Dynamical changes in the tropical Pacific warm pool and zonal SST gradient during the Pleistocene
Dynamical changes in the tropical Pacific warm pool and zonal SST gradient during the Pleistocene
复制标题
DOI：
10.1002/2014gl061639
复制
发表时间：
2014-11-16
影响因子：
5.2
通讯作者：
Ravelo, A. Christina
中科院分区：
文献类型：
--
作者：
Dyez, Kelsey A.;Ravelo, A. Christina
在晚更新世，大气二氧化碳浓度（pCO（2））被认为是热带海面温度（SST）变化的主要驱动力，因为热带太平洋SST的冰期-间冰期变化与pCO（2）共变。然而，如果 pCO(2) 的区域辐射效应是唯一的变化因素，那么热带海温梯度应该保持相似，因为 pCO(2) 随时间变化。相反，来自西太平洋的海温新记录表明，热带海温梯度与过去不同，甚至相反，这表明动态环流变化发挥着重要作用。具体而言，除了当地的 pCO(2) 强迫之外，上升源水温度的变化也影响了热带太平洋海表温度。这些动力变化，而不是pCO(2)，可能改变了热带地区的背景状态，甚至帮助为中更新世过渡奠定了基础。
In the late Pleistocene, the atmospheric carbon dioxide concentration (pCO(2)) is thought to be a primary driving force for tropical sea surface temperature (SST) change because glacial-interglacial changes in tropical Pacific SST covary with pCO(2). However, if the regional radiative effects of pCO(2) were the only agent of change, tropical SST gradients should have remained similar as pCO(2) varied with time. Instead, a new record of SST from the west Pacific shows that tropical SST gradients were different, even reversed, in the past, suggesting an important role for dynamical circulation changes. Specifically, changes in the temperature of upwelled source water, in addition to local pCO(2) forcing, influenced tropical Pacific SST. These dynamical changes, rather than pCO(2), may have shifted the background state of the tropics and even helped set the stage for the mid-Pleistocene transition.