摘要
根据 2 0 0 1年夏季胶州湾连续站观测资料 ,从分析潮汐、潮流特征和温度、盐度变化趋势入手 ,计算了湍动能耗散率和密度扩散系数。借助调和分析、谱分析、线性回归和经验正交分析方法 ,得到各观测要素的统计特征 ,并讨论其成因。研究表明 ,胶州湾以半日潮振荡占优 ,水平潮流表现为往复流的形式 ;由于观测前台风过境 ,降水骤增 ,径流量变大 ,温度、盐度层化显著 ,并伴随湾内与外海水交换的进行 ,温 /盐与潮位分别表现为显著的负 /正相关 ,盐度逐日升高并趋于新的平衡 ;湍动能耗散率和密度扩散系数的量级分别为 10 -5w·m-3 和 10 -6m2 ·s-1 ,受强潮流剪切影响该值明显高于陆架边缘海域 ,其空间主要模态表现为表层小、底层大 ,相应时间系数存在大约 6h的显著周期。
By using the methods of harmonic analysis, power spectrum analysis, linear regression and EOF, the intensive observation data of hydrographic factors in Jiaozhou Bay are analyzed; also calculated are turbulent kinematic dissipation rate and density diffusivity. Jiaozhou Bay is dominated by semidiurnal tidal components with tidal currents flowing back and forth. The rainstorm before the observation causes strong thermohaline stratification. Due to the tidal water exchange with the Yellow Sea, the temperature/salinity appears to be in/out of phase with the tidal elevation. The orders of magnitude of the turbulent kinematic dissipation rate and density diffusivity are 10 -5w·m -3 and 10 -6 m2·s -1, respectively, with their first mode eigenvectors being characterized by increase with depth and corresponding time coefficients having a significant 6-hour period.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第5期737-741,共5页
Periodical of Ocean University of China
基金
国家自然科学基金项目 (40 0 360 1 0 )资助
