东海区E2断面无机氮时空分布特征

The Distribution Features of Inorganic Nitrogen at the E2 Section of East China Sea

根据国家海洋局宁波海洋环境监测中心站1996-2010年在东海区E2断面监测得到的无机氮数据,描述近15年来E2断面夏、冬两个季节的无机氮总体变化情况,选取典型年份初步探讨该断面无机氮垂直分布特征,并对表层无机氮浓度作长时间序列分析并预测其变化趋势。主要结论:1)夏、冬季航次的无机氮浓度相对高值分别出现在1997年和2009年,无机氮浓度总体上冬季略高于夏季;2)无机氮垂直分布特征呈现一定的规律性,相同季节不同年份较为类似,不同季节之间则存在明显区别;3)从2013-2015年时间序列预测图可知,E2断面表层无机氮浓度表现为强烈的季节特征,即冬季明显高于夏季,冬、夏季无机氮浓度值均呈微微下降趋势。

Based on the inorganic nitrogen monitoring data of E2 section from 1996 to 2010 by Marine Environmental Monitoring Center of Ningbo, this paper describes the inorganic nitrogen general status of E2 section during the latest 15 years, discusses the vertical distribution of inorganic nitrogen, and does long time series analysis of surface inorganic nitrogen for trend prediction. The main results were as follows： Firstly, the highest inorganic nitrogen concentration of summer cruises appeared in 1997, while winter cruises in 2009, and the concentration of winter are higher than of summer. Secondly, the vertical distribution of the same seasonal features were same, and the different seasonal features were different. Thirdly, the surface concentration of inorganic nitrogen exhibited strong seasonal features in time series analysis, and the concentration of both winter and summer showed a slight descending trend.