本文關(guān)鍵詞： 混合 陸架海 觀測(cè) 參數(shù)化方案 瓊東　出處：《廣東海洋大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：湍流混合是海洋中重要的物理過(guò)程之一,對(duì)海洋中物質(zhì)的交換、能量的輸運(yùn)起著關(guān)鍵作用。陸架海是人類(lèi)生存和發(fā)展的重要海域,復(fù)雜的地形與豐富的動(dòng)力過(guò)程是控制和影響陸架�；旌系闹匾蛩亍１疚睦�2012年2月和7月冬夏兩季在海南島以東兩個(gè)航次的溫度、鹽度、流場(chǎng)和微尺度觀測(cè)資料,揭示了瓊東陸架海湍流混合的空間分布和季節(jié)變化特征,對(duì)比分析了不同混合參數(shù)化模型在該海域的適用情況,并提出了適用于瓊東陸架海的混合參數(shù)化模型。對(duì)觀測(cè)數(shù)據(jù)分析發(fā)現(xiàn)瓊東陸架海的混合具有明顯的季節(jié)變化特征,夏季瓊東陸架海的混合較弱,平均耗散率1×10-9-1,平均混合率1×10-62-1,低于大洋的背景值;冬季時(shí)混合增強(qiáng),平均耗散率1×10-8-1,平均混合率為1×10-42-1。夏季上升流使得等密線抬升,近海層結(jié)增強(qiáng),平均層結(jié)(N2)為3.2×10-4-2,而冬季時(shí)的平均層結(jié)(N2)僅有3.2×10-5-2,比夏季小了一個(gè)量級(jí)。層結(jié)的變化是影響瓊東陸架海混合冬強(qiáng)夏弱的重要因素�；趯咏Y(jié)和剪切數(shù)據(jù),利用Gregg1989(G89)、Kunze1990(K90)以及MacKinnon和Gregg2003(MG03)三種參數(shù)化模型對(duì)瓊東陸架海的混合率和耗散率進(jìn)行模擬,結(jié)果顯示G89和K90模型結(jié)果明顯比觀測(cè)值大1個(gè)量級(jí)以上,MG03模型與觀測(cè)值相對(duì)接近,另外,三種模型對(duì)冬季的模擬值與觀測(cè)值的偏差小于夏季時(shí)的偏差,說(shuō)明夏季上升流對(duì)混合機(jī)制有較大影響。針對(duì)夏季觀測(cè),我們提出夏季瓊東陸架�；旌系男聟�(shù)化方案為ε=10-6.3344?1.103?0.3008。關(guān)于瓊東陸架海湍流混合的機(jī)制以及參數(shù)化方案的改進(jìn)還需進(jìn)一步研究。
[Abstract]:Turbulence mixing is one of the important physical processes in the ocean, which plays a key role in the exchange of matter and energy transport in the ocean. Shelf sea is an important sea area for human survival and development. Complex topography and rich dynamic processes are important factors to control and influence the mixing of shelf and sea. In this paper, the temperature and salinity of two voyages east of Hainan Island in February 2012 and July are used. The characteristics of spatial distribution and seasonal variation of turbulent mixing in the eastern shelf sea of Qiongdong are revealed, and the applicability of different mixing parameterized models in the sea area is compared and analyzed. A mixed parameterized model suitable for the East Hainan Shelf Sea is proposed. The analysis of the observed data shows that the mixing of the East Jongdong Shelf Sea has obvious seasonal variation characteristics, and the mixing of the East Hainan Shelf Sea is weak in summer. The average dissipation rate is 1 脳 10-9-1 and the average mixing rate is 1 脳 10-62-1, which is lower than the background value of the ocean. The average dissipation rate is 1 脳 10 ~ (-8) -1 and the average mixing rate is 1 脳 10 ~ (-42-1) in winter. The average stratification N _ (2) is 3.2 脳 10 ~ (-4) ~ (-2), while in winter it is only 3.2 脳 10 ~ (-5) ~ (2). The variation of stratification is an important factor affecting the strong and weak winter in the east shelf sea. Based on stratification and shear data, Gregg1989 / G89 is used. Kunze 1990 K90) and MacKinnon and Gregg 2003 MG03) were used to simulate the mixing rate and dissipation rate of the East Hainan Shelf Sea. The results show that the results of G89 and K90 models are more than 1 order of magnitude larger than the observed values. The MG03 model is relatively close to the observed values. The deviation between the simulated and observed values of the three models in winter is smaller than that in summer, which indicates that the summer upwelling has a great influence on the mixing mechanism. We propose a new parameterization scheme for the sea mixing in the east shelf of Qiongdong in summer, which is 蔚 ~ (10) -6.3344? 1.103? 0.3008. The mechanism of turbulent mixing and the improvement of parameterization scheme need further study.
【學(xué)位授予單位】：廣東海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P714

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本文編號(hào)：1473159