海底边界层溶解氧通量原位观测技术方法研究

Research on the In-Situ Observation Methods for Dissolved Oxygen Flux in the Benthic Boundary Layer

海底边界层是溶质和悬浮颗粒物在海床与水体间交换的重要场所,也是沉积物质的主要成岩作用区,对海洋、湖泊有着重要的生物、化学、地质学意义。底栖溶解氧消耗速率是评估早期碳矿化作用的重要指示剂,也是研究元素循环周转的重要指标。溶解氧通量原位监测技术是获取底栖溶解氧消耗速率、了解化学物质输运机制,进而研究底栖生态系统、环境污染影响、生物地球化学进程的重要手段。针对传统溶解氧观测方法在效率和准确度上的局限性,介绍了目前底边界层原位氧通量测量技术的发展现状,对包括底栖培养室、微电极剖面、涡动相关技术和平面光极系统在内的观测特点进行了对比分析,讨论了各自的不足与局限,提出了今后需要关注的改进方向。

The benthic boundary layer is the important region of intense transport of solutes and suspended particles and of diagenesis of deposited materials. This zone is of great significance to the study of the oceans, seas and lakes in terms of biology, chemistry, geology. The consumption rate of benthic dissolved oxygen is one of the important indicators of evaluatiing early mineralizing organic carbon. The dissolved oxygen also has strong influence on the cycling of elements. It is required to develop in-situ measurement of benthic dissolved oxygen flux to acquire consumption rates, to understand transport process mechanisms and to research the benthic ecosystem, pollution effects and biogeochemical process. Traditional dissolved oxygen measuring methods are limited in measurement due to low efficiency and accuracy. This report gives an overview of current state-of-the- art techniques used for benthic oxygen measurement. The characteristics and limits of benthic chamber, mierosensor profiler, eddy correlation and optode planar techniques are evaluated and contrasted to discuss the shortage and constraints of each obseving method, and to present future development directions.