南黄海和东海表层水两种粒级颗粒物和颗粒氮含量的分布特征

测定了南黄海和东海表层水0.7~53.0μm和〉53.0μm这2种悬浮颗粒物（SPM）、颗粒氮（PN）的含量.其结果表明,南黄海和东海表层水0.7~53.0μm粒级的SPM、PN平均含量分别为4.68 mg/dm3、18.50μg/dm3;而〉53.0μm粒级的SPM、PN平均含量分别为0.20 mg/dm3、2.65μg/dm3.0.7~53.0μm和〉53.0μm粒级的PN/SPM含量平均比值分别为0.78%、1.41%（m/m）,后者约是前者的2倍.统计分析结果表明,尽管这2种粒级的SPM、PN含量和PN/SPM含量比值的范围较大,但约80%的数据集中在较小范围内,即0.7~53.0μm和〉53.0μm粒级SPM含量分别集中在0.37~3.68、0.02~0.29 mg/dm3的范围内;0.7~53.0μm和〉53.0μm粒级PN含量分别集中在2.54~18.90、0.40~2.69μg/dm3的范围内;0.7~53.0μm和〉53.0μm粒级的PN/SPM含量比值分别集中在0.14%~1.00%和0.15%~1.95%之间.研究结果表明,研究海域0.7~53.0μm粒级SPM、PN含量有2个高值区,分别位于近岸海区和东海东北部海区.〉53.0μm粒级SPM、PN含量的分布分为2个部分：南黄海表层水SPM、PN含量分布呈从近岸向外海降低的趋势;而东海表层水SPM、PN含量分布呈断面中间高,并分别向近岸和外海降低的趋势.

Distribution characteristics of particulate matter contents and particulate nitrogen contents for two grain-sizes in surface seawater in the southern Yellow Sea and the East China Sea

The contents of suspended particulate matter（SPM） and particulate nitrogen（PN） for two grain-sizes,0.7～53.0 μm and 53.0 μm,in the surface seawaters of the southern Yellow Sea and the East China Sea were measured.For the grain-size of 0.7～53.0 μm,the SPM content was 4.68 mg/dm3,while that of PN contents was 18.5 μg/dm3.For the grain-size of 53.0 μm,the SPM and PN contents were 0.204 mg/dm3 and 2.65 μg/dm3,respectively.The PN/SPM content ratios for the grain-size of 53.0 μm and 0.7～53.0 μm were 1.41% and 0.78%（m/m）,respectively.Statistically,the ranges of the SPM,PN and PN/SPM content ratio of the two grain-sizes were large,but about 80% of the data were within a small range.The ranges of SPM contents for the grain-size of 0.7~53.0 μm and 53.0 μm were 0.37~3.68 mg/dm3 and 0.02~0.29 mg/dm3.The range of PN contents for the grain-size of 0.7～53.0 μm and 53.0 μm were 2.54~18.90 μg/dm3 and 0.40~2.69 μg/dm3.The ranges of the PN/SPM content ratio for the grain-size of 0.7～53.0 μm and 53.0 μm were 0.14%~1.00% and 0.15%~1.95%,respectively.Finally,the results showed that the content of SPM and PN for the 0.7～53 μm grain-size had two high value areas at the coastal and the northeastern East China Sea.The high SPM and PN content areas for the 53.0 μm grain-size were found in the coastal waters in the southern Yellow Sea,while the high SPM and PN content areas in the East China Sea were found in the outer side of the coastal waters.