Development of Ba-Si/N diagram in the ocean

1.在Sigma4=45.86等光层，研究了沿深海温盐环流路径的Ba值和硅酸盐/硝酸盐比(Si/N)的水平分布。与北大西洋北部的深水相比，北太平洋的Ba浓度约为3.5倍，Si/N比约高9倍。研究了北太平洋、东印度洋、西南太平洋塔斯曼海、东赤道太平洋、次南极洋和南极洋以及邻近的鄂霍次克海、日本海、南中国海、苏鲁海和安达曼海中Ba含量与Si/N比值的关系。通过对各盆地的Ba-Si/N图的分析，发现两个参数之间存在线性关系。回归关系和相关系数如下；NP：BA=2.1 32.4(Si/N)R^2=0.98(1)EI：BA=33.5 18.4(Si/N)R^2=0.97(2)TSM：BA=32.3 23.2(Si/N)R^2=0.97(3)EEqP：BA=15.6 32.4(Si/N)R^2=0.99(4)SAA：BA=52.1 12.8(Si/N)R^2=0.96(5)AA：BA=57.4 10.6(Si/N)R^2=0.92(6)OHT：BA=17.5 241(Si/N)R^2=0.97(7)JPN：BA=30.8 15.2(Si/N)R^2=0.85(8)SC：BA=3.5 28.3(Si/N)R^2=0.99(9)SL：BA=24.3 17.5(Si/N)R^2=0.98(10)ADM：BA=25.9 20.2(Si/N)R^2=0.99(11)该关系的斜率在南冰洋最小，而在北太平洋最大。这些结果表明，各大洋盆地的Ba-Si/N图上所示的线性相关关系对于恢复过去的海水组成BaVS i/N是有用的，并可作为一个典型的海洋学指标

1. Horizontal distributions of barium (Ba) and silicate/nitrate ratio (Si/N) along the pathway of the deep-sea thermohaline circulation in the ocean were examined at the isopicnal horizon of sigma4=45.86. Comparing to the deep water in the northern North Atlantic, Ba concentration is ca.3.5 fold and the ratio of Si/N is ca.9 fold higher in the northern North Pacific.2. The relationship between the concentration of Ba and the ratio of Si/N was examined in the oceans which are the North Pacific (NP), Eastern Indian, Tasman Sea of the western South Pacific (TSM), East Equatorial Pacific (EEqP), Sub Antarctic Ocean (SAA) and Antarctic Ocean (AA), and also in the adjacent seas which are Okhotsk (OHT), Japan (JPN), South China (SC), Sulu (SL) and Andaman (ADM) Seas. In the basis on the analysis by the Ba-Si/N diagram, the linear relations between the two parameters were found in each basin. Those regression relations and correlation coefficients are as follows ;NP:Ba=2.1+32.4(Si/N) R^2=0.98 (1)EI:Ba=33.5+18.4(Si/N) R^2=0.97 (2)TSM:Ba=32.3+23.2(Si/N) R^2=0.97 (3)EEqP:Ba=15.6+32.4(Si/N) R^2=0.99 (4)SAA:Ba=52.1+12.8(Si/N) R^2=0.96 (5)AA:Ba=57.4+10.6(Si/N) R^2=0.92 (6)OHT:Ba=17.5+24.1(Si/N) R^2=0.97 (7)JPN:Ba=30.8+15.2(Si/N) R^2=0.85 (8)SC:Ba=3.5+28.3(Si/N) R^2=0.99 (9)SL:Ba=24.3+17.5(Si/N) R^2=0.98 (10)ADM:Ba=25.9+20.2(Si/N) R^2=0.99 (11)Consequently, the minimum slope of the relation was obtained in the Antarctic Ocean, oppositely the maximum in the North Pacific Ocean. These results demonstrate that the linear correlationship shown on the Ba-Si/N diagram in each oceanic basin is useful for reconstructing the past seawater composition, Ba vs Si/N, and serves as a pleoceanographic proxy