研究论文

东南极LGB69冰芯17122001年气温变化记录的初步研究

  • 张子洋 ,
  • 闫明 ,
  • MULVANEY Robert ,
  • 季峻峰 ,
  • 效存德 ,
  • 刘雷保 ,
  • 安春雷
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  • 1.中国极地研究中心,上海 200136
    2.南京大学表生地球化学教育部重点实验室,江苏 南京 210023
    3.British Antarctic Survey,High Cross,Madingley Road,Cambridge CB3 0ET,UK
    4.中国科学院 西北生态环境资源研究院,甘肃 兰州 730000
张子洋(1991-),男,广东中山人,硕士研究生,主要从事极地环境地球化学研究. E-mail:zhzyang@139.com
闫明(1966-),男,安徽怀远人,研究员,主要从事极地雪冰气候与环境记录、冰川变化研究. E-mail:mingyan@pric.org.cn

收稿日期: 2020-07-25

  修回日期: 2021-01-05

  网络出版日期: 2021-04-19

基金资助

国家自然科学基金项目“极地冰芯中记录的火山作用及其对气候的影响”(41676192)

Preliminary Study on Air Temperature Records from 1712 to 2001 Revealed by LGB69 Ice Core in East Antarctica

  • Ziyang ZHANG ,
  • Ming YAN ,
  • Robert MULVANEY ,
  • Junfeng JI ,
  • Cunde XIAO ,
  • Leibao LIU ,
  • Chunlei AN
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  • 1.Polar Research Institute of China,Shanghai 200136,China
    2.Key Laboratory of Surficial Geochemistry,Ministry of Education,Nanjing University,Nanjing 210023,China
    3.British Antarctic Survey,High Cross,Madingley Road,Cambridge CB3 0ET,UK
    4.Northwest Institue of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
ZHANG Ziyang (1991-), male, Zhongshan County, Guangdong Province, Master student. Research areas include polar environmental geochemistry. E-mail:zhzyang@139.com
YAN Ming (1966-), male, Huaiyuan County, Anhui Province, Professor. Research areas include climatic and environmental records of snow and ice, and glacier variation in polar regions. E-mail:mingyan@pric.org.cn

Received date: 2020-07-25

  Revised date: 2021-01-05

  Online published: 2021-04-19

Supported by

the National Natural Science Foundation of China "Volcanism recorded in polar ice cores and its effects on climate"(41676192)

摘要

南极冰芯记录着过去气温、降水等气候环境参数以及影响其变化的太阳活动、火山作用等各种因子变化,是研究古气候、古环境变化及其影响机制的良好载体。东南极LGB69冰芯高分辨率的地球化学分析表明:该冰芯的水当量年平均积累率高达259 mm/a,利用δ18O和Na+季节性变化和火山喷发标志层,通过数年层的方法确定其沉积时间为290 a(1712—2001年)±2 a;该冰芯δ18O与邻近的戴维斯站气温距平5年滑动平均值(1968—2001年)之间具有良好的正相关关系,是有效的气温代用指标,1712—2001年该地区气温是一个波动变暖的过程,划分为4个阶段,小冰期结束于1914年,20世纪5年滑动平均气温距平年平均值较小冰期末次冷阶段升高0.43 ℃;Morlet小波分析表明,1712—2001年该冰芯δ18O(气温)和积累率(降水量)均存在约11年、约22年和约60年的共同周期,多重时间周期的嵌套表明其对气候变化非常敏感。上述研究结果为进一步重建南极气候冷暖、降水序列变化,以及研究太阳活动、火山作用等因子对气候变化影响的内在规律奠定了基础。

本文引用格式

张子洋 , 闫明 , MULVANEY Robert , 季峻峰 , 效存德 , 刘雷保 , 安春雷 . 东南极LGB69冰芯17122001年气温变化记录的初步研究[J]. 地球科学进展, 2021 , 36(2) : 172 -184 . DOI: 10.11867/j.issn.1001-8166.2021.012

Abstract

Antarctic ice core is an ideal paleoclimatic and paleoenvironmental carrier, which records the past variations of various parameters such as air temperature, precipitation and their major factors, e.g. solar activity, volcanism. High-resolution geochemical analyses of LGB69 ice core, East Antarctica show that Based on the combination of seasonal variations of δ18O and Na+ with volcanic eruption markers, LGB69 ice core is dated to 290 a (A.D.1712-A.D.2001)±2 a through annual layer counting, with a high average annual accumulation rate of 259 mm w.e./a; Five-year moving average (A.D.1968-A.D.2001) of δ18O of LGB69 ice core has good positive correlation with that of temperature departure at adjacent Davis Station, indicating that δ18O is an effective proxy for air temperature. Air temperature from A.D.1712 to A.D.2001 in LGB69 region is a process of fluctuating warming, which can be divided into four stages. The average annual value of 5-year moving average temperature departure is 0.43 ℃ higher than that of last cold stage in the Little Ice Age which ended in A.D.1914; By Morlet wavelet analysis, both δ18O (air temperature) and accumulation rate (precipitation) of LGB69 ice core from A.D.1712 to A.D.2001 present ca. 11-year, ca. 22-year and ca. 60-year cycles. Multinest of cycles for δ18O, accumulation rate of LGB69 ice core implies its sensitivity to climate change. The above-mentioned results build up a good basis for further research on the reconstruction of temporal variations in air temperature and precipitation and the effects of factors such as solar activity, volcanism on climate change in Antarctica.

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