Controls on the air-sea balance of carbon dioxide
- 出版日期：2004.
- 页数：1 v. :
- 第一责任说明：Irina Marinov.
- 分类号：a226.5
- ISBN：0496150979(ebk.) :
MARC全文
02h0029528 20120629164944.0 cr un||||||||| 120621s2004 xx ||||f|||d||||||||eng | 3154544 0496150979(ebk.) : CNY371.35 NGL NGL NGL a226.5 Marinov, Irina. Controls on the air-sea balance of carbon dioxide [electronic resource] / Irina Marinov. 2004. 1 v. : digital, PDF file. Adviser: Gnanadesikan, Anand ; Sarmiento, Jorge. Thesis (Ph.D.)--Princeton University, 2004. Atmospheric pCO2 is set to a large degree by the oceanic carbon pumps, a combination of biological, physical and chemical processes which lead to the enrichment of inorganic carbon in the deep ocean. The present research suggests that carbon pumps are significantly modified if the large scale oceanic circulation, high latitude preformed nutrient concentration and the gas exchange rate change. Nutrients are present in the ocean in two separate forms: preformed and remineralized. The net preformed nutrient concentration of the deep ocean is a function of the relative contributions of Antarctic Bottom Water and North Atlantic Deep Water to the deep and the initial preformed nutrient concentration of these source waters. Changes in oceanic circulation and depletion of high latitude nutrients impact strongly the deep ocean preformed concentration, forcing remineralized nutrients to change in such a way as to conserve the total nutrient pool. In turn, the amount of remineralization in the ocean is primarily responsible for setting the soft tissue pump strength and the oceanic uptake of CO2. Therefore, the soft tissue pump strength and CO2 sequestration in the deep ocean are controlled almost completely by the factors that control preformed nutrients. In agreement with previous studies I show that the Southern Ocean is crucial in controlling the atmosphere-ocean balance of carbon dioxide as well as global biological production. The large-scale pattern of circulation in the Southern Ocean involves upwelling of deep water, some of which flows to the south to sink as bottom water, and some of which flows to the north to form intermediate and mode waters. This work shows that the air-sea balance of carbon dioxide is controlled primarily by the biological pump and circulation in the deep-water formation Antarctic) region and particularly in highly convective areas such as the Weddell Sea, whereas global biological productivity is controlled primarily by the biological pump and circulation in the intermediate and mode water formation Subantarctic) region. This implies that it may be possible for climate change or human intervention to modify one of these without greatly altering the other. Ocean-atmosphere interaction. Electronic dissertations. aeBook. aCN bNGL http://pqdt.bjzhongke.com.cn/Detail.aspx?pid=ZMis1vwlmj4%3d NGL Bs1584 rCNY371.35 ; h1 bs1204