李文宝^1,2,,
王汝建²
1. 内蒙古农业大学水资源保护与利用自治区重点实验室, 内蒙古 呼和浩特 010018
2. 同济大学海洋地质国家重点实验室, 上海 200092

基金项目: 国家自然科学基金项目（批准号：41406056）和内蒙古自治区自然科学基金项目（批准号：2016MS0552）共同资助


详细信息

作者简介: 李文宝, 男, 38岁, 博士, 第四纪地质学、古海洋与古气候学等研究, E-mail:tianshitd@126.com

中图分类号: P736.2;P532

收稿日期:2018-04-13
修回日期:2018-07-20
刊出日期:2018-09-30

Change of sea surface temperature and responding to climate change around the Southern Ocean during the last 800 ka

Li Wenbao^1,2,,
Wang Rujian²
1. IMAR Key Laboratory of Water Resources Protection and Utilization, Inner Mongolia Agricultural University, Hohhot, 010018, Inner Mongolia
2. State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092


MSC: P736.2;P532

--> Received Date: 13 April 2018
Revised Date: 20 July 2018
Publish Date: 30 September 2018


摘要
摘要:南大洋地理位置关键，其海水热量变化往往会对区域或全球气候产生影响。通过对比南大西洋和南太平洋等南大洋关键海域近800 ka以来的海水表层温度（Sea Surface Temperature，简称SST）变化，同时结合南极冰芯记录的大气CO₂浓度、大气温度及大洋底栖氧同位素等气候演变替代指标，对南大洋区域经向海表热量差异及气候响应进行分析，结果显示：1）南大洋不同海域近800 ka以来SST的演化具有明显的区域性。如相较于其他冰期，南大西洋ODP1090站SST值在MIS 12~10期的最低值出现约3.8℃的上升，南塔斯曼海ODP1170站SST冰期最低值则出现约1.3℃的下降；而西南印度洋的MD962077站SST冰期最低值在MIS 10期之后出现约2.2℃的上升。此外，滤波分析结果显示3个站位对"中更新世气候转型"（Mid-Pleistocene Transition，简称MPT）等全球性事件均响应明显；2）"中布容事件"（Mid-Brunhes Event，简称MBE）的发生对南大洋经向温度差异（ΔSST_1090-1170）影响明显：MBE之前，ODP1090站位SST在冰期-间冰期旋回中的平均值或极值均比ODP1170站SST的平均值或极值低，但MBE发生期间及之后的MIS 5、MIS 2、MIS 1期，ODP1090站SST的平均值或极值均比ODP1170站SST的平均值或极值高。同时，南大洋经向SST差异（ΔSST_1090-1170）在间冰期对气候变化的响应明显比冰期显著。显然，气候变化条件下的海洋锋面迁移及Agulhas流阶段性增强导致外部向南大西洋输入热量有所增加，最终使ΔSST_1090-1170值偏正。因此，冰期-间冰期旋回中气候环境改变导致的海洋锋面移动幅度差异等是影响环南极海域经向温度差异变化的关键因素之一。
关键词: SST/
气候变化/
响应/
800 ka/
南大洋

Abstract:The Southern Ocean(SO) is a key place, which plays an important role in global climate change. To discuss the changes of sea surface temperature(SST) in different areas around the SO, and their responding to climate evolution during the last 800 ka, the different U₃₇^k'-SST records of Ocean Drilling Program(ODP) Site 1090, ODP site 1170 and site MD962077 around the SO had been compared, and the relationships had been discussed between SST records and other climate change proxies(such as the content of Atmospheric carbon dioxide(CO₂), δD record in the ice core, benthic δ¹³C value(δ¹⁸O_B), and so on.). Here, the result shows that:(1) the evolutions of different SST records have clearly local characteristics during the last 800 ka. During MIS(Marine Isotope Stage) 12~10, the changes of SST records between ODP site 1090 in the Southern Atlantic Ocean(SAO) and ODP site 1170 in South Tasman Sea(STS) had undergone contrary evolution trends. In detail, the glacial minimum SST value in ODP site 1090 had increased about 3.8℃, and the glacial minimum value of SST in ODP site 1170 had decreased about 1.3℃, contrarily. Otherwise, the glacial minimum value of SST became about 2.2℃ higher after MIS 10 in site MD962077. Otherwise, all the three SST records well responding to the Mid-Pleistocene transition(MPT) event basing on the filtering and wavelet analysis results. (2) Before the Mid-Brunhes event(MBE), the average and peak SST values of ODP site 1090 are always lower than those in ODP site 1170. Nevertheless, the average and peak SST values of ODP site 1090 become higher than those in ODP site 1170 during the occurrence of MBE and MIS 5, MIS 2 and MIS 1. On the other hand, the record of ΔSST_1090-1170 and other four proxies, such as CO₂, LR04-δ¹⁸O_B, Fe flux, and δD, had well coherencies during the interglacial stages than those in glacial stages during the last 800 ka. The correlation coefficient are about 0.80, 0.72, 0.69, and 0.75, respectively. Hence, we concluded that the migrating range of STF and strength change of Agulhas leakage maybe the principal factors that influenced the change of ΔSST_1090-1170. Meanwhile, the change of ΔSST_1090-1170 responding to the evolution of climate is observably during interglacial stages than those in glacial stages. It has shown that the change of solar insolation and following regional climate change, such as the moving of sea fronts, which might be one major reason for the changes of ΔSST among different seas around the SO during the last 800 ka.
Key words:sea surface temperature/
climate change/
responding/
800 ka/
Southern Ocean



PDF全文下载地址:

http://www.dsjyj.com.cn/data/article/export-pdf?id=dsjyj_11528