2007/2008年和2008/2009年夏季南大洋以及普里兹湾POC的分布与变化

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...

PARTICULATE ORGANIC CARBON IN THE SURFACE WATER OF SOUTH OCEAN AND PRYDZ BAY DURING THE AUSTRAL SUMMER OF 2007/2008 AND 2008/2009

Making use of surface water observations and Prydz Bay fixed point observation, the particulate organic carbon (POC) distribution and influencing factorswere 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 ubtropical and tropical water. During 2007/2008, the POC average concentrations of subtropical & tropicalwater, sub-Antarctic water and the Antarctic water were 116.59,105.85 and78.03 μg·dm^-3, is a bit higher than 9.36, 59.39 and 71.54 μg·dm^-3 in 2008/2009. The annual seasonal variation of POC in Southern Ocean surface wasinfluenced by many factors. The range of the concentration of POC respectively were 12.78-363.73 μg·dm^-3 and 24.38-446.40 μg·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 dis
tribution of POC was found at surface, while the maximum was at sub surface water outside the bay.