The infuence of sampling frequency on the study of time variations of hydrographic parameters (1974-1977)

The hydrographic conditions in the northern Kattegat were investigated in a 5 year project study called 'The Baltic Entrance Project: the GF Section'. In this study two sampling series at the same location are compared. The sampling frequencies differ by a factor 15. The impact on mean values of salinity and total phosphorus is discussed. The high frequency data are thinned and re-processed. Simulations of low frequency sampling are performed using high frequency data. The choice of sampling occasions and sampling frequency is important since it will influence both short and long term values, especially of surface salinity. The data has been quality controlled.

在名为“波罗的海入口项目：GF区域”的五年项目研究中，对北部卡特加特海域的水文条件进行了探讨。在该研究中，同一地点的两个采样系列被进行比较。采样频率相差15倍。对盐度和总磷的平均值的影响进行了讨论。高频数据被稀疏处理并重新加工。利用高频数据进行了低频采样的模拟。采样时间和采样频率的选择至关重要，因为它将影响短期和长期值，尤其是表层盐度。数据已经过质量控制。