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首页> 外文期刊>Journal of oceanography >ENSO indices from sea surface salinity observed by Aquarius and Argo
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ENSO indices from sea surface salinity observed by Aquarius and Argo

机译：水瓶座和阿尔戈观测到的海表盐度的ENSO指数

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Analysis of the first 26 months of data from the Aquarius satellite confirms the existence of a sharp sea surface salinity (SSS) front along the equator in the western equatorial Pacific. Following several earlier studies, we use the longitudinal location of the 34.8-psu isohaline as an index, termed Nino-S34.8, to measure the zonal displacement of the SSS front and consequently the eastern edge of the western Pacific warm pool. The on-going collection of the Array for Real-time Geostrophic Oceanography (ARGO) program data shows high correlations between Nino-S34.8 and the existing indices of El Nino, suggesting its potential important role in ENSO evolution. Further analysis of the ARGO data reveals that SSS variability in the southeastern tropical Pacific is crucial to identify the type of El Nino. A new SSS index, termed the southeastern Pacific SSS index (SEPSI), is defined based on the SSS variability in the region (0°-10°S, 150°-90°W). The SEPSI is highly correlated with the El Nino Modoki index, as well as the Trans-Nino index, introduced by previous studies. It has large positive anomalies during central Pacific El Nino or El Nino Modoki events, as a result of enhanced zonal sea surface temperature gradients between the central and eastern tropical Pacific, and can be used to characterize the type of El Nino. The processes that possibly control these SSS indices are also discussed.
机译：通过对水瓶座卫星前26个月数据的分析，确认了赤道西太平洋赤道沿线存在尖锐的海面盐度（SSS）锋线。在进行了几项较早的研究之后，我们将34.8-psu等咸的纵向位置称为Nino-S34.8，用于测量SSS前沿的区域位移，从而测量西太平洋暖池的东部边缘。正在进行的实时地转海洋学阵列（ARGO）程序数据收集显示，Nino-S34.8与厄尔尼诺现象的现有指数之间具有高度相关性，表明其在ENSO演化中的潜在重要作用。对ARGO数据的进一步分析表明，东南热带太平洋的SSS变异性对于确定厄尔尼诺现象的类型至关重要。根据该地区（0°-10°S，150°-90°W）的SSS变异性，定义了一个新的SSS指数，称为东南太平洋SSS指数（SEPSI）。 SEPSI与先前研究引入的El Nino Modoki指数以及Trans-Nino指数高度相关。由于中部和东部热带太平洋之间纬向海表温度梯度的增强，在太平洋中部厄尔尼诺或厄尔尼诺·莫多基事件期间，它具有较大的正距平，可用于表征厄尔尼诺的类型。还讨论了可能控制这些SSS索引的过程。

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