Spatiotemporal assessment of marine environmental monitoring programme based on DIN concentration in the Yangtze River estuary and its adjacent sea
Spatiotemporal assessment of marine environmental monitoring programme based on DIN concentration in the Yangtze River estuary and its adjacent sea
复制标题
基于长江口及邻近海域DIN浓度的海洋环境监测方案时空评估
DOI：
10.1016/j.scitotenv.2019.135527
复制
发表时间：
2020
影响因子：
9.8
通讯作者：
Jinfeng Wang
中科院分区：
文献类型：
--
作者：
Haimei Fan;Jiaxin Wang;Maogui Hu;Zhien Li;Xiaoshan Jiang;Jinfeng Wang
长江口及其邻近海域的海洋环境得到严格保护，常规监测水平不断提高。因此，需要科学和有效的监测方案。氮是长江流域最严重的污染物之一。准确获取水质等级污染区域是一个科学和管理问题，需要优化监测程序和插值方法。基于非均匀表面时空回归点均值（STR-PMSN），估算了层状非均质河口溶解无机氮（DIN）浓度。采用插值法对1、2级DIN的年平均面积进行了划分；2月、5月、8月和11月分别为3145 km2、1626 km2、2320 km2和3758 km2。这意味着11月的水条件最好，而5月最差。与此同时，DIN面积变化表明，8月和5月因数据去除而导致的水情变化要比2月和11月大得多。重要性由高到低依次为8月、5月、2月和11月。每个月代表不同的径流期。监测频率不应降低。去除第三层的采样数据对该区域产生了重大影响。当去除第三层外边界网格的采样数据时，水条件变得更差。然而，当去除内边界网格的采样数据后，水状况有所改善。为了避免插值失稳，降低现有测点的灵敏度，应在外边界区域增加新的测点。本研究评估了STR-PMSN对海洋环境监测方案对污染物分布的时空影响，为长江三角洲及其邻近海域更精确的数据采集和处理方法提供指导。
The marine environment is rigorously protected in the Yangtze River Estuary (YRE) and its adjacent sea, and routine monitoring is constantly upgraded. Therefore, scientific and efficient monitoring programmes are needed. Nitrogen is one of the most serious pollutants in the YRE. Obtaining the precise pollution areas of water quality grades (WQGs) are a scientific and management issue that requires optimization of monitoring programmes and interpolation methods. Based on spatiotemporal regression point means of surface with non-homogeneity (STR-PMSN), dissolved inorganic nitrogen (DIN) concentrations were estimated in a stratified heterogeneous estuary. The annual average areas of DIN Grades I and II were classified by interpolating the concentrations; the values were 3145 km2, 1626 km2, 2320 km2and 3758 km2for February, May, August and November, respectively. This means that November had the best water condition, and May had the worst. Meanwhile, DIN area changes showed that the water condition changed due to removal of data much more in August and May than in February and November. The descending order of importance was August, May, February and November. Every month represented different runoff periods. Monitoring frequency should not be reduced. Removal of sampling data for the third stratum had a significant effect on the area. When the sampling data for outer boundary meshes of the third stratum were removed, the water condition became worse. However, when the sampling data for inner boundary meshes were removed, the water condition improved. New sites should be added to the outer boundary region to avoid interpolation instability and reduce the sensitivity of the existing sites. This study assesses the spatiotemporal effect of the marine environmental monitoring programmes on pollutant distribution by STR-PMSN, and it offers guidance for more precise data acquisition and processing methods in the YRE and its adjacent sea.