摘要
对南极普里兹湾NP93-2和NP95-1两柱样沉积硅藻进行了定量分析。两柱样分别可划分出3个和7个硅藻组合带。前者的优势种是Nitzschiacurta和Thalasiosiraantarctica,次优势种是N.kerguelensis和N.ritscheri;后者常见的优势种有N.kerguelensis,N.curta,Denticulopsisspp.和T.lentiginosa,常见的次优势种有Eucampiabablaustium,T.antarctica和T.gracilis。利用N.curta/N.kerguelensis比值并结合14C测年数据,可将15000年以来南极气候的变化划分出8个古气候带,其中完好地记录了Heinrich1事件、波令-阿德罗暖期、新仙女木冰期、全新世低温期等重大的气候变化事件,而南极的全新世低温期是首次报道。
Diatom floras in the cores NP93 2 and NP95 1 from the Prydz Bay,Antarctica have been analyzed.Results show that Nitzschia curta and Talassiosira lentiginosa are the dominant species and N.kerguelensis and N.ritscheri are second dominant species in the core NP93 2,and N.kerguelensis,N.curta,Denticulopsis spp. and T.lentiginosa are frequent dominant species and Eucampia balaustium,T.antarctica and T.gracilis are common second dominant species in the core NP95 1,three and seven diatom assemblage zones can be divided respectively in above two cores. According to the N.curta/N.kerguelensis ratio and the 14 C dating,the author divided paleoclimate since 15 000 a B.C. into eight paleoclimatic zones:Ⅰ.Warm period of last glacier,Ⅱ.Heinrich Event 1,Ⅲ.Bolling Allerod,Ⅳ.Younger Dryas,Ⅴ.Warm period,Ⅵ.Suitable period,Ⅶ.Short period of low temperature,Ⅷ.Warm period.It's the first time to find the short period of low temperature of Holocene in Antarctica.
出处
《极地研究》
CAS
CSCD
1997年第3期169-175,共7页
Chinese Journal of Polar Research
基金
国家海洋局极地考察办公室资助
关键词
南极
硅藻
古气候
地层
晚第四纪
气候变化
Antarctica,diatom,paleoclimate, N.curta/N.kerguelensis ratio