Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr
Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr
复制标题
过去700 kyr西北热带太平洋温跃层动态
DOI：
10.1016/j.quascirev.2020.106465
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发表时间：
2020-09
影响因子：
4
通讯作者：
Bingbin Qin
中科院分区：
文献类型：
--
作者：
Qi Jia;Tiegang Li;Zhifang Xiong;Stephan Steinke;Thomas J. Algeo;Fuqing Jiang;Fengming Chang;Bingbin Qin
斜温条件的变化在西太平洋暖池的形成和连接热带与热带外太平洋的过程中起着重要的作用。然而，长期的温斜变化在西北部的WPWP和他们的强迫机制还没有得到很好的理解，特别是在轨道时间尺度。在这项研究中，我们报告了在过去的700 kyr在菲律宾海西部的站点MD 06 -3047 B的温度变化。我们的数据表明，温跃层的温度和盐度在研究区域的变化与地球的盐度的变化，与温暖和咸（冷和新鲜）温跃层沃茨对应的高（低）地球轴向盐度。在高盐度下，温跃层温度和盐度的增加可能与北太平洋热带暖水的平流有关。在研究区域，在上层水柱较低（较高）的垂直温度梯度表明在冰川（间冰期）的温跃层较深（浅）。导致冰川期温跃层加深的主要因素是东亚冬季风（EAWM）的加强，更多的拉尼娜现象可能有助于同时发生的次表层变暖，从而导致温跃层加深。在冰川期，在北方和近赤道南部WPWP的同相温斜加深可能是由冰川边界条件的变化，如冰盖厚度增加，通过加强EAWM和加强热带信风。
Variations in thermoclinal conditions play an important role in the evolution of the Western Pacific Warm Pool (WPWP) and in connecting the tropical and extratropical regions of the Pacific Ocean. However, secular thermoclinal changes in the northwestern part of the WPWP and their forcing mechanisms are not yet well understood, particularly on orbital timescales. In this study, we report thermoclinal variation at Site MD06-3047 B in the western Philippine Sea over the last 700 kyr. Our data show that variations in thermocline temperature and salinity in the study area were correlated with changes in Earth’s obliquity, with warmer and saltier (colder and fresher) thermocline waters corresponding to high (low) Earth-axial obliquity. At high obliquity, increases in thermocline temperature and salinity may have been linked to advection of warm North Pacific tropical water. In the study area, a lower (higher) vertical temperature gradient in the upper water column suggests a deeper (shallower) thermocline during glacials (interglacials). The main factor leading to thermoclinal deepening during glacials was strengthening of the East Asian winter monsoon (EAWM), and more La Niña-like conditions may have contributed to concurrent subsurface warming and thus thermoclinal deepening. In-phase thermoclinal deepening in the northern and peri-equatorial southern WPWP during glacial stages may have been triggered by changes in glacial boundary conditions, such as increased ice sheet thickness, through intensification of the EAWM and strengthening of the tropical Trade Winds.
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DOI：
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发表时间：
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期刊：
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影响因子：
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