本文關(guān)鍵詞： 西南黃海 三維結(jié)構(gòu) 冷水團(tuán) 渦動能 動能通量譜　出處：《中國科學(xué)院研究生院(海洋研究所)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：西南黃海靠近我國大陸,沿岸具有豐富的漁場和生物資源,但是從2007年開始的滸苔事件為我們敲響了警鐘。研究該海域的水文結(jié)構(gòu)和環(huán)流形態(tài)對于生態(tài)災(zāi)害預(yù)警和海洋漁業(yè)活動具有指導(dǎo)意義。本文利用ROMS模式輸出的水溫、流速數(shù)據(jù),首先探究了夏季西南黃海環(huán)流的三維結(jié)構(gòu),結(jié)果表明：江蘇外海的北向流受沿岸風(fēng)影響很大而且該流動的流幅和流量整體呈現(xiàn)隨著緯度增加而減小的趨勢；經(jīng)向流場具有為在六至八月海洋表層部分全部為淺而薄的北向流,九月幾乎整層深度均為南向流的垂向分布特征；北向流流核流向在春夏季向北、秋冬季向南,南向流流核幾乎全年向南流動。其次對西南黃海環(huán)流的影響因素進(jìn)行了討論,分析了南黃海冷水團(tuán)的生消過程,以及南黃海渦動場的季節(jié)性變化規(guī)律,并通過計算動能通量譜探討了相關(guān)的變化機(jī)理。得出以下主要結(jié)論：南黃海冷水團(tuán)是一個季節(jié)性水團(tuán),春季開始出現(xiàn),夏季達(dá)到鼎盛狀態(tài),秋季開始減弱,到冬季完全消失；位于南黃海東側(cè)的冷水團(tuán)相對比較穩(wěn)定,存在的深度較深,而南黃海西側(cè)的冷水團(tuán)存在時間較短,存在位置也較淺；夏季黃海冷水團(tuán)環(huán)流左支對江蘇外海處北向流的強(qiáng)度和結(jié)構(gòu)有著非常重要的影響。南黃海渦動能在季節(jié)變化尺度上存在雙峰結(jié)構(gòu),九月和一月各存在一個峰值,九月峰值較大,一月峰值較��；而且,上半年南黃海存在的渦主要為經(jīng)向伸長,下半年主要為緯向伸長；動能通量譜的計算結(jié)果顯示,九月存在的渦動能峰值主要是斜壓不穩(wěn)定過程直接作用的結(jié)果,而一月的峰值主要與渦渦相互作用相關(guān)。
[Abstract]:Southwest Huang Hai is close to the mainland of China, and there are abundant fishing grounds and biological resources along the coast. However, the events of Enteromorpha enteromorpha since 2007 have sounded the alarm bell for us. The study of hydrological structure and circulation pattern in this area is of guiding significance for ecological disaster warning and marine fishery activities. In this paper, we use the water temperature and velocity data output from ROMS model. Firstly, the three-dimensional structure of the southwestern Huang Hai circulation in summer is studied. The results show that the northward current in the offshore of Jiangsu is greatly affected by the coastal wind, and the flow amplitude and discharge decrease with the increase of latitude. The meridional current field is a shallow and thin northward current in the ocean surface from June to August, and almost the depth of the whole layer in September is the vertical distribution of the southward current, the northward flow core flows northward in spring and summer, and south in autumn and winter. The southward flow nuclei flow southward almost all year round. Secondly, the factors affecting the circulation of southwestern Huang Hai are discussed, and the process of occurrence and extinction of the South Huang Hai cold water mass and the seasonal variation law of the southern Huang Hai vortex field are analyzed. The main conclusions are as follows: the Southern Huang Hai cold water mass is a seasonal water mass, which begins to appear in spring, reaches its peak in summer, weakens in autumn and disappears completely in winter. The cold water mass located on the east side of South Huang Hai is relatively stable and deep, while the cold water mass on the west side of South Huang Hai is relatively short in time and shallow in location. In summer, the left branch of Huang Hai cold water mass circulation has a very important influence on the intensity and structure of the northward current off the coast of Jiangsu Province. The kinetic energy of the southern Huang Hai vortex has a bimodal structure on the scale of seasonal variation, one peak in September and one in January, and the peak value in September is larger. In January, the peak value was small, and the vortex in South Huang Hai was mainly meridional elongation in the first half of the year and latitudinal elongation in the second half of the year, and the kinetic energy flux spectrum was calculated. The peak of vorticity kinetic energy in September is mainly the result of direct interaction in baroclinic instability process, while the peak value in January is mainly related to vortex-interaction.
【學(xué)位授予單位】：中國科學(xué)院研究生院(海洋研究所)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P731.27
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本文編號：1527664