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Mountain versus Valley Temps Stretch Apart with Climate Change

環(huán)境保護也要著眼本地

If you've ever driven up to a mountain pass, you know that the higher you climb, the colder it gets. But on clear, calm days, it can actually be colder in the valleys. That's because under high-pressure systems, cold air slides down mountain slopes and pools down below. In the Oregon Cascades, ridgeline temperatures have clocked in at 27 degrees Fahrenheit warmer than those in a valley 2,600 feet below.

如果你曾經(jīng)開車爬過山路，就會知道爬得越高氣溫越低。但實際上，在晴朗寧靜的日子里，山谷中的溫度更低。那是因為在高壓系統(tǒng)下，冷空氣沿山坡下降，并于地勢低處聚集。俄勒岡州的喀斯喀特山脈，其山谷比山脊低2600英尺，而所記錄的溫度顯示，山谷比山脊的溫度低了華氏27度。

So what happens when you take this variability and subject it to climate change? Well, a moderate estimate from the IPCC says western Oregon could warm 5 degrees Fahrenheit over the next century. But that's probably more accurate for the valleys - ridgetop temperatures could rise as much as 14 degrees Fahrenheit, according to research in the International Journal of Climatology.

因此，當你明白了這種溫差，而它又遭遇了氣候變化的時候，會怎樣呢？聯(lián)合國政府間氣候變化專門委員會對此作出適當推測，他們認為，到下個世紀，俄勒岡州西部的溫度會升高華氏5度。不過，根據(jù)《國際氣候?qū)W雜志》上發(fā)表的研究，這一數(shù)據(jù)對于山谷可能更精確，因為脊頂?shù)臏囟瓤赡軙呷A氏14度。

Oregon is projected to have more high-pressure days as the climate changes. That means more cold air pooling in the valleys and more extreme temperature differences, which could disrupt the local ecosystem.

隨著氣候變化，俄勒岡州將會有更多的高壓天氣。這意味著更多的冷空氣會聚集在山谷，并導致更為極端的溫度差異，從而破壞當?shù)氐纳鷳B(tài)系統(tǒng)。

We tend to think of climate change as a global or regional phenomenon. But, as this research suggests, you have to also think locally.

我們常常認為氣候變化是全球性或區(qū)域性現(xiàn)象，但這項研究表明，氣候變化的重大影響會給你帶來切身體會。環(huán)境保護，不僅要“全球著眼，本地入手”（Environmental protection, think worldly, act locally.），同時也要“著眼本地”（ also think locally）。

—Christopher Intagliata

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