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首页> 外文期刊>Progress in Oceanography >Upper ocean hydrology of the Northern Humboldt Current System at seasonal, interannual and interdecadal scales
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Upper ocean hydrology of the Northern Humboldt Current System at seasonal, interannual and interdecadal scales

机译：季节性，年际和年代际尺度的北部洪堡洋流系统的上层海洋水文学

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Since the 1960s, the Instituto del Mar del Peril (IMARPE) collected tens of thousands of in-situ temperature and salinity profiles in the Northern Humboldt Current System (NHCS). In this study, we blend this unique database with the historical in-situ profiles available from the World Ocean Database for the period 1960-2014 and apply a four-dimensional interpolation scheme to construct a seasonal climatology of temperature and salinity of the NHCS. The resulting interpolated temperature and salinity fields are gridded at a high spatial resolution (0.1 degrees x 0.1 degrees in latitude/longitude) between the surface and 1000 m depth, providing a detailed view of the hydrology and geostrophic circulation of this region. In particular, the mean distribution and characteristics of the main water-masses in the upper ocean of the NHCS are described, as well as their seasonal variations between austral summer and winter. The coastal upwelling region is well documented due to the increased data density along 3 highlighted cross-shore vertical sections off Paita (similar to 5 degrees S), Chimbote (similar to 9 degrees S) and San Juan (similar to 16.5 degrees S). The large and long-term database also allowed us, through a composite analysis, to investigate the impact of the eastern Pacific El Nino and La Nina events on the NHCS hydrology. On average, during these periods, large temperature (+/- 3-4 degrees C) and salinity (+/- 0.1-0.2) anomalies are observed, impacting the water column of the coastal ocean off Peru down to 100-200 m depth. At 100 km from the coast, these anomalies are associated with a maximum deepening (shoaling, respectively) of the thermocline of 60 m (25 m) during composite El Nino (La Nina) events. At interdecadal scale, a similar approach reveals sea-surface temperature variations of +/- 0.5 degrees C, associated with a deepening (shoaling) of the thermocline of 5-10 m during warm (cold) periods.
机译：自1960年代以来，Mar del Peril研究所（IMARPE）在北部洪堡洋流系统（NHCS）中收集了成千上万的原位温度和盐度剖面。在这项研究中，我们将这个独特的数据库与可从1960-2014年间的世界海洋数据库获得的历史原地资料进行了混合，并应用了二维插值方案来构建NHCS的温度和盐度的季节性气候学。所得的内插温度和盐度场在地表和1000 m深度之间以高空间分辨率（0.1度x 0.1度经度/纬度）网格化，从而提供了该地区水文和地转的详细信息。特别是描述了NHCS上层海洋中主要水团的平均分布和特征，以及夏季和冬季南半球的季节性变化。由于沿Paita（约5 S），Chimbote（约9 S）和San Juan（约16.5 S）附近的3个突出显示的跨海岸垂直剖面的数据密度增加，沿海上升流地区得到了很好的记录。大型且长期的数据库还使我们能够通过综合分析来调查东太平洋厄尔尼诺事件和拉尼娜事件对NHCS水文学的影响。平均而言，在这些时期内，观测到大的温度（+/- 3-4摄氏度）和盐度（+/- 0.1-0.2）异常，影响了秘鲁深至100-200 m深度的沿海海洋水柱。在距海岸100公里处，这些异常与El Nino（La Nina）组合事件期间温跃层的最大加深（分别为浅滩）60 m（25 m）有关。在年代际尺度上，一种类似的方法揭示了海面温度变化为+/- 0.5摄氏度，这与在温暖（寒冷）期间5-10 m的温跃层加深（浅滩）有关。

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