南极春季海冰物理对叶绿素控制作用的统计分析

利用2006年南极威德尔海西北海域冬末春初的冰芯晶体结构,和302组冰芯温度、盐度、密度、叶绿素-a、脱镁叶绿素数据,以及冰底面叶绿素a垂直分布数据,进一步确定积雪/海冰厚度、冰内温度、盐度、密度对冰内和冰下叶绿素a的贡献.利用环境制约与生态平衡原理,阐明积雪/海冰厚度通过阻碍光通量对冰底叶绿素的效应,以及卤水体积通过冰温度和盐度体现对冰藻细胞活性的抑制作用.统计分析不仅确立了南极海冰冰内卤水体积-内叶绿素a的逻辑斯蒂上限含量曲线,并体现出粒状冰同柱状冰卤水排泄方式的差异及其对冰底春季叶绿素a快速增长的冰物理贡献.冰藻细胞活性指标小于0.5的仅占4.3%,该数据为南极冰藻是维持南极冰区浮游植物旺发的主导因子提供了重要依据.

Statistical analysis of sea ice physical conditions effect on chlorophyll during the austral spring in Antarctica

The sea ice core texture, and 302 groups of ice core temperature, salinity, density, chlorophyll a (Chl-a) as well as phaeophytin, Chl-a under ice from Northern West of Weddell Sea, Antarctica during the period between winter and spring of 2006 were statistically analyzed. The contributions of snow/ice thickness, ice temperature, ice salinity and ice density to the Chl-a content in ice and Chl-a blooms under ice were determined. The snow/ice thickness effect on the Chl-a blooms under the ice due to light absorption was determined. The relationship between the activity of ice algae cells and brine volume (function of ice temperature and ice salinity) in ice was investigated following the principle of environment control on the ecological balance. The statistical analysis not only revealed the relationship between the upper limits of Chl-a and brine volume in Logistic model, but also showed that granular and columnar ice crystals affect the brine drainage. The 4.3% of the index of active algal cells less than 0.5showed that the physical properties of sea ice not only affect the Chl-a blooms near ice bottom and at the ice-water interface in the austral Spring, but also are a key control element modulating the marine phytoplankton bloom in the ice covered waters around Antarctica.