Flow and water property structures between the Bering Sea and Fiji in the summer of 1993
Flow and water property structures between the Bering Sea and Fiji in the summer of 1993
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1993年夏季白令海与斐济之间的流量和水体结构
DOI：
10.1029/1999jc000030
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发表时间：
2000
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通讯作者：
G. I. Roden
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文献类型：
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作者：
G. I. Roden
根据沿着179°E的高分辨率现场测量，概述了白令海和斐济群岛之间的自上而下的水流、温盐、氧气和营养盐结构。纬向流是由带状中尺度结构，反映了高度剪切结构和不稳定的主要洋流跨越日期变更线占主导地位。主要的中纬度海流宽度为100-200公里，最大速度为1.40 cm s−1，以5 cm s−1等速线测量，延伸至1.2000米。1993年的厄尔尼诺现象导致北赤道逆流与赤道潜流合并，在300米高空形成了一个600公里宽的赤道东向气流带（40-60 cm s−1）。在1500 ~ 3500 m之间，赤道气流主要向东南方向流动，而在3500 ~ 5000 m之间，赤道气流主要向西北方向流动。沿着179°E的物理化学性质分布复杂，反映了不同性质平流、混合和水团转化的影响，与带状剪切流和水流-地形相互作用相一致。在不同来源的水流之间的剪切带中，出现了定义明确的属性锋。与北太平洋和南太平洋中层和深层沃茨相关的温盐、氧和营养舌具有相当大的内部结构，表明中尺度过程和扭曲的流路。日期变更线附近的深海水流表明，较低的环极水向北移动到赫斯海隆，从那里转向向西和北，皇帝海山以西;这条海山链以东的性质非常一致。孤立的阿留申盆地的深海沃茨与邻近太平洋的海水有很大的不同，温度较高（Δ = 0.1°C），盐度较低（Δ = 0.01），氧气含量较低（Δ = 50 μmol kg−1），硅酸盐含量较丰富（Δ = 80 μmol kg−1）。一个孤立的盆地内的韦克-内克尔岭也显示出一些不寻常的底层水的特点低于窗台深度。
An overview is given of the top-to-bottom flow, thermohaline, oxygen, and nutrient structures between the Bering Sea and the Fiji islands, based on high-resolution field measurements along 179°E. The zonal flow is dominated by a banded mesoscale structure, reflecting the highly sheared structure and instabilities of the major ocean currents crossing the date line. The major midlatitude currents are 100–200 km wide, have maximum speeds of ∼40 cm s−1, and extend to ∼2000 m, when measured by the 5 cm s−1 isotach. El Nino conditions in 1993 caused a merger of the North Equatorial Countercurrent with the Equatorial Undercurrent, leading to a 600 km wide band of equatorial eastward flow (40–60 cm s−1) in the upper 300 m. Beneath, a 400 km wide and 1.2 km deep westward jet (10–30 cm s−1) is found. Between 1500 and 3500 m the equatorial flow is predominately to the southeast, and between 3500 and 5000 m it is toward the northwest. Consonant with banded shear flow and flow-topography interactions, the physical and chemical property distributions along 179°E are complicated, reflecting the effects of differential property advection, mixing, and water mass transformation. Well-defined property fronts occur in shear zones between currents of different origin. The thermohaline, oxygen, and nutrient tongues associated with North and South Pacific intermediate and deep waters have considerable internal structure, indicative of mesoscale processes and contorted flow paths. The abyssal flow near the date line indicates northward movement of lower circumpolar water to the Hess rise, whence it turns westward and north, west of the Emperor Seamounts; properties east of this seamount chain are very uniform. The deep and abyssal waters of the isolated Aleutian Basin differ substantially from those in the adjacent Pacific, by being warmer (Δ = 0.1°C), less saline (Δ = 0.01), poorer in oxygen (Δ = 50 μmol kg−1), and much richer in silicate (Δ = 80 μmol kg−1). An isolated basin within the Wake-Necker Ridge also shows some unusual bottom water characteristics below sill depth.
HIRAI,M.：Am.J.Primatol.(1989)
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