A millennial-scale U37K′ sea-surface temperature record from the South China Sea (8°N) over the last 150 kyr: Monsoon and sea-level influence
A millennial-scale U37K′ sea-surface temperature record from the South China Sea (8°N) over the last 150 kyr: Monsoon and sea-level influence
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DOI：
10.1016/j.palaeo.2005.11.033
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发表时间：
2006-06
期刊：
影响因子：
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通讯作者：
Meixun Zhao;Chi‐Yue Huang;Chia-Chun Wang;G. Wei
中科院分区：
文献类型：
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作者：
Meixun Zhao;Chi‐Yue Huang;Chia-Chun Wang;G. Wei
利用MD 972151钻孔记录了西太平洋暖池（WPWP）北方边缘南海南部150 kyr的U37 K ′海表温度（SST）和碳酸盐含量，采样分辨率为150-200 a.冰/间冰期SST变化在第二阶段约为5 °C（23.5至28.5 °C），在第一阶段约为4 °C（24至28 °C）。终端I期间海平面和U37 K ′SST的同时上升表明，海平面变化通过影响热带海洋暖表层水通过巽他陆架区（底床深度30-50 m）与南海的交换，对南海SST的变化起着重要作用。当海平面相对于今天下降不到30米时，MD 972151 SST持续高于27 °C，这种情况发生在MIS 5e，MIS 5c和5a的一部分以及过去11 kyr。海平面变化也是控制南海碳酸盐含量的主要因素;由于陆源输入的稀释作用，低海平面时碳酸盐含量较低。在我们的年龄模型的限制下，在整个冰期期间，千年尺度的SST振荡（几百年内1.5 °C）频繁发生，与中国东部的葫芦季风记录和北方半球高纬度地区的Dansgaard-Oeschger（D-O）循环记录有相当好的相关性。这种相关性表明，高纬度大气强迫和低纬度气候振荡之间的遥相关在西太平洋热带地区通过亚洲季风系统。碳酸盐含量也揭示了千年尺度的振荡在冰期，较高的含量与较高的SST。南海低纬区SST和碳酸盐含量的千年尺度波动为高频率的气候变化是全球现象提供了额外的证据。
We report 150 kyr records of U37K′sea-surface temperature (SST) and carbonate content with 150–200-year sampling resolution from the southern South China Sea (SCS) in the northern margin of the Western Pacific Warm Pool (WPWP) using IMAGES Core MD972151. The glacial/interglacial SST change is about 5 °C for Termination II (23.5 to 28.5 °C) and 4 °C for Termination I (24 to 28 °C). The simultaneous rise of sea level and U37K′SST during Termination I suggests that sea-level change has played an important role in the SCS SST variability by influencing the exchange of tropical ocean warm surface water with the SCS through the Sunda Shelf region (sill depth 30–50 m). When sea-level drop was less than 30 m relative to today's, MD972151 SST was constantly above 27 °C, a situation which occurred during MIS 5e, part of MIS5c and 5a, and over the last 11 kyr. Sea-level change was also the main control on carbonate content in the SCS; this was lower during low sea-level stands due to the dilution effect of enhanced terrigenous inputs. Within the limitations of our age model, millennial-scale SST oscillations (1.5 °C over a few hundred years) occurred frequently during the entire glacial period, correlating reasonably well with the Hulu monsoon record from eastern China and the Dansgaard-Oeschger (D-O) cycles recorded for high-latitude regions in the Northern Hemisphere. Such correlations suggest a possible teleconnection between higher latitude atmospheric forcing and low-latitude climate oscillations in the western Pacific tropical region via the Asian monsoon system. Carbonate content also reveals millennial-scale oscillations during the glacial period, with higher content correlated with higher SST. Millennial-scale fluctuations of SST and carbonate contents at this low-latitude SCS provide additional evidence that high-frequency climate changes are global phenomena.