东海北部海水中硝酸盐(NO_3-N)的分布及其成因

本文根据“中日黑潮合作调查”在东海的调查资料，探讨了硝酸盐的分布特征，以及水文条件对其分布的影响，并比较了不同年份夏季硝酸盐的分布差异及其原因。分析表明，表层海水中硝酸盐分布明显受长江冲淡水影响，陆架区测值高于外海，冬季测值高于夏季； ５０ｍ ，１００ｍ 层上陆架、黑潮锋区存在着硝酸盐锋面，黑潮主干的摆动可能是影响锋面位置的主要因素

The Nitrate Distribution and Its Formation in Seawater of the Northern East China Sea

Based on the investigated data collected in the East China Sea during the China Japan joint investigation on the Kuroshio, this paper discusses and analyzes the nitrate distribution feature and the effect of hydrologic process on the distribution. It also compares the differences in and the cause of formation for the nitrate distrbutions in summer in different years. The results indicate that the nitrate distribution in the surface water is affected obviously by the Changjiang River diluted water, the measured values of the coastal shelf area are higher than those in the open sea and those in winter higher than in summer. There are the nitrate fronts at the 50m and 100m layers around the shelf, and the Kuroshio front. It is probable that the swing of the Kuroshio current may be the main factor controlling the site of the front.