渤、黄海在低氧形成期与消亡期生源要素的分布差异及响应特征

近年来，渤、黄海海域呈现溶解氧浓度降低并导致季节性低氧的特征，对海洋生态环境形成潜在危害。在此背景下，本文基于2011年6月（低氧形成期）和2011年11－12月初（低氧消亡期）在渤、黄海的观测数据，通过分析水体表观耗氧量（AOU）、pH、溶解无机碳（DIC）及营养盐之间的相关关系，探讨了生源要素在低氧形成期与消亡期的变化特征及主要控制机制。结果表明，生物的光合作用与有机物的降解过程是调控低氧事件前后渤海生源要素变化的主要因素之一，而黄海底层水体有机物的降解过程是调控水体溶解氧浓度及营养盐浓度变化的主要原因之一。

Dynamics of biogenic elements before and after oxygen depletion in Yellow and Bohai Seas

In recent years, the Bohai Sea and the Yellow Sea have shown the characteristics of decreasing dissolved oxygen concentration and leading to seasonal hypoxia, which will pose potential threats to coastal ecosystems. In this study, samples were collected from two cruises in summer (June 2011) and fall (November 2011) in Bohai and Yellow Seas, before and after the hypoxia and acidification events. For the ease of presentation, we defined the sampling periods as pre-oxygen decrease period and the post-oxygen decrease period, respectively. During the cruises, dissolved inorganic carbon (DIC), dissolved oxygen (DO) and dissolved inorganic nutrients were analyzed, and the controlling processes to the dynamics of carbonate parameters and nutrients were discussed. As a result: The photosynthesis and respiration are dominant factors controlling the changes of biogenic elements concentration in Bohai Sea during pre-oxygen and post-oxygen decreased period. In the Yellow Sea, the dominance of strong OM degradation in the Yellow Sea Cold Water in both cruises is primary reasons for the changes of nutrient and oxygen concentration.