Pacific warm pool subsurface heat sequestration modulated Walker circulation and ENSO activity during the Holocene.
Pacific warm pool subsurface heat sequestration modulated Walker circulation and ENSO activity during the Holocene.
复制标题
全新世期间太平洋暖池地下热封存调节沃克环流和 ENSO 活动
DOI：
10.1126/sciadv.abc0402
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发表时间：
2020-10
期刊：
影响因子：
13.6
通讯作者：
Kuhnt W
中科院分区：
文献类型：
--
作者：
Dang H;Jian Z;Wang Y;Mohtadi M;Rosenthal Y;Ye L;Bassinot F;Kuhnt W
在过去的25000年里，轨道驱动的暖池上层水温调节着赤道太平洋的气候变化。在年际以上的时间尺度上驱动厄尔尼诺Niño-Southern涛动（ENSO）的动力学知之甚少。本文收集了近25000年来印度-太平洋暖池的温跃层温度记录，发现全新世早期有一次大变暖，全新世中期有一次二次变暖。第一次温跃层增温与6月（南方冬季）最大日照驱动的南太平洋浅层翻转环流热输运有关。第二次温跃层变暖发生在赤道9月的最大日照之后，这可能导致赤道太平洋西-东的上层海洋热梯度变陡，Walker环流增强。温池温跃层变暖最终降低了全新世早期至中期ENSO的年际活动。因此，大幅度增加的暖池海洋热含量，在过去充当ENSO的负反馈，可能在持续的全球变暖中发挥作用。
Orbitally driven warm pool upper-water temperature regulates the equatorial Pacific climate change over the past 25,000 years. Dynamics driving the El Niño–Southern Oscillation (ENSO) over longer-than-interannual time scales are poorly understood. Here, we compile thermocline temperature records of the Indo-Pacific warm pool over the past 25,000 years, which reveal a major warming in the Early Holocene and a secondary warming in the Middle Holocene. We suggest that the first thermocline warming corresponds to heat transport of southern Pacific shallow overturning circulation driven by June (austral winter) insolation maximum. The second thermocline warming follows equatorial September insolation maximum, which may have caused a steeper west-east upper-ocean thermal gradient and an intensified Walker circulation in the equatorial Pacific. We propose that the warm pool thermocline warming ultimately reduced the interannual ENSO activity in the Early to Middle Holocene. Thus, a substantially increased oceanic heat content of the warm pool, acting as a negative feedback for ENSO in the past, may play its role in the ongoing global warming.
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