%0 Journal Article
%T 226Ra evidence for the ecosystem shift over the past 40 years in the North Pacific Subtropical Gyre<br>^226Ra evidence for the ecosystem shift over the past 40 years in the North Pacific Subtropical Gyre
%A Yang Junhong
%A Chen Min
%A Qiu Yusheng
%A Li Yanping
%A Ma Qiang
%A LvE
%A Zhang Run
%A Huang Yipu
%A <br>YANG
%A JunHong
%A CHEN
%A Min
%A QIU
%A YuSheng
%A LI
%A YanPing
%A MA
%A Qiang
%A LUE
%A E
%A ZHANG
%A Run
%A HUANG
%A YiPu
%J 科学通报(英文版)
%D 2007
%I 
%X Surface seawater was collected for ~(226)Ra measurement in the North Pacific Subtropical Gyre from July to October, 1999 and October to December, 2003. Combined with the historical data reported for this sea area, a declined trend of surface ~(226)Ra concentrations was observed since 1960s, indicating the ecosystem shift in response to global warming. On one side, the enhanced stratification of the upper water column resulting from global warming reduced the ~(226)Ra input from the depth, on the other, the temporal increase of biological production resulting from the climate-related ecosystem structure change strengthened the ~(226)Ra removal from the surface ocean. Both the physical and biological processes resulted in the decrease of surface ~(226)Ra concentrations in the North Pacific Subtropical Gyre. The temporal trend of surface ~(226)Ra concentrations was consistent with the trends of chlorophyll a, silicate, phosphate and primary production previously reported. This study provided ~(226)Ra evidence for the ecosystem shift under global change.
%K North Pacific Subtropical Gyre
%K ~(226)Ra
%K ecosystem change<br>北太平洋亚热带涡流
%K 生态系统漂变
%K 镭226
%K 放射性同位素浓度
%K 海面海水
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=CA48CF6568B80BF0591D1C81C1965504&yid=A732AF04DDA03BB3&vid=286FB2D22CF8D013&iid=B31275AF3241DB2D&sid=AB1DE136C335A86C&eid=D40528F59753C0F7&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=23