United States scientists predict future temperature rise 3-7-temperature, scientists-IT information

United Kingdom the 26th issue of the journal nature in a paper called, United States scientists have reconstructed the average global surface temperature over the past 2 million years, this is by far the longest of the Earth's surface reconstruction of climate research. The article, current levels of greenhouse gases in the atmosphere may make the future Earth's temperature to rise 3 degrees to 7 degrees Celsius.

People's awareness and sensitivity of Earth's climate system dynamics, which greatly depends on the reconstruction of past climate. However, before the reconfiguration of the global average surface temperature only for isolated time window, such as the period during the past 20,000 years, across the ice age of continuous refactoring has not.

This time, United States Stanford University researchers kaluolin·xini of marine sediment cores in use comes from 59 over 20,000 sea surface temperature data with 1000 year intervals, reconstructed the average global surface temperature over the past 2 million years. Researchers found that Earth's surface temperature started declining, to about 1.2 million years ago, this cooling trend stalled, that global cooling is not led into the Middle Pleistocene transition period (1.25 million years ago to 700,000 years ago) the only reason, when Earth's climate was from the ice age cycle of about 41,000 years, 100,000 year cycles of change.

Researchers believe that combining the records of carbon dioxide in the atmosphere, the remodeling forecast global average surface temperature will rise by 3 degrees to 7 degrees Celsius, which is stable at the current level of atmospheric carbon dioxide concentration cases came to the conclusion.

美国科学家预估：未来气温将上升3到7摄氏度 - 气温,科学家 - IT资讯

英国《自然》杂志26日发表的一篇论文称，美国科学家重构了过去200万年的全球平均表面温度，这是迄今为止时间跨度最长的地球表面气候重构研究。文章认为，目前的大气层温室气体水平可能使未来地球温度上升3摄氏度到7摄氏度。

人们对于地球气候系统动力学和敏感度的认识，极大地依赖于对过去气候的重构。但是，之前的全球平均表面温度重构仅针对孤立的时间窗口，譬如过去20000年的时间，而跨越冰期的不间断重构一直没有过。

此次，美国斯坦福大学研究人员卡罗林·希尼使用源自59个海洋沉积岩心的逾20000个海洋表面温度数据结果，以1000年为间隔，重构了过去200万年的全球平均表面温度。研究人员发现，地球表面温度一开始逐渐下降，到大约120万年前这种降温趋势停滞，表明全球变冷并非导致进入中更新世过渡期（125万年前到70万年前）的唯一原因，当时地球气候正从4.1万年左右的冰河周期，向10万年左右的周期转变。

研究人员认为，结合大气层二氧化碳的记录，此次重构预估未来全球平均表面温度将上升3摄氏度到7摄氏度，这是在大气层二氧化碳浓度稳定在目前水平情况下得出的结论。