| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
YE Xiaoxian, Harunur Rashid. Changes of the upper water column at the 45°N North Atlantic since marine isotope stage 3[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 114-123. doi: 10.16562/j.cnki.0256-1492.2020073102
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Changes of the upper water column at the 45°N North Atlantic since marine isotope stage 3
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Abstract
The 45°N of North Atlantic is located at the central zone of the ice-rafted detritus (IRD) belt of the North Atlantic, where the marine sediments contain rich environmental and climatic information of high-resolution. The sedimentary records there are used for reconstruction of the pale-oceanic environment since the last glacial in this study. IRD contents, planktonic foraminiferal assemblages and their oxygen and carbon isotopes (δ18O and δ13C) from the core Hu71-377, are used as major tools. Combined with AMS14C dating and oxygen isotope stratigraphy, five Heinrich layers are identified in the MIS3 and MIS2, in which the Heinrich layer 1, 2 and 4 have obvious IRD peaks, high relative abundance of Neogloboquadrina pachyderma and light δ18O values, but no obvious light δ18O are observed in the Heinrich layer 3 and 5. The difference in δ18O between the Heinrich layers 3 and 5 and the Heinrich layers 1, 2 and 4 may suggest the impacts of melt water on the upper water column. Further, the offsets between δ13CN.incompta and δ13CN.pachyderma may also reflect the changes in the mixed layer and thermocline during the Heinrich events. The δ13C offsets were close to zero during Heinrich 1 and Heinrich 2, attributing to the vertical mixing of seawater driven by strong winds. And the δ13C offsets became larger during Heinrich 4 and Heinrich 5, indicating that the seasonal thermocline became shallower, which supports the inference of the penetration of the North Atlantic Current. What’s more, the planktonic foraminiferal assemblages may reflect the properties of the water masses in the upper water column, especially the relative abundance of N. pachyderma and Neogloboquadrina incompta may indicate the sea surface temperature (SST) changes during MIS3.
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References
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YE Xiaoxian, Harunur Rashid. Changes of the upper water column at the 45°N North Atlantic since marine isotope stage 3[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 114-123. doi: 10.16562/j.cnki.0256-1492.2020073102
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Figure 1.
Location map for Core Hu71-377 and related cores[8,28-29]and the distribution of currents and SST in the North Atlantic
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Figure 2.
The depth-age model（a）and sedimentation rates of core Hu71-377（b）
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Figure 3.
IRD, relative abundance of N. pachyderma and δ18O in core Hu71-377 and their correlation with core DSDP609[36], ice core NGRIP[35] and core SU9008[28]
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Figure 4.
IRD, relative abundance of foraminifera, δ18O and δ13C, and weights of foraminifera in core Hu71-377 and their correlation with δ18O and δ13C from core SO82_5-2[29] and core DSDP609[37]