Development of Ba-Si/N diagram in the ocean

1.在σ 4 = 45.86的等深线层上，研究了钡（Ba）和硅酸盐/硝酸盐比值（Si/N）沿着深海温盐环流路径的水平分布。与北大西洋北方深水相比，北太平洋北方深水中Ba的浓度高约3.5倍，Si/N比高约9倍.本文研究了北太平洋、东印度洋、南太平洋西部的塔斯曼海、东赤道太平洋、亚南极洋和南极洋以及邻近的鄂霍次克海、日本海、华南海、苏禄海（SL）和安达曼海（ADM）。在Ba-Si/N图分析的基础上，发现在每个盆地中，这两个参数之间存在线性关系。回归关系式和相关系数为：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）日本：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）因此，该关系的斜率在南极洋最小，而在北太平洋最大。这些结果表明，各海盆的Ba-Si/N图上所显示的线性相关关系对重建过去的海水成分Ba/Si/N是有用的，并可作为多海洋学代用指标

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