Study of sea surface temperature fronts around the Taiwan Strait

本文提出一种经改进的基于数学形态学的多尺度、多结构元素、自适应加权的边缘检测方法，该方法能够兼顾大尺度锋面及中、小尺度锋面的检测，并具有很强的抗噪性。通过将该方法应用于高分辨率、长时间序列的遥感海表温度资料，并佐以实测海表温度资料进行分析，本文研究了台湾海峡及其周边海域存在的海表温度锋的季节、月及月内短周期变化规律。经分析，本文共得出以下主要结论： （1）遥感资料分析表明，研究区域内主要存在台湾浅滩锋、浙闽沿岸流锋、彰云海脊锋和东海黑潮锋。 （2）受太阳辐射、季风等因素影响，研究海区内海表温度锋存在明显的季节变化，普遍具有冬、春季节强而夏、秋季节弱的特点，冬、春季节锋面的强度和宽度往往大于...A morphology-based edge detection method is used to study the sea surface temperature （SST） fronts around the Taiwan Strait. The method is based on mathematical morphology, using multi-dimension and multi-structure elements. With this strong anti-noise method, we can distinguish the large thermal fronts as well as the smaller ones. Then we used this method as well as routine method in high resolut...学位：理学硕士院系专业：海洋与环境学院海洋学系_物理海洋学学号：2242006115228

改进型边缘检测技术在台湾海峡及其周边海域海表温度锋研究中的应用

利用基于数学形态学的多尺度、多结构元素、自适应加权的边缘检测技术,对2002年9月至2008年8月共6年的海表温度(SST)卫星遥感数据进行分析,得出台湾海峡及其周边海域上的主要锋面位置及其季节、月变化规律.检测结果表明,在研究海区共存在4个比较稳定的海表温度锋:台湾浅滩锋、浙闽沿岸锋、彰云海脊锋和东海陆坡黑潮锋.锋面强度及范围呈冬强夏弱的特点.1~5月份往往是锋面的活跃期,7~10月份普遍为锋面消亡期.国家自然科学基金项目(批准号:40576015;40821063;40810069004);国家重点基础研究发展计划(编号:20097CB411803)资

Distribution Characteristics of Sea Surface Salinity and Its Relations to Tide in Jiulongjiang Estuary-Xiamen Bay

根据2006~2007年九龙江口-厦门湾海域5个航次的调查结果,分析该海域表层盐度的分布特征及其随潮时的变化.结果表明:河口区,表层盐度分布随潮变化;因受外海高盐水和九龙江冲淡水影响的不同,高潮前1~2 h,河口海域表层盐度北部随时间降低,而南部则随时间略有升高;厦门湾海域存在明显的冲淡水锋面,其位置及强度也随潮变化.According to 5 cruises of observations in the Jiulongjiang Estuary-Xiamen Bay during 2006 and 2007,we analyzed the distribution characteristics of sea surface salinity as well as its variability with tide.The results showed that the sea surface salinity varied with tide in the estuary.Due to the different influence of oceanic water with higher salinity and fresh water from the Jiulongjiang River,the salinity in the southern estuary increased with time at 1～2 hours before high tide.However,the salinity decreased with tide in the northern estuary.Obvious plume fronts were detected in the Xiamen Bay,and their location and strength varied with tide.国家自然科学基金项目(40576015)资

Densely Underway Measurement of Surface Temperature and Salinity in Xiamen-Quanzhou Near-shore Area

根据2007年7月23~28日厦门—泉州近岸海域表层温、盐度31个密集断面走航观测结果,结合同期卫星遥感海表温度(SST)数据和潮汐资料,分析该海域表层温、盐度的分布,并采用非等间隔数据的谱分析方法研究温、盐度的变化特征。结果表明:1九龙江冲淡水的影响可延伸到围头、深沪近岸海域,表现为明显的表层盐度锋存在;但晋江冲淡水对调查海域的影响较弱。2在该调查海域,潮汐对表层温、盐度的分布和变化有一定的影响,靠近厦门湾口一端的围头、深沪附近海域尤为突出。谱分析结果显示,该段的盐度变化与潮汐涨落在周期上比较一致。3调查期间,表层温度变化呈逐渐升高的趋势,而且具有明显的周日变化特征。4围头近岸表层存在一个低温高盐水区域,且位置随潮汐有所变动。The distributions of surface temperature and salinity have been analyzed according to the sea surface temperature and salinity underway measurements along 31 transects in Xiamen-Quanzhou near-shore area in late July of 2007,combined with the remote sensing sea surface temperature data and tide data.The variational characteristics of temperature and salinity were analyzed through spectral analysis of unevenly sample data.The results show that: ①The influence area of the diluted water from the Jiulongjiang river can extend to near-shore area of Weitou and Shenhu.There exist strong temperature and salinity fronts.But the influence of the diluted water from the Jinjiang river is weak.In the research area,tide has some effects on the distribution and variation of sea surface temperature and salinity,especially near Xiamen bay and in near-shore area of Weitou and Shenhu.The spectral analysis result also shows that the variation of salinity coincides with that of tide.③During the investigational period,sea surface temperature had an increasing trend accompanied with diurnal variation.④There exists a low temperature and high salinity water near Weitou,and its location changes with tide.国家自然科学基金项目“台湾海峡西部海区夏季多锋结构时空变异性的研究”(编号:40576015);“九龙江流域—河口—近海系统耦合变动及环境生态效应”(编号:40810069004);国家重点基础研究发展计划项目“中国近海碳收支、调控机理及生态效应研究”(编号:2009CB421208)资

An analysis on temperature and salinity at the surface water of Fujian coast in late August of 2006

通过对福建沿海2006年8月20~24日表层温、盐度的调查资料进行分析,得出以下结果:(1)受九龙江、晋江以及闽江冲淡水的影响,福建沿海存在较强的河口锋.(2)在东山、平潭附近海域存在上升流迹象.(3)在沿岸区,潮汐对海水表层温、盐分布的影响显著.Several phenomena are analyzed according to the temperature and salinity measurements at surface water along the Fujian coast in late August of 2006.The results show that:(1)As affected by the diluted water from the Jiulongjiang River,Jinjiang River and Minjiang River,there exist strong salinity fronts in the estuaries.(2)Upwelling are evident near both Dongshan and Pingtan.(3)Tide has shown effects on the sea surface temperature and salinity along Fujian coast.国家自然科学基金资助项目(40576015、40521003、40331004