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Jacquelyn Gill on rapid climate change 13,000 years ago

EarthSky

Jacquelyn Gill: Understanding the past is often the key to understanding the future.

杰奎琳·吉爾：了解過去通常是預(yù)知未來的關(guān)鍵。


You’re listening to Jacquelyn Gill,PhD candidate at the University of Wisconsin-Madison. She’s been researching a period of rapid cooling that occurred about 13,000 years ago. Gill said that global temperatures took an extreme and sudden dip, just as the world was coming out of an ice age. Gill spoke with EarthSky at a science meeting in late 2009.

您剛才聽到的是來自威斯康辛大學(xué)麥迪遜分校的博士生杰奎琳·吉爾的講話。吉爾研究了13000年前地球氣溫急速下降的一段時(shí)期。她在2009年末一次科學(xué)大會(huì)上接受采訪時(shí)告訴我們，冰河世紀(jì)末期全球氣溫經(jīng)歷了一次驟降。


Jacquelyn Gill: It’s important because it’s one of our best-dated and most studied examples of rapid climate change.

杰奎琳·吉爾：這段時(shí)期非常重要，因?yàn)樗刭|(zhì)年代精確，為科學(xué)家研究氣候突變提供了寶貴資料。


Gill has been studying animals that lived around that time, using fungal spores preserved in sediment as an indicator of the presence of wildlife. She’s found that extinctions of big ice age animals – creatures like mastodons – happened about 1,000 years before this brief cooling period.

吉爾通過研究地質(zhì)沉降物中保存下來的真菌孢子，來分析這段時(shí)期前后動(dòng)物的生存狀況。她發(fā)現(xiàn)距離氣溫驟降約1000年前，乳齒象等冰川期大型動(dòng)物開始滅絕。


Jacquelyn Gill: Immediately following the decline in these animal populations, the first wildfires pop up on the landscape. We also see widespread vegetation change. So it really seems like the landscape is noticing the loss of these herbivores.

杰奎琳·吉爾：動(dòng)物大量死亡后不久地球上開始出現(xiàn)森林大火。緊接著地表植被發(fā)生改變，仿佛感覺到了食草動(dòng)物的消失。


She said that scientists still aren’t sure why animals of the ice age died off, or why the world’s climate might suddenly warm and cool. But, she added, mining the past for clues about rapid climate change could help us better understand how the environment stands to be affected by today’s global warming.

吉爾表示，目前科學(xué)家還無法確定冰河時(shí)期動(dòng)物滅絕的原因、以及為什么全球氣候會(huì)發(fā)生驟變。但她同時(shí)指出，從歷史中尋求線索將有助于人們更好地理解現(xiàn)在全球變暖對(duì)環(huán)境造成的影響。

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