极地研究 ›› 2011, Vol. 22 ›› Issue (4-English): 205-214.DOI: 10.3724/SP.J.1085.2011.00205

• 研究论文 •    下一篇

Stable oxygen and carbon isotopes from the planktonic foraminifera Neogloboquadrina pachyderma in the western Arctic surface sediments: implications for water mass distribution

  

  • 收稿日期:2011-08-01 修回日期:2011-10-12 出版日期:1961-12-30 发布日期:1961-12-30
  • 基金资助:

    国家基础研究规划项目“气候演变的热带驱动与碳循环周期性”;国家自然科学基金重点项目;中国国际极地年项目(2007-2009);中国气候变化地质记录对全球气候变化重要事件响应

Stable oxygen and carbon isotopes from the planktonic foraminifera Neogloboquadrina pachyderma in the western Arctic surface sediments: implications for water mass distribution

XIAO Wenshen   WANG Rujian   CHENG Xinrong   

  1. State key laboratory of Marine Geology, Tongji University
  • Received:2011-08-01 Revised:2011-10-12 Online:1961-12-30 Published:1961-12-30
  • Contact: XIAO Wenshen
  • Supported by:

    the National Basic Research Program of China;Chinese IPY Program (2007-2009);China Geological Survey Project

摘要:

Neogloboquadrina pachyderma (sin.) (Nps) is the most abundant planktonic foraminifera species in the polar oceans. The δ18O and δ13C of Nps from the western Arctic Ocean sediments were analyzed to reveal the implications of the proxies to environmental changes. The δ18O records of Nps in the Chukchi Sea reflect the water mass distribution in this area. Heavy δ18O values are along the Anadyr Current (AC) and light values in the central and eastern Chukchi Sea may reflect the freshwater signal in the Alaska Coastal Current (ACC) and Bering Sea Shelf Water (BSSW). Light δ18O signature in the high Arctic basin comes from the freshwater stored in the Arctic surface layer. The δ13C distribution pattern in the Chukchi Sea is also influenced by the current system. High primary productivity along the AC results in heavy δ13C; relatively lower primary productivity and the freshwater component in the BSSW and ACC may be the reason for the light δ13C in the central and eastern Chukchi Sea. Our data reveal the importance of well ventilated Pacific Water through Chukchi Sea into the Arctic Ocean.

关键词: δ18O, δ13C, Neogloboquadrina pachyderma, Western Arctic Ocean

Abstract:

Neogloboquadrina pachyderma (sin.) (Nps) is the most abundant planktonic foraminifera species in the polar oceans. The δ18O and δ13C of Nps from the western Arctic Ocean sediments were analyzed to reveal the implications of the proxies to environmental changes. The δ18O records of Nps in the Chukchi Sea reflect the water mass distribution in this area. Heavy δ18O values are along the Anadyr Current (AC) and light values in the central and eastern Chukchi Sea may reflect the freshwater signal in the Alaska Coastal Current (ACC) and Bering Sea Shelf Water (BSSW). Light δ18O signature in the high Arctic basin comes from the freshwater stored in the Arctic surface layer. The δ13C distribution pattern in the Chukchi Sea is also influenced by the current system. High primary productivity along the AC results in heavy δ13C; relatively lower primary productivity and the freshwater component in the BSSW and ACC may be the reason for the light δ13C in the central and eastern Chukchi Sea. Our data reveal the importance of well ventilated Pacific Water through Chukchi Sea into the Arctic Ocean.

Key words: δ18O, δ13C, Neogloboquadrina pachyderma, Western Arctic Ocean