Transport and budget of carbon, nutrients and oxygen in the North Atlantic
This thesis project is structured in five parts subdivided in eight chapters and four appendices, whose contents, results and main findings are briefly summarized below. Part I introduces the state of the art in the research field and sets the aim of the PhD thesis. It is subdivided in four chapters...
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| Format: | Doctoral or Postdoctoral Thesis |
| Language: | English |
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Universidad de Vigo
2018
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| Online Access: | https://archimer.ifremer.fr/doc/00853/96536/104935.pdf https://archimer.ifremer.fr/doc/00853/96536/ |
| Summary: | This thesis project is structured in five parts subdivided in eight chapters and four appendices, whose contents, results and main findings are briefly summarized below. Part I introduces the state of the art in the research field and sets the aim of the PhD thesis. It is subdivided in four chapters. This introductory part starts in the Chapter 1 with a general background of marine biogeochemical cycles, putting emphasis on the oceanic carbon cycle. The physical oceanography of the North Atlantic it is summarized in Chapter 2, with a detailed description of the eastern subpolar region that is the main area of study in this thesis. This chapter also address the large scale circulation in the Atlantic, the main mode of climate variability and the current state of knowledge about the subpolar water masses. In Chapter 3 the present concern about the implications of anthropogenic perturbations at geological scale is presented under the relatively new concept of Anthropocene, and chronology approaches in deep-sea sediments are suggested. At last, in Chapter 4 the main and specific objectives of this thesis are provided. From now on, each one of the subsequent parts of the thesis are related with specific objectives. With the exception of the introductory chapter in Part IV (Chapter 7), each chapter is designed as an independent entity, and structured in sections as a typical scientific publication. In Part II the organic component of the carbon cycle is addressed. After an introduction to the dissolved organic carbon (DOC) in the ocean carbon cycle, in the Chapter 5 is constructed a budget of DOC for the area of study combining water masses transports with source water type DOC characterizations. The budget is extended until subtropical latitudes (24ºN), where the implications of the Atlantic Meridional Overturning Circulation in the total exportation of DOC mediated by the Atlantic Ocean is evaluated for the first time. In Part III a complete biogeochemical budget for the region of study is applied. Chapter 6 update ... |
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