王心怡¹, 刘子洲¹, 顾艳镇¹, 翟方国¹, 孙利元², 宋洪芳³, 李子牛⁴, 王兆宇⁴, 贾乃东⁴, 曲俐儒⁴
1.中国海洋大学 海洋与大气学院, 山东 青岛 266100;2.山东省水生生物资源养护管理中心, 山东 烟台 264000;3.辽宁省营口市海洋环境预报站, 辽宁 营口 115007;4.海洋环境预报与防灾减灾中心, 辽宁 沈阳 110014

摘要:
利用海底有缆在线观测系统获得的连续实时观测数据，研究了2016年6月2日至10月22日期间威海市西港海洋牧场底层海水溶解氧浓度的时间变化特征，并探讨了其影响机制。结果表明，观测期间底层海水溶解氧浓度整体呈先减小后增大的变化趋势，其变化范围为2.99 mg/L至11.43 mg/L，均值约为6.65 mg/L。进一步分析表明：（1）底层海水饱和溶解氧浓度的变化并不显著，于6月出现过饱和现象；（2）海水温度是底层海水溶解氧浓度日际变化和月变化的主要影响因素；（3）7月至8月中旬，在季节性温跃层抑制垂向混合和水温升高的共同影响下，底层溶解氧浓度总体呈下降趋势；（4）日平均风速与日平均海水溶解氧浓度的相关性并不显著，但大风期间底层海水溶解氧浓度存在先升高后降低的变化特征；（5）底层海水溶解氧浓度的日变化以全日周期为主，可能主要受生物过程、垂向混合扩散和潮流输运等日变化的影响。本研究对于进一步探讨山东半岛海洋牧场区域海水溶解氧的时空分布特征及其影响机制具有重要意义。
关键词:海洋牧场溶解氧浓度时间变化海水温度季节性温跃层
DOI：10.11759/hykx20190327001
分类号:P717
基金项目:国家自然科学基金项目（41576082，41476002，41776012）；国家重点研发计划项目（2017YFF0208403，2017YFF0208404）；山东省重点研发计划项目（2016ZDJS09A02）

Study on the temporal variation of bottom water dissolved oxygen concentration in the Xigang marine ranch
WANG Xin-yi¹, LIU Zi-zhou¹, GU Yan-zhen¹, ZHAI Fang-guo¹, SUN Li-yuan², SONG Hong-fang³, LI Zi-niu⁴, WANG Zhao-yu⁴, JIA Nai-dong⁴, QU Li-ru⁴
1.College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;2.Shandong Hydrobios Resources Conservation and Management Center, Yantai 264000, China;3.Marine Environment Forecast Station of Yingkou City, Yingkou 115007, China;4.Center for Marine Environmental Prediction&Disaster Prevention and Reduction of Liaoning Province, Shenyang 110014, China
Abstract:
Based on the continuous real-time observation data collected by the online observation system, the temporal variations of the bottom dissolved oxygen concentration during June 2nd, 2016 to October 22th, 2016 in the Xigang marine pasture are studied, and the influencing mechanisms are also discussed. The results show that the bottom dissolved oxygen concentration generally decreases first with time and then experiences a mild increase during the period, ranging from 2.99 mg/L to 11.43 mg/L with a mean value of 6.55 mg/L. Further analysis shows that:(1) The bottom saturated dissolved oxygen concentration does not vary significantly with time, with oversaturation events occurring in June; (2) The seawater temperature is the main factor affecting the daily and monthly variations of the bottom dissolved oxygen concentration; (3) The bottom dissolved oxygen concentration tends to decrease from July to Mid-August, due to the combined effects of the weak vertical turbulent mixing inhibited by the seasonal thermocline and the rising temperature; (4) Although the correlation of the daily mean dissolved oxygen with daily mean wind speed is not significant, it increases first and then decreases during the gale; (5) The diurnal variation of the bottom dissolved oxygen concentration is featured by the diurnal cycle, which may be mainly influenced by the diurnal variations of the biological processes, vertical mixing, tidal transport, and so on. This study is of great significance to further study the tempo-spatial distributions of the dissolved oxygen in the marine pasture area of Shandong Peninsula and their influencing mechanisms.
Key words:marine ranchdissolved oxygen concentrationtemporal variationseawater temperatureseasonal thermocline





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