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首页> 外文期刊>Journal of oceanography >Internnual variations of water temperature and salinity along the 137°E meridian
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Internnual variations of water temperature and salinity along the 137°E meridian

机译：子午线沿137°E的水温和盐度的年际变化

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Analyses were performed on hydrographic data gathered along the 137°E meridian by the R/V Ryofu Maru of the Japan Meteorological Agency (JMA). Distributions were obtained of the mean and standard deviation of water temperature and salinity along the section. Relationships between interannual variations of these variables and wind forcing were examined. A correlation analysis revealed that temperature change, which occurred in the equatorial region of the western North Pacific accompanied by El Nino and La Nina events, reached about 20°N with the inclination of isotherms across the north equatorial current fluctuating around 20°N. Empirical orthogonal function (EOF) analysis of the winter water temperatures in the section was performed to extract variations following El Nino and La Nina events as the first mode and those corresponding to decadal changes of sea surface temperature (SST) in the North Pacific as the second mode. Interannual variations in the area of the North Pacific tropical saline water (NPTSW) and the North Pacific intermediate water (NPIW) along the section correspond well to interannual variations of the wind-stress curl minimum (negative value) in the area southeast of Japan. A remaining problem is to quantitatively evaluate the lag times of the variations to the wind-stress curl variation. In the equatorial region of the section, the northward extension of saline water is weak, and negative water temperature anomalies have often occurred in connection with El Nino events since the latter half of the 1970s. These changes may be part of the decadal variation of the North Pacific.
机译：由日本气象厅（JMA）的R / V Ryofu Maru对沿137°E子午线收集的水文数据进行了分析。获得沿剖面的水温和盐度的平均值和标准偏差的分布。研究了这些变量的年际变化与强迫之间的关系。相关分析表明，伴随厄尔尼诺和拉尼娜事件在北太平洋西部赤道地区发生的温度变化达到约20°N，而北赤道电流的等温线倾斜在20°N附近波动。对该断面冬季水温进行经验正交函数（EOF）分析，以提取厄尔尼诺和拉尼娜事件为第一模式后的变化，以及北太平洋海表温度（SST）年代际变化为后继的变化。第二种模式。沿该剖面的北太平洋热带盐水（NPTSW）和北太平洋中间水（NPIW）区域的年际变化与日本东南部地区的风应力卷曲最小值（负值）的年际变化非常吻合。剩下的问题是定量评估变化对风应力卷曲变化的滞后时间。在该断层的赤道地区，自1970年代下半年以来，咸水向北扩展的能力很弱，与厄尔尼诺现象有关的水温异常常发生。这些变化可能是北太平洋年代际变化的一部分。

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