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利用1999年7～10月和2003年10～12月实测的北太平洋亚热带环流区表层水~(226)Ra含量,结合文献所报道的历史数据,发现自20世纪60年代至今,北太平洋亚热带环流区表层水体~(226)Ra含量呈下降趋势,反映出全球变化导致该海域生态系结构的变化.全球增暖一方面导致了该海域水体层化作用的加强,进而导致上层水体Ra补充量的减少;另一方面,全球增暖导致海域生物生产力的升高,进而导致Ra迁出量的增加.~(226)Ra含量的上述变化与文献报道的该海域叶绿素a、硅酸盐、磷酸盐含量与初级生产力的历史变化趋势相吻合,确证北太平洋亚热带环流区在全球变化背景下正发生着可观测的生态系统变化.在上层海洋层化作用加强的情况下,为维持海域升高的生物生产力,其“新”氮可能的来源是海洋的固氮作用.
Using the measured 226 ~ (226) Ra contents of surface water in the North Pacific subtropical circulation from July to October 1999 and from October to December in 2003 and the historical data reported in the literature, it was found that since the 1960s to now, the North Pacific subtropical circulation The content of ~ (226) Ra in the surface water of the area shows a downward trend, reflecting the global changes that lead to changes in the ecosystem structure of the area. Global warming, on the one hand, has led to the stratification of water bodies in the area, On the other hand, global warming led to the increase of biological productivity in the sea area, which in turn led to an increase in the amount of Ra released.26 The above mentioned changes in Ra content have been correlated with the reported changes in chlorophyll a, silicates, phosphates Content and primary productivity consistent with the historical trend to confirm the North Pacific subtropical circulation in the context of global changes are undergoing observable changes in the ecosystem in the role of the upper stratification of the ocean to strengthen the situation to maintain the elevated organisms Productivity, its “new” nitrogen may be the source of the marine nitrogen fixation.