A 2680-year record of sea ice extent in the Ross Sea and the associated atmospheric circulation derived from the DT401 East Antarctic ice core  

作　　者：LI ChuanJin REN JiaWen XIAO CunDe HOU ShuGui DING MingHu QIN DaHe 

机构地区：[1]State Key Laboratory of the Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences [2]School of Geographic and Oceanographic Sciences, Nanjing University [3]Chinese Academy of Meteorological Sciences

出　　处：《Science China Earth Sciences》2015年第11期2090-2102,共13页中国科学（地球科学英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.41121001);National Basic Research Program of China(Grant No.2013CBA01804);State Key Laboratory of Cryospheric Sciences,National Natural Science Foundation of China(Grant No.41201069);State Oceanic Administration of People’s Republic of China Project on Climate in Polar Regions(Grant Nos.CHINARE 2014-04-04,CHINARE 2014-02-02);the Foundation for Excellent Youth Scholars of CAREERI,CAS

摘　　要：Long time series of Antarctic sea ice extent （SIE） are important for climate research and model forecasting. A historic ice extent in the Ross Sea in early austral winter was rebuilt through sea salt ions in the DT401 ice core in interior East Antarctica. El Nino-Southern Oscillation （ENSO） had a significant influence on the sea salt deposition in DT401 through its influence on the Ross Sea SIE and the transport of sea salt inland. Spectral analysis also supported the influence of ENSO with a significant 2-6 a periodicity band. In addition, statistically significant decadal （10 a） and pentadecadal （50-70 a） periodicities suggested the existence of a teleconnection from the Pacific decadal oscillation （PDO）, which originated from sea surface temperature anomalies in the tropical Pacific Ocean. The first eigenvector of the empirical orthogonal function analysis （EOF1） showed lower values during the Medieval Warm Period （MWP）, while higher values were found in the Little Ice Age （LIA）. A higher frequency of ENSO events were found in the cold climatic stage, The post 1800 AD period was occupied by significant fluctuations of the EOF1, and PDO may be one of the influencing factors. The EOF1 values showed moderate fluctuations from 680 BC to 1000 AD, showing that the climate was relatively stable in this period.Long time series of Antarctic sea ice extent(SIE) are important for climate research and model forecasting. A historic ice extent in the Ross Sea in early austral winter was rebuilt through sea salt ions in the DT401 ice core in interior East Antarctica. El Ni?o-Southern Oscillation(ENSO) had a significant influence on the sea salt deposition in DT401 through its influence on the Ross Sea SIE and the transport of sea salt inland. Spectral analysis also supported the influence of ENSO with a significant 2–6 a periodicity band. In addition, statistically significant decadal(10 a) and pentadecadal(50–70 a) periodicities suggested the existence of a teleconnection from the Pacific decadal oscillation(PDO), which originated from sea surface temperature anomalies in the tropical Pacific Ocean. The first eigenvector of the empirical orthogonal function analysis(EOF1) showed lower values during the Medieval Warm Period(MWP), while higher values were found in the Little Ice Age(LIA). A higher frequency of ENSO events were found in the cold climatic stage. The post 1800 AD period was occupied by significant fluctuations of the EOF1, and PDO may be one of the influencing factors. The EOF1 values showed moderate fluctuations from 680 BC to 1000 AD, showing that the climate was relatively stable in this period.

关 键 词：sea salt ions sea ice extent ENSO DT401 Eastern Antarctica 

分 类 号：P731.15[天文地球—海洋科学] P461.2