中文摘要：

在2003年10月广东沿岸航次和2004年9月南海北部开放航次数据的基础上，分析了南海北部水体非藻类颗粒物吸收系数（αNAP（λ））的变化。结果显示，沿岸水体的非藻类颗粒物吸收光谱斜率（SNAP）平均值为0．0103nm^-1（标准偏差=0．0007nm^-1），随叶绿素a浓度的增大呈现出减小的趋势，南海北部开阔海域水体SNAP，的平均值为0．0090nm^-1（标准偏差=0．0013nm^-1）；沿岸水体受陆源性输入的影响较大，表层水体αNAP（440）随盐度的增大而减小，随总悬浮颗粒物（SPM）浓度的增大而增大，αNAP（440）／SPM平均为0．045m^2·g^-1；南海北部开阔海域水体非藻类颗粒物的吸收明显偏小，表层水体的αNAP（440）与盐度存在较弱的线性相关，与SPM之间没有表现出明显的相关性，αNAP（440）与叶绿素a浓度之间存在一定的幂指数关系，表明外海水体浮游植物的降解是非藻类颗粒物的主要来源之一。

英文摘要：

Light absorption coefficients of non-algal particles were measured during cruises along the coast of Guangdong province （CWGD） on October 2003 and in the northern part of the South China Sea （NSCS） on September 2004. The non-algal particulate absorption follows an exponential function with wavelength, and the averaged spectra slope （SNAP） is 0. 010 3 nm^-1 （Sd： 0. 000 7 nm^-1） for CWGD cruise and 0. 009 0 nm^-1 （Sd： 0. 001 3 nm^-1） for NSCS cruise, and for CWGD waters the SNAP tends to decrease with the increasing of chlorophyll a concentration. Because of the effect of river discharge, the non-algal particulate absorption for the surface waters of CWGD cruise tends to decrease with the increasing of salinity, which also has a good positive linear relationship with the concentrations of suspended particulate matter （SPM）, with the averaged vahie of αNAP （440） /SPM is 0. 045 m^2·g^-1. The non-algal particulate absorption of the NSCS cruise, is apparently lower than that of the CWGD cruise, and for surface waters the αNAP （440） has the weakly linear relationship with salinity, and there is no distinct trend between it and SPM ; meanwhile, there is a general power function relationship between αNAP （440） and chlorophyll a concentration, which shows that in fthe open ocean waters, the degradation of phytoplankton is one of the important sources of non-algal particles.