The linkage between environmental conditions in the coastal ocean and the open sea varies greatly by region. It is important to clarify, on an area-by-area basis, what coastal monitoring information reveals about the open ocean and how much predictive information for the open ocean may be applicable to the coastal ocean. The Pacific Ocean off the coast of Peru is a monitoring area for the El Niño/La Niña, an oceanic–atmospheric phenomenon of global importance. However, there are not many reliable data along the Peruvian coast. We deployed a network of 6 logger sites along the Peruvian coast during 2017–2020 and compiled a useful, high-resolution dataset of water temperatures. We examined a possible link between temperatures in the coastal waters of Peru and the open sea by comparing the new dataset with historical temperatures in the open ocean. We confirmed that monthly mean anomalies of seashore water temperatures in coastal Peru were strongly correlated with those of open ocean sea surface temperatures. With one exception, the correlation coefficients ranged from 0.80 to 0.92 and were significant at p < 0.01. This result suggested that data obtained from monitoring along the Pacific coast of Peru could be used to indicate the state of the open ocean and that El Niño forecasts for the open ocean could be applied to coastal forecasting as well. Spectral analysis revealed that the periods of changes of seashore water temperature peaked at 80 and 120 days in the region north of 5° S. This result suggested that coastal monitoring might capture intraseasonal dynamics of equatorial Kelvin waves. The absence of clear peaks south of 5° S implied that equatorial wave energy did not penetrate far into off-equatorial regions along the Peruvian coast on intraseasonal timescales.

沿海海洋和公海环境条件之间的联系因地区而异。重要的是要逐个地区地澄清沿海监测信息揭示了有关公海的哪些信息，以及公海的预测信息有多少可能适用于沿海海洋。秘鲁海岸附近的太平洋是厄尔尼诺/拉尼娜现象的监测区，厄尔尼诺/拉尼娜现象是一种具有全球重要性的海洋-大气现象。然而，秘鲁沿海并没有太多可靠的数据。2017 年至 2020 年期间，我们在秘鲁海岸部署了由 6 个记录仪站点组成的网络，并编制了有用的高分辨率水温数据集。通过将新数据集与公海的历史温度进行比较，我们研究了秘鲁沿海水域和公海温度之间可能存在的联系。我们证实，秘鲁沿海海岸水温的月平均异常与公海海面温度的异常密切相关。除一例外，相关系数范围为 0.80 至 0.92，并且在p  < 0.01。这一结果表明，从秘鲁太平洋沿岸监测获得的数据可用于指示公海状况，而公海的厄尔尼诺预报也可应用于沿海预报。光谱分析表明，南纬5°以北地区海岸水温变化周期在80天和120天达到峰值。这一结果表明，海岸监测可以捕捉赤道开尔文波的季节内动态。南纬 5°以南没有明显的峰值，这意味着在季节内的时间尺度上，赤道波能并未深入秘鲁海岸沿赤道以外的区域。