多因素对海洋上混合层深度影响的数值模拟

IOCAS-IR > 海洋环流与波动重点实验室

	多因素对海洋上混合层深度影响的数值模拟
其他题名	Numerical Simulation of the Ocean Surface Mixed Layer Depth Influenced by the Multi-factors
	范聪慧
学位类型	博士
	2007-06-11
学位授予单位	中国科学院海洋研究所
学位授予地点	海洋研究所
关键词	海洋上混合层深度多因素影响 Mitgcm模式遥感反演
摘要	海洋上混合层深度（MLD）是刻画海洋上混合层的一个非常重要的物理参量，MLD的准确确定对人们了解上层海洋动力学、热力学等具有重要的科学意义和实用价值。本文概述了影响MLD的几个主要因素，介绍了MLD的定义方法和主要的两类混合层模型。利用2001年月平均资料，分析了中国南海海表风应力、净热通量、蒸发、降雨及蒸降差的时、空分布变化规律。采用国外先进的MITgcm模式及考虑了非局地作用影响的KPP垂直混合模型，通过改变模式的上边界强迫条件，进行了海表风应力、海表净热通量、蒸降差对MLD影响的敏感性分析，结果表明MLD对海表风应力变化最为敏感。通过网格嵌套方法，采用MITgcm模式及分辨率为1/4°×1/4°的强迫场资料对南海进行数值模拟，分析了海表温度、盐度、流场及混合层深度的时、空分布特征变化规律，探讨了海表风应力、净热通量、蒸降差对海洋上混合层深度的影响。通过模拟结果与实测资料的比较，同时也表明MITgcm模式应用于中国南海区域范围的MLD数值模拟研究是可行的。基于考虑了地转和均匀背景流场影响的两层流体界面内波频散关系模型，得到一种新的利用SAR遥感图像反演混合层深度的方法。利用该方法对南海北部SAR内波图像进行了MLD的实例反演研究，并和时空同步的CTD资料进行了对比，结果表明考虑地转和均匀背景流场影响的MLD反演算法更为合理，为更准确地利用SAR图像遥感反演混合层深度奠定了基础。
其他摘要	The ocean surface mixed layer depth (MLD) is a very important physical parameter to describe the ocean surface mixed layer. MLD has important scientific significance and practical value for understanding of the upper ocean dynamics, thermodynamics, etc. Several major factors influencing MLD are analyzed in this paper. The definitions of the MLD are presented and a brief description of mixed layer models is given. The temporal and spatial characteristics of surface wind stress, net heat flux, evaporation, precipitation, and the difference between evaporation and precipitation (DEP) in the South China Sea (SCS) are analyzed by using monthly mean data in 2001. A foreign advanced numerical model MITgcm and a vertical mixing scheme KPP with a nonlocal boundary layer parameterization are employed. Several ideal numerical experiments are tested by modifying the existing sea surface boundary conditions. The sensitivity of the MLD simulation results influenced by surface wind stress, net heat flux and DEP is analyzed, it is shown that sea surface wind stress is the most sensitive parameters for MLD. The high resolution (1/4°×1/4°) numerical simulation in the SCS using MITgcm, grid nesting technique and several sea surface boundary conditions forced by the observational data is studied. The temporal and spatial characteristics of sea surface temperature, sea surface salinity, flow field and MLD are analyzed. The influences of the MLD by surface wind stress, net heat flux, and DEP are analyzed. Comparing the simulation result with observation data, the results suggest that MITgcm is applicable for studying MLD for SCS area. The new methods are presented to estimate the mixed-layer depth from SAR image based on the dispersion relationships obtained by using the two-layer fluid model of oceanic internal waves when the effects of Coriolis forces and steady uniform currents are considered. A internal solitary wave captured by the SAR image in the north South China Sea is analyzed by the proposed inversion methods, comparing the result with synchronized CTD data, it is shown that the models with the effect of Coriolis force and steady uniform currents are more reasonable.
页数	73
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/1459
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	范聪慧. 多因素对海洋上混合层深度影响的数值模拟[D]. 海洋研究所. 中国科学院海洋研究所,2007.

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