The evolution of paleoproductivity since the Middle Holocene in the Cosmonaut Sea, Antarctic

doi:10.13745/j.esf.sf.2022.1.12

Abstract

Abstract:

Aiming to reconstruct the paleoproductivity evolution and its constraints in the Cosmonaut Sea since the Middle Holocene (6500 Cal a BP), a series of experiments including AMS¹⁴C dating, radionuclide ²¹⁰Pb testing, XRF core scan, multi-parameter spectrophotometer probe as well as major and trace elemental analysis were conducted on sediment core ANT36-C4-05 collected from the Cosmonaut Sea, Antarctic. The results showed that paleoproductivity in the Cosmonaut Sea fluctuates strongly since the Middle Holocene, and its evolutionary trend is largely consistent with the temperature change in Antarctic constrained mainly by the change of sea ice range. During the period of 6500-5200 Cal a BP, paleoproductivity increased rapidly with increasing temperature and decreasing sea ice range, and remained high with little fluctuation between 5200-3350 Cal a BP. During 3350-2000 Cal a BP siliceous and calcareous productivity decreased with decreasing temperature and expanding sea ice range. Paleoproductivity variability became complex with smaller fluctuation during 2000-0 Cal a BP. Moreover, sedimentary records of the Cosmonaut Sea since the Middle Holocene showed that the most obvious paleoproductivity fluctuations were associated with the cold period of 5500 Cal a BP, the Dark Age Cold Period, the Medieval Warm Period, and the Little Ice Age.

Key words: Cosmonaut Sea, paleoproductivity, climatic change, sedimentary environment

CLC Number:

P467
P736.21

HU Bingyao, LONG Feijiang, HAN Xibin, ZHANG Yongcong, HU Liangming, XIANG Bo, GE Qian, BIAN Yeping. The evolution of paleoproductivity since the Middle Holocene in the Cosmonaut Sea, Antarctic[J]. Earth Science Frontiers, 2022, 29(4): 113-122.

Figures/Tables 5

Fig.1 Location of sediment core ANT36-C4-05, oceanic circulation and front in the Cosmonaut Sea, and modern-day sea ice range during summer and winter in Antarctica. Modified after [25-26]. EDML-EPICA ice cores from Dronning Maud Land

Table 1 AMS14C dating results and calibrated ages of sediment samples from core ANT36-C4-05

实验室编号	样品深度编号	测试材料	测试值/ a BP	校正年龄/a	老碳年龄/a	日历年龄/ Cal a BP
Beta-567729	C4-05-00	有机碳	3 820±30	2 233	2 233	0
Beta-567729	C4-05-05	有机碳	5 700±30	4 512	2 233	2 279
Beta-567729	C4-05-11	有机碳	8 280±30	7 432	2 233	5 199
Beta-567729	C4-05-17	有机碳	9 860±40	9 200	2 233	6 967
Beta-567729	C4-05-23	有机碳	9 490±40	8 733	2 233	6 500

Fig.2 210Pbex vertical profile of core ANT36-C4-05

Fig.3 Age model and sedimentation rate of core ANT36-C4-05

Fig.4 Paleoproductivity proxies in core ANT36-C4-05 (g-m) compared with solar insolation (a), sea surface temperature change (b), EDML CH4 (c), EDML ssNa+(d), EDML δ18O (e), and Taylor Dome δ18O (f)

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