Interannual variation of the upper portion of the Japan Sea Proper Water and its probable cause
Interannual variation of the upper portion of the Japan Sea Proper Water and its probable cause
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日本海上部原水的年际变化及其可能原因
DOI：
10.1007/bf02236531
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发表时间：
1996
影响因子：
2.3
通讯作者：
H. Sudo
中科院分区：
文献类型：
--
作者：
T. Senjyu;H. Sudo
根据 1965 年至 1982 年在日本海西北部 PM10 和大和盆地 PM05 处采集的水文数据，研究了日本海原生水 (UJSPW) 上部水性质的长期变化。在位于 UJSPW 形成区域南边界的 PM10 处，UJSPW 核心的溶解氧波动与磷酸盐变化呈负相关，但没有显示出变化。与盐度变化显着相关。除盐度外，PM05 时水特性的波动幅度小于 PM10 时的波动幅度。 PM10 的溶解氧变化领先 PM05 的溶解氧变化 12-15 个月，表明 PM10 附近的 UJSPW 循环进入大和盆地需要 12-15 个月。夏季 PM10 相关等密度表面溶解氧含量的增加发生在寒冷和/或多风的冬季之后，除了八个中的两个之外；这表明较大体积的UJSPW是在几个冬季形成的。根据气候数据集对 UJSPW 的形成速率和现有体积进行粗略估计；分别为1.5×104km3yr−1和27.3×104km3。 UJSPW 的通风时间为 18.2 年，约为整个日本海原水停留时间的十分之一或更少。这表明 UJSPW 的更新速度大约是更深水的十倍。
The long-term variation of water properties in the upper portion of the Japan Sea Proper Water (UJSPW) is examined on the basis of hydrographic data at PM10, located on the northwestern Japan Sea, and at PM05, in the Yamato Basin, taken from 1965 through 1982. At PM10, located at the southern boundary of the UJSPW formation region, dissolved oxygen fluctuations on the UJSPW core showed negative correlation with phosphate variations, but showed no signficant correlation with salinity variations. At PM05 water properties fluctuated with smaller amplitudes than those at PM10 except for salinity. Dissolved oxygen variations at PM10 lead those at PM05 by 12–15 months, suggesting that the UJSPW near PM10 circulates into the Yamato Basin spending 12–15 months. Increases of dissolved oxygen contents in summer on relevant isopycnal surfaces at PM10 occurred after cold and/or windy winters except for two of eight; this suggests that larger volume of the UJSPW is formed in severa winter. Rough estimations of the formation rate and existing volume of the UJSPW are made on the basis of a climatological dataset; 1.5×104km3yr−1and 27.3×104km3, respectively. The ventilation time of the UJSPW, 18.2 years, is about one tenth or less of residence time for the entire Japan Sea Proper Water. This indicates that the UJSPW is renewed about ten times as quick as the deeper water.