摘要
本文将波生运动和波湍相互作作用的参数化方案嵌入一维垂向混合模式GOTM中,并与不考虑波浪效应以及仅考虑波浪破碎的试验结果进行对比,发现不考虑波浪效应时,海表温度模拟结果偏高,混合层深度模拟结果偏浅,偏差在夏季尤其明显。波浪破碎对湍流的增强作用仅限于上层几米甚至仅限于表层,对整个混合层的温度分布和混合层深度影响不大。波生运动和波湍相互作用则有效增强海洋上层的湍流强度,改善模式高估海表温度而低估混合层深度的问题,温度分布模拟结果降低了上层温度同时增大了次表层温度,与观测更加相符。波生运动和波湍相互作用增大了海洋上层的湍流剪切生成项、湍动能、耗散率和湍流输运系数,两者对上混合层的温度分布、湍流强度和湍流输运作用的改善结果十分相似。波生运动和波湍相互作用的影响在冬季并不明显,此时可能有其他混合机制占主导地位。
Ocean models are always blamed for the overestimation of sea surface temperature and under-estimation of mixed layer depth due to insufficient mixing. For further understanding of the wave effects on turbulence of the upper ocean mixed layer, parameterizations of turbulence induced by wave orbital motion and wave-turbulence interaction are implemented in a 1-D vertical turbulence model GOTM. The influences of wave breaking（WB）, wave orbital motion（NWt3） and wave-turbulence interactions（WT） on the k-ω scheme and the upper ocean thermal structure are examined and compared with each other using the modified model. Model results show that while the effect of wave breaking is always limited in the very near-surface layer and is quite insufficient for enhancing mixing, the adding of production terms due to NWB and WT can greatly improve the simulated thermal structure, leading to a deepened mixed layer depth, enhanced shear production term, turbulent kinetic energy, dissipation rate and vertical mixing, as well as temperature distributions that are more consistent with the observations. In winter the inclusion of NWt3 and WT does not produce as idealized results as in summer, and the possible reason may be some other mechanics （e. g. lateral advection ） dominates the turbulent mixing process.
作者
朱冬琳
高劲松
管长龙
ZHU Donglin GAO Jingsong GUAN Changlong(College of Oceanic and Atmosphere Sciences, Ocean University of China, Qingdao 266100, China Guangxi Key Laboratory of Marine Environmental Science, Guangxi Academy of Sciences, Nanning 530007, China)
出处
《海洋湖沼通报》
CSCD
北大核心
2017年第1期1-13,共13页
Transactions of Oceanology and Limnology
基金
国家自然科学基金项目(41276010)
国家自然科学基金项目(41406044)资助
教育部博士点专项基金项目(20130132130002)
关键词
海洋上混合层
湍流
波生运动
波湍相互作用
GOTM模型
upper ocean mixed layer
turbulence
wave orbital motion
wave-turbulence interaction
GOTM
