尾雲會吸收大量的熱紅外線(infrared radiation),使得地球些微的增溫。根據2005的航空量,如果尾雲的效應能推估至全世界,則每平方公尺,持續吸收15.9毫瓦的能量;大約是二氧化碳自工業革命以來,吸收熱能的1%。
資料來源:ScienceShot: Contrails Warm the Globe [27 June 2011]
相關文章:PanSci:噴射機尾雲是暖化的大兇手
View Comments
之前看全球黯化的紀錄片是說機尾雲最後會讓全球冷化....
原理是...因為雲把陽光遮住?
http://en.wikipedia.org/wiki/Global_dimming 根據wiki的資料
"Clouds intercept both heat from the sun and heat radiated from the
Earth. Their effects are complex and vary in time, location, and
altitude. Usually during the daytime the interception of sunlight
predominates, giving a cooling effect; however, at night the
re-radiation of heat to the Earth slows the Earth's heat loss."
「雲(應該包括尾雲)會攔截來自太陽以及地球發散出的熱」......但人類活動釋出的熱,散不出去,應該影響比較大。
裡面也提到:
"Some climate scientists have theorized that aircraft contrails
(also called vapor trails) are implicated in global dimming, but the
constant flow of air traffic previously meant that this could not be
tested."
所以這篇研究應該就是在回答這假設。