讲座题目：Natural and Artificial Iron Fertilization in the Ocean
主 讲 人：Prof. Fei CHAI (柴扉) School of Marine Sciences, The University of Maine, USA
主 持 人：丁平兴 教授
开始时间：2015-03-05 14:00
讲座地址：河口海岸大楼二楼会议室
主办单位：地球科学学部
讲座简介：
Iron regulates phytoplankton productivity in high nutrient and low chlorophyll (HNLC) areas of the world ocean. There are several natural pathways for iron entering the upper ocean: iron deposition during atmospheric dust events; volcanic ash deposition; mesoscale ocean eddy transport of iron to HNLC areas. A few examples of natural iron fertilization events that cause phytoplankton blooms in the ocean will be presented. During the past two decades, there were 14 artificial iron fertilization experiments, in which iron is added to the upper ocean in HNLC regions deliberately. Some key results and unresolved issues from these artificial iron fertilization experiments will be discussed. One recent iron fertilization experiment was conducted in August 2012, during which the Haida Salmon Restoration Corporation dumped over 100 tons of an iron-containing substance into surface waters of a Haida eddy in the Gulf of Alaska. Here, we use available satellite bio-optical measurements from the MODIS/Aqua instrument and AVISO altimeter dynamic height data to examine the timing, magnitude and extent of this artificial iron fertilization experiment. This iron fertilization experiment induced the most intensive phytoplankton bloom of the past 10 years in the Gulf of Alaska. The extent to which this localized iron fertilization experiment may impact higher trophic levels such as salmon remains uncertain.
报告人介绍：
Dr. Fei CHAI is a professor and Director of the School of Marine Sciences at the University of Maine. Dr. Chai studies physical and biological processes contributing to global carbon cycle, and the role of iron regulating biological productivity and biological pump transferring carbon into deep ocean, and climate variability affecting marine ecosystems and fisheries. Dr. Chai is an expert in developing and testing physical-biological models, and using models along with observational data to address key regional and global questions and issues. Much of his work has been interdisciplinary, emphasizing physical, biogeochemical processes in the ocean and marine ecosystems. Dr. Chai has authored and co-authored over 110 peer-reviewed publications covering many important ocean and marine ecosystem related topics. Dr. Chai teaches oceanography and climate change related courses at the University of Maine. He serves as committee member for several international scientific organizations and programs, prompting interdisciplinary and collaborative research projects.
