Permanent El Niño-Like Conditions During the Pliocene Warm Period
Permanent El Niño-Like Conditions During the Pliocene Warm Period
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DOI：
10.1126/science.1112596
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发表时间：
2005-07
期刊：
影响因子：
56.9
通讯作者：
M. Wara;A. Ravelo;M. Delaney
中科院分区：
文献类型：
--
作者：
M. Wara;A. Ravelo;M. Delaney
在温暖的上新世早期（约450万至300万年前），气候比今天更温暖的最近一次间隔，东太平洋温跃层很深，赤道太平洋的平均西向东海面温差仅为1.5±0.9°C，与现代El Niño事件非常相似。因此，横跨赤道太平洋的现代强海表温度梯度并不是一个稳定和永久的特征。持续的厄尔尼诺Niño-like条件，包括相对较弱的纬向大气（沃克）环流，可能是全球变暖的结果，并在决定全球变暖方面发挥重要作用。
During the warm early Pliocene (∼4.5 to 3.0 million years ago), the most recent interval with a climate warmer than today, the eastern Pacific thermocline was deep and the average west-to-east sea surface temperature difference across the equatorial Pacific was only 1.5 ± 0.9°C, much like it is during a modern El Niño event. Thus, the modern strong sea surface temperature gradient across the equatorial Pacific is not a stable and permanent feature. Sustained El Niño-like conditions, including relatively weak zonal atmospheric (Walker) circulation, could be a consequence of, and play an important role in determining, global warmth.