一种改进的Cressman插值方法在渤海表层总氮数据处理中的应用

A modified cressman interpolation method applied to process total nitrogen data in Bohai surface waters

摘要: 根据渤海常规监测站的站位分布特征，提出了一种用来处理渤海表层总氮数据的改进的Cressman插值（MCI）方法。由渤海常规监测总氮数据反应的污染状况设定污染物浓度的两种理想分布，通过理想实验发现利用MCI方法插值得到的误差比传统的Cressman方法、Kriging方法和Local Polynomial（LP）方法更小，验证了MCI方法的有效性。实际实验利用交叉验证方法来计算插值的误差，并用MCI方法插值出2009年和2010年共4个月份的表层总氮空间分布，为渤海污染状况分析提供较为准确的数据支持。

Abstract: A modified Cressman interpolation (MCI) method was proposed to study the total nitrogen (TN) data in Bohai surface waters, based on the distribution of Bohai routine monitoring stations.The pollution concentration station data features two idealized distributions.The twin experiments suggest reduced interpolation biases using MCI method, compared to the traditional Cressman, Kriging and Local Polynomial (LP) method.In practical experiments, cross validation scheme was applied to evaluate the interpolation biases.Bohai Surface TN concentration was recalculated following MCI method for four quarters in 2009 and 2010, providing an improved dataset for Bohai pollution investigation.