受蔡明刚教授邀请，德国基尔亥姆霍兹海洋研究中心（GEOMAR, Helmholtz Center for Ocean Research Kiel) Toste Tanhua高级研究员将于10月26号来厦门交流访问，并做学术报告，详情如下：
报告题目：Observing the Oceans for climate and ocean health, why transient tracers matters
报告人： Toste Tanhua（GEOMAR, Helmholtz Center for Ocean Research Kiel)
报告地点：周隆泉楼A3-206报告厅
报告时间：10月28日（星期五）10:00-11:00
报告结束后，蔡老师也邀请有兴趣的老师留下来参加讨论和座谈，地点在周隆泉楼B3-201，时间为11:00-12:00.
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个人简历:
Toste Tanhua，德国基尔亥姆霍兹基尔海洋研究中心，高级研究员/GEOMAR, Helmholtz Centre for Ocean Research Kiel, Germany, Senior Scientist。 GEOMAR是国际上在海洋科学研究领域处于领先的研究所之一，其重点关注海底、大洋和大洋边缘的化学，物理，生物以及地质过程及其同大气的相互作用。Dr. Toste Tanhua领导的瞬态示踪研究组（Workgroup: Transient Tracers）是世界上开展瞬态示踪物的研究较早的验室之一，在诸如CFC-12和SF6等海洋瞬态示踪物的测定技术方面具于领先水平。GEOMAR拥有长期、丰富的海上现场工作和科学研究经验，在利用多种瞬态示踪物开展海洋水团平均年龄的估算、人为碳浓度估算、海洋通风和混合过程等海洋科学研究等领域方面获得了丰富的成果。此外，也开展了释放示踪物实验研究，从而获得示踪物大范围运输的水平、垂直混合速率。
报告摘要：
Transient tracers are a group of (chemical) compounds that can be used in the ocean to quantify ventilation, transit time distribution and transport time-scales. These compounds are all conservative in sea-water, or have well-defined decay-functions, and a well-established source function over time at the ocean surface. Measurement of transient tracers in the interior ocean thus provides information on the time-scales since the ocean was ventilated, i.e. in contact with the atmosphere. Knowledge of the transit time distribution (TTD) of a water-mass allows for inference of the concentrations or fates of other transient compounds, such as anthropogenic carbon or nitrous oxide. Commonly measured transient tracers are the chlorofluorocarbons (CFCs) 11 and 12, although in the past also CFC-113 and CCl4 have been measured. More recently also the related compound sulphur hexafluoride (SF6) is regularly measured since it provides information on ventilation of the fast ventilated parts of the ocean. Knowledge about ventilation is key to quantify the transport of (climate) perturbations from the surface to interior ocean. For instance, the ocean is storing about 95% of anthropogenic global warming (heat content) and about 30% of anthropogenic carbon. A system of global sustained observations of interior ocean transient tracer observations is an important component of the global climate observing system.
Here I will present some basic concepts of transient tracers, and put that in a global context with focus on societal benefits.