| 中全新世以来南极宇航员海的古生产力演变 |
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| 引用本文： | 胡栟铫,龙飞江,韩喜彬,张泳聪,胡良明,向波,葛倩,边叶萍.中全新世以来南极宇航员海的古生产力演变[J].地学前缘,2022,29(4):113-122. |
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| 作者姓名： | 胡栟铫 龙飞江 韩喜彬 张泳聪 胡良明 向波 葛倩 边叶萍 |
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| 作者单位： | 1.成都理工大学 沉积地质研究院, 四川 成都 6100592.自然资源部海底科学重点实验室, 浙江 杭州 3100123.自然资源部第二海洋研究所, 浙江 杭州 310012 |
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| 基金项目： | 自然资源部专项“南极重点海域对气候变化的响应和影响(IRASCC2020-2022);中央级公益性科研院所基本科研业务费专项资金项目(SZ2102);中央级公益性科研院所基本科研业务费专项资金项目(YJJC2001);中央级公益性科研院所基本科研业务费专项资金项目(YJJC2003);上海交通大学“深蓝计划”基金(SL2002) |
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| 摘 要： | 本文通过对南极宇航员海ANT36-C4-05岩心的放射性核素210Pb、AMS14C测年、XRF岩心扫描、多参数物性扫描和主、微量元素的测试分析,重建了该海区中全新世(6 500 Cal a BP)以来的古生产力演变及其制约因素。研究结果表明,中全新世以来宇航员海古生产力波动较强,其演变趋势与南极气温变化基本一致,受海冰范围变化制约较大。在6 500~5 200 Cal a BP期间宇航员海古生产力随着温度升高和海冰范围减小而快速上升;在5 200~3 350 Cal a BP期间宇航员海的古生产力处于高值期,波动较小;在3 350~2 000 Cal a BP期间随着温度降低和海冰范围的扩大,硅质、钙质生产力下降;在2 000~0 Cal a BP期间古生产力水平变化复杂,变化程度相较于之前小。同时,中全新世以来宇航员海区沉积记录较好地反映了5 500 Cal a BP冷事件、DACP冷事件、MWP暖期和LIA冷事件的气候变化,受冷、暖事件影响导致的古生产力的变化最为明显。
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| 关 键 词： | 宇航员海 古生产力 气候变化 沉积环境 |
| 收稿时间： | 2021-09-22 |
The evolution of paleoproductivity since the Middle Holocene in the Cosmonaut Sea,Antarctic |
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| 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. |
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| Authors: | HU Bingyao LONG Feijiang HAN Xibin ZHANG Yongcong HU Liangming XIANG Bo GE Qian BIAN Yeping |
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| Institution: | 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China2. Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China3. Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China |
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| 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. |
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| Keywords: | Cosmonaut Sea paleoproductivity climatic change sedimentary environment |
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