本文選題：海洋碳循環(huán) + 顆粒有機碳��； 參考：《成都信息工程學院》2015年碩士論文

【摘要】：海洋中顆粒有機碳(POC)的垂直輸送與降解在海洋碳循環(huán)中是很重要的環(huán)節(jié),它能迅速將上層海洋吸收的碳轉(zhuǎn)移到深海,對海洋吸收和調(diào)節(jié)大氣CO2起到了重大作用。本文研究主要包括兩個方面的內(nèi)容:一方面是對LICOM海洋環(huán)流模式中GM90次網(wǎng)格參數(shù)化進行改進,并用被動示蹤物CFC-11檢驗模擬結(jié)果;另一方面是使用與LICOM模式耦合的簡單生物地球化學模式IAP-OBM,增加IAP-OBM模式對顆粒有機碳的預報,完善該模式的有機碳庫種類和碳循環(huán)過程,并研究分析中尺度渦旋參數(shù)化方案和顆粒有機碳對碳循環(huán)過程的影響。主要包括以下結(jié)論:1)對LICOM模式中尺度渦旋參數(shù)化方案(GM90方案)中渦度擴散系數(shù)rA對物理場及CFC-11分布的影響進行了研究。做了兩個試驗,模擬結(jié)果表明,采用在非絕熱層以下rA隨海洋浮力頻率N2垂直變化的參數(shù)化方案(浮力試驗)對模式物理場的模擬能力有一定程度的提升,如南極繞極流的輸送強度比常系數(shù)方案增大了約20%~30%,與觀測事實更接近;浮力試驗對控制試驗中過強的南極中層水有一定的削弱作用,使得模式對南大洋高緯次表層位密度的模擬有一定的改善。通過對CFC-11分布、存儲以及輸送的研究發(fā)現(xiàn),次網(wǎng)格參數(shù)取值的不同對南大洋CFC-11模擬情況有較大影響。浮力試驗加大了南北高緯CFC-11海表的吸收通量,對南極大陸周邊海域向南大洋主儲藏區(qū)的CFC-11輸送能力有一定的增強,使得南大洋對CFC-11儲藏量增大,大部分海區(qū)與觀測資料更接近。通過CFC-11斷面分析,浮力試驗對南大洋上層海洋位密度模擬的改善使得CFC-11垂直結(jié)構(gòu)與觀測更接近。2)使用簡單生物地球化學IAP-OBM模式,增加模式顆粒有機碳為預報變量,并設(shè)計了三個試驗,研究了中尺度渦旋參數(shù)化采用浮力方案為背景的物理場下對碳循環(huán)的影響,以及在相同物理場下增加顆粒有機碳為預報變量后的不同碳循環(huán)過程的模擬差異。模擬結(jié)果表明,三個試驗均能很好地模擬出海表的磷酸鹽、總堿度以及總?cè)芙鉄o機碳的分布特征。采用浮力方案為背景物理場的試驗對南大洋深海和赤道附近800-1000m左右的模擬有一定影響,但整體對模式生化變量的模擬差異并不明顯。新的碳循環(huán)方案對南大洋海表磷酸鹽的模擬有一定程度的增加,與觀測更貼近。在垂直結(jié)構(gòu)上,新的碳循環(huán)方案對磷酸鹽、總堿度的模擬有較為明顯的改善,但對深�？�?cè)芙鉄o機碳的模擬有所偏弱。
[Abstract]:The vertical transport and degradation of particulate organic carbon (POC) in the ocean is an important part of the marine carbon cycle. It can transfer the carbon absorbed by the upper ocean quickly to the deep sea, which plays an important role in the absorption and regulation of atmospheric CO2 by the ocean. This paper mainly includes two aspects: on the one hand, we improve the GM90 subgrid parameterization in the LICOM ocean circulation model, and test the simulation results with the passive tracer CFC-11; On the other hand, a simple biogeochemical model (IAP-OBM) coupled with LICOM model is used to increase the prediction of particulate organic carbon by IAP-OBM model, and to improve the organic carbon pool types and carbon cycle process of the model. The effects of mesoscale vortex parameterization scheme and particulate organic carbon on the carbon cycle are studied. The main conclusions are as follows: (1) the effects of vorticity diffusion coefficient (RA) on physical field and CFC-11 distribution in LICOM model are studied in the mesoscale vortex parameterization scheme (GM90 scheme). Two experiments have been done. The simulation results show that the parameterized scheme (buoyancy test) with the vertical variation of ocean buoyancy frequency N2 below the non-adiabatic layer can improve the simulation ability of the model physical field to a certain extent. For example, the transport intensity of the Antarctic circumpolar current is increased by about 20% compared with the constant coefficient scheme, which is closer to the observed fact, and the buoyancy test has a certain weakening effect on the control of the excessive middle Antarctic water in the experiment. The model improves the simulation of the subsurface potential density of the Southern Ocean in high latitudes. Through the study of CFC-11 distribution, storage and transportation, it is found that the different values of subgrid parameters have great influence on the simulation of Southern Ocean CFC-11. The buoyancy test increases the absorption flux of the surface of the CFC-11 sea surface at high latitudes in the north and the south, and enhances the transport capacity of CFC-11 from the circumjacent waters of the Antarctic continent to the main storage area of the Southern Ocean to a certain extent, which makes the storage of CFC-11 in the Southern Ocean increase, and most of the sea areas are closer to the observational data. Based on the CFC-11 section analysis, the improvement of buoyancy test to the simulation of the oceanic potential density in the Southern Ocean makes the vertical structure of CFC-11 closer to the observation. 2) A simple biogeochemical IAP-OBM model is used, and the model particle organic carbon is added as the prediction variable. Three experiments were designed to study the effect of mesoscale vortex parameterization under the background of buoyancy scheme on the carbon cycle. At the same physical field, the simulation differences of different carbon cycle processes with the addition of particulate organic carbon as predictive variables are also discussed. The simulation results show that the three experiments can well simulate the distribution characteristics of phosphate, total alkalinity and total dissolved inorganic carbon on the sea surface. The experiments using the buoyancy scheme as the background physical field have certain influence on the simulation of the deep sea and near the equator about 800-1000m, but there is no obvious difference in the simulation of the model biochemical variables as a whole. The new carbon cycle scheme increases the simulation of surface phosphate in the Southern Ocean Sea to a certain extent and is closer to the observation. In vertical structure, the simulation of total basicity of phosphate and total alkalinity is improved obviously by the new carbon cycle scheme, but the simulation of total dissolved inorganic carbon in deep sea is weak.
【學位授予單位】：成都信息工程學院
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P734

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本文編號：1818517