Sub-Tropical Gyre Study: Anthropogenic Carbon and Biological Degradation in the Twilight Zone (Forschungsantrag M 60/5)

建议对北大西洋副热带环流水柱进行多学科调查，调查方向是沿着20世纪80年代初美国海洋-北大西洋调查（TTO-NAS）中的瞬变示踪剂最后占用的部分。连同2003年的次极地环流巡航（M。莱茵河），我们的巡航为国际（德国，美国，英国）重新占领TTO-NAS站做出了重要贡献。一个主要的目标是使用无机碳和化学示踪剂数据，以审查人为碳（Cant）在北大西洋的增加超过22年的时间间隔。这是Kieler Sonderforschungsbereich 460的Teilprojekt A5的目标。将使用多变量时间序列分析技术以及示踪剂-Cant相关性对数据进行评估，以量化人为碳增加。巡航的第二个目标是检查中层水柱内生物源物质的矿化，因为大多数成分是从真光层底部和ca之间的深度层位中的颗粒释放出来的。1.000米深。计划详细分析中远洋区的远洋生物群落，并进行实验以评估微粒分解率，以研究海水化过程。由于固氮作用被认为对这些沃茨中的营养物化学计量比有重大影响，固氮生物的固氮作用和生物多样性的研究也是这些调查的一部分。这些研究还将有助于审查有争议的建议（Pahlow和Riebesell，2001年），即北大西洋的营养物-氧化学计量一直在变化。

The proposed multidisciplinary investigation of the water column of the North Atlantic subtropical gyre is oriented along sections last occupied during the US Transient Tracers in the Ocean - North Atlantic Survey (TTO-NAS) of the early 1980's. Together with a sub-polar gyre cruise in 2003 (Prof. M. Rhein), our cruise provides a central contribution to an international (Germany, USA, UK) reoccupation of TTO-NAS stations. A major goal is to use inorganic carbon and chemical tracer data to examine the increase of anthropogenic carbon (Cant) in the North Atlantic over a time interval of 22 years. This is the goal of Teilprojekt A5 of the Kieler Sonderforschungsbereich 460. The data will be assessed using multivariate time-series analysis techniques as well as tracer-Cant correlations in order to quantify the anthropogenic carbon increase. A second goal of the cruise is the examination of remineralization of biogenic materials within the mesopelagic water column, since most constituents are being released from particles in the depth horizon between the base of the euphotic zone and ca. 1.000 m depth. Detailed analysis of the pelagic community in the mesopelagic zone and experiments to asses rates of particle breakdown are planned to examine the remineralization processes. Since nitrogen fixation is assumed to have a substantial influence on nutrient stoichiometric ratios in these waters dephts, studies of nitrogen fixation and biodiversity of diazotrophs are also part of these investigations. Such studies will also allow for examination of the controversial suggestion (Pahlow and Riebesell, 2001) that the nutrient-oxygen stoichiometry of the North Atlantic has been changing.