在中国第24次和第25次南极科学考察期间,利用航渡表层水观测和普里兹湾定点观测,对颗粒有机碳(POC)的分布及其影响因素进行了研究.结果表明,南大洋表层水体的颗粒有机碳分布具有明显的区域性特征,表层水体POC的含量与营养盐和叶绿素a有着明显的相关分布趋势.南极水、亚南极水的表层POC浓度明显高于亚热带水和热带水,第24次南极科学考察期间亚热带和热带水、亚南极水和南极水的表层POC平均浓度为78.03,116.59和105.8 μg·dm-3,要略高于第25次南极科学考察的49.36,59.39和71.54μg·dm-3,南大洋表层POC的年季变化,受多种因素的影响.第24次和第25次南极科学考察中普里兹湾及其邻近海域POC的浓度范围分别为12.78-363.73μg·dm-3和24.38-446.40μg·dm-3,表层分布主要表现出湾内高、湾外低的特点.湾内陆架区、陆坡区和湾外深水区的POC与Chl a都具有良好的正相关关系,相关系数R值分别为0.8248,0.8049和0.6989,说明POC主要来源于浮游生物的贡献.并且,在POC的垂直分布上,受到光照、营养盐及海流等各种因素的影响,在物理和生物的相互耦合作用,致使POC的最大值有从湾内的表层最大值向湾外的次表层最大值转变的趋势.%Making use of surface water observations and Prydz Bay fixed-point observation, the particulate organic carbon (POC) distribution and influencing 'factors were investigated during the austral summer of 2007/2008 and 2008/2009 (CHINARE-24 and CHINARE-25). As it turns out, the distribution of surface particulate organic carbon in the southern ocean water showed significant regional characteristics, the content of surface water POC trended strongly related distribution with nutrient and chlorophyll-a. The POC concentrations in surface water of Antarctic water and sub-Antarctic water were higher than subtropical and tropical water. During 2007/2008, the POC average concentrations of subtropical & tropical water,sub-Antarctic water and the Antarctic water were 116.59, 105. 85 and 78.03 μg · dm-3 , is a bit higher than 49.36, 59.39 and 71.54μg · dm-3 in 2008/2009. The annual seasonal variation of POC in Southern Ocean surface was influenced by many factors. The range of the concentration of POC respectively were 12.78-363.73μg · dm-3 and 24.38-446.40μg · dm-3 in Prydz Bay and its adjacent areas, in 2007/2008 and 2008/2009. The surface POC concentration decreased offshore. A high positive correlation between POC and chlorophyll-a was found in the shelf and slope area, also outside the Prydz Bay. The correlation coefficients in these waters were 0. 8248, 0. 8049 and 0. 6989, respectively, revealing that POC mainly comprised pelagic organisms. The vertical distribution of POC was influenced by light intensity, nutrients and currents, and the physical and biological coupling effect. In Prydz Bay, the maximum of vertical distribution of POC was found at surface, while the maximum was at sub-surface water outside the bay.
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