【摘要】 沉积物-海水界面的溶解氧通量是研究水体环境内生物地球化学循环周转的重要指标。由于采样困难、仪器布放难度较大等原因,针对砾石海滩环境下的溶解氧通量研究还较少。本文通过非侵入性的涡动相关技术对青岛汇泉湾潮间带砾石基底的底栖溶解氧通量进行观测评估。结果表明,在一个涨潮期内溶解氧通量变换范围为-16.788 8±5.0+49.334 4±3.7 mmol O₂/m²/d。共谱分析表明,0.093～0.279 Hz间频带（从3.58到10.75 s）为其主要贡献频段,平均贡献占总光谱的50.19%。结果表明,随着潮汐进程的推进,主要贡献带逐渐向高频区域移动并达到稳定状态,可以推断波浪作用和破碎波作用分别主导着涨潮期前后底栖溶解氧通量的变化。此项研究也表明涡动相关技术可应用于近海潮间带底栖溶解氧观测,为研究海岸带生物地球化学进程研究提供了新的观测手段。更多还原

【Abstract】 The oxygen fluxe across the sediment-water interface(SWI) in coastal region is a key measure to fully understand the regulation of biogeochemical cycles in an aquatic environment. However, studies on fluxes of dissolved oxygen in gravel beach are limited,because of the difficulty in sample collection and instrumentations deployment. In this study, benthic oxygen fluxes across rocky substratum in an intertidal zone of Huiquan Bay was estimated by using noninvasive eddy correlation techniques. A total of 10 burst measurements were analyzed. The oxygen flux fluctuated from-5.788 8 ±2.6 to + 49.334 4 ±2.6 mmol O2 m-2/d were observed. The cospectra analysis showed that the oxygen flux at the frequency band between 0.093 and 0.279 Hz(at a period from 3.58 to 10.75 s)contributed 50.19% to the total spectrum on average. The results showed that the major contribution band moved to the high frequency region gradually and reached a steady state with increasing tidal flood. It is demonstrated that wave movement and wave breaking interaction resulted in the change of oxygen flux between gravel beach and shallow waters at the start and the end of a rising tide period, respectively. The eddy correlation techniques offer an efficient means for flux measurement over a gravel or mixed sand and gravel beaches.更多还原