过去30年南极变暖速度是其他地方的3倍

The South Pole has warmed three times faster than the rest of the planet in the last 30 years due to warmer tropical ocean temperatures, new research showed.

新研究表明，由于热带海洋温度升高，南极在过去30年内的变暖速度是地球其他地方的3倍。

Antarctica's temperature varies widely according to season and region, and for years it had been thought that the South Pole had stayed cool even as the continent heated up.

Researchers in New Zealand, Britain and the United States analysed 60 years of weather station data and used computer modelling to show what was causing the accelerated warming.

They found that warmer ocean temperatures in the western Pacific had over the decades lowered atmospheric pressure over the Weddell Sea in the southern Atlantic.

This in turn had increased the flow of warm air directly over the South Pole - warming it by more than 1.83C (about 3.3F) since 1989.

Authors of the research said the natural warming trend was likely boosted by manmade greenhouse gas emissions and could be masking the heating effect of carbon pollution over the South Pole.

The data showed that the South Pole - the most remote spot on Earth - was now warming at a rate of around 0.6C (1.1F) a decade, compared with around 0.2C (0.4F) for the rest of the planet.