报告摘要：
The worlds’oceans play a key role in the earth climate system. Oceans take up large amounts of atmospheric CO2 through physical and biological processes, and thereby buffer climate change. The supply of macro-nutrients, including phosphorus, nitrogen and silicic acid controls the productivity of phytoplankton in the ocean and consequently the ocean CO2 uptake by biological processes. In recent years it has become clear that a low supply of iron can limit productivity in about 40% of the worlds’ oceans. Furthermore, important roles in controlling ocean productivity for cobalt, manganese and zinc have recently been demonstrated. These trace elements are essential for phytoplankton in various biochemical roles and thus serve as micronutrients.
The International GEOTRACES was initiated in the mid 2000s and has as aim to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes (TEIs) in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions.
As part of GEOTRACES a host of research cruises has been conducted in ocean basins along zonal sections to determine in detail the distributions, sources and sinks of TEIs in the water column. Our team has been leading a range of GEOTRACES activities, where we combine the use of TEIs as tracers for flux processes (e.g. helium isotopes for hydrothermal inputs, aluminium for atmospheric inputs, manganese and radium isotopes for benthic supply) to investigate the biogeochemical cycling of TEIs, and their interactions with surface ocean productivity and the carbon and nitrogen cycles (incl. diazotrophy). This presentation will report on our findings in the Arctic, Atlantic, Pacific and Southern Oceans and highlight the critical roles of TEIs in the present and future oceans.
个人介绍：
Eric P. Achterberg博士，德国亥姆霍兹基尔海洋研究中心教授，国际著名海洋化学家。分别在荷兰瓦格宁根大学、英国利物浦大学获得硕士（1988）、博士（1994）学位。1994年入职英国普利茅斯大学，历任讲师（1994）、高级讲师（1997）、水生生物地球化学reader（2002）；2004年入职英国南安普顿大学，历任海洋生物地球化学reader（2004）、海洋生物地球化学教授（2007-2013），期间任学校研究与企业部副部长（2009-2012）、海洋生物地球化学系主任（2012-2013）；2012年获得英国皇家学会沃尔夫森功绩奖教授。2013年入职德国亥姆霍兹基尔海洋研究中心（2013-至今）。2017年入选英国皇家化学学会会士。Eric Achterberg教授多次担任GEOTRACES航次联合首席科学家，目前是国际GEOTRACES计划学术指导委员会委员。已在高水平期刊发表论文350余篇，包含Nature、Nature Geoscience、Nature Communications、PNAS 等，H-index=71。
