Temperature and salinity indices at Northwest Atlantic Fisheries Organization regulatory area (1988-2022)

in 1988, the spanish institute of oceanography (cn-ieo/csic) initiated a series of oceanographic campaigns in the nafo regulatory area, incorporating ctd measurements to characterize the water column. temporal indices have been calculated using 5832 ctd profiles from may to the end of august, from 1988 to 2022.analysis of the bathymetry and thermohaline characteristics of the area reveal notable differences in salinity and temperature. based on these findings, the newfoundland banks can be divided into three zones: northeast, northwest, and south. these variations become more evident in surface salinity. in the northeast region (46-49°n, 43-47°w), salinity values are significantly higher than in the northwest (46-49°n, 47-49°w), while the southern area (42-46°n, 49-53°w) displays less pronounced extremes than the northern ones. these variations were proved by calculating pearson correlation coefficients, which have low values showing a decoupling of the regions.to generate the indices, two depths were considered: at 10 ± 5 m, to represent surface conditions, and at 250 ± 5 m, as average depth of the zone. for each parameter (temperature and salinity) the annual mean was calculated, resulting in twelve series which can be considered as reference for each zone and depth. these series have been detrended, producing anomaly indices that are suitable to use in climatic variability studies.

于1988年，西班牙海洋研究所（CN-IEO/CSIC）在NAFO监管区域内启动了一系列海洋调查活动，其中纳入了CTD测量以表征水柱特性。通过使用自1988年至2022年5月至8月底的5832个CTD剖面数据，计算了时间指数。对该区域的海底地形和热盐特性的分析揭示了盐度和温度的显著差异。基于这些发现，纽芬兰群岛可以划分为三个区域：东北、西北和南部。这些差异在表层盐度中表现得尤为明显。在东北区域（46-49°N，43-47°W），盐度值显著高于西北区域（46-49°N，47-49°W），而南部区域（42-46°N，49-53°W）的极端差异较北部区域而言并不显著。这些差异通过计算皮尔逊相关系数得到了证实，低值表明了区域间的解耦。为了生成指数，考虑了两个深度：10 ± 5米，以代表表层条件；250 ± 5米，作为该区域的平均深度。对于每个参数（温度和盐度），计算了年平均值，从而得到十二个系列，这些系列可以被视为每个区域和深度的参考。这些系列经过去趋势处理，产生了适用于气候变率研究的异常指数。