南海北部文石饱和度的分布及控制

基于2011年8月底和9月初对南海北部两个断面水文参数和碳酸盐参数的调查结果，探讨了南海北部文石饱和度（Ω_arag）的分布特征；并基于一个双端元混合模型，分析了上升流带来的物理混合和生物过程对Ω_arag的影响。结果表明:珠江口外A断面的近岸区域受到上升流影响，而海南岛外B断面则不受上升流影响且水体呈现明显的分层现象。A、B断面的Ω_arag范围分别在1.87~3.05和1.77~3.29之间，低值主要出现在A断面的近岸上升流区和B断面的深层水。基于一个双端元混合模型对A断面的分析，发现上升流带来的高CO₂水体涌升最大可使Ω_arag降低0.37，而近岸区好氧呼吸分解有机物释放的CO₂造成Ω_arag降低高达0.7，离岸区初级生产的发生则使Ω_arag最大升高了0.1。在海南岛外的B断面，深层水发生好氧呼吸释放CO₂是造成其Ω_arag偏低的主要原因。

Distribution and controls of aragonite saturation state in the Northern South China Sea

Based upon surveys conducted in August and September 2011, the distribution characteristics of aragonite saturation state (Ω_arag) were investigated in the Northern South China Sea.Based on a two end-member mixing model, the contributions to Ω_arag from two processes associated with upwelling:physical transport vs.biological production were analyzed.Results showed that transect A off the Pearl estuary was influenced by upwelling, while transect B off the Hainan Island was highly stratified.Ω_arag ranged from 1.87~3.05 along transect A and 1.77~3.29 along transect B.Low Ω_arag values primarily occurred in the upwelling area along transect A and deep water along transect B.Using a two end-member mixing model, we found that physical transport induced a Ω_arag decrease of up to 0.37.Aerobic respiration in the nearshore area caused Ω_arag to decrease by up to 0.7, while in the offshore area, biological production caused Ω_arag to increase by 0.1.In contrast, excess CO₂ derived from aerobic respiration in the deep water contributed to low Ω_arag along transect B.