時 間：2017-7-24 11:40am-1:00pm (Seminar starts at 12:00pm)
主 講：Gregory Cutter, Professor
地 點：A3-206 Zhou Long Quan Building
【來訪單位 Institution】：Old Dominion University，USA
【邀請人 Host】：Yihua Cai & Deli Wang 【聯絡人 Contact】：Angela Liu
Abstract:
With a warming ocean whose physical stratification and biological productivity are changing, the depth range and areal extent of oxygen minimum zones (OMZ) in the world’s oceans are increasing. This has tremendous effects on benthic and pelagic fisheries, but it also can affect the cycling of essential trace metals like iron or toxic ones like copper or arsenic. The problem is that simply measuring their concentrations or chemical forms in the water column tells you nothing about what processes are controlling them. For example, soluble Fe+2 (FeII) can be produced from the reduction of iron oxide particles in the water column, but it can also be transported from anoxic coastal sediments – it may not be produced in the OMZ. How do we separate what chemistry is happening in situ (in the water column) from physical transport? We have combined the coupled measurements of trace metal speciation (chemical forms) in the dissolved and particulate states, 228Ra, 234Th, and simple diagnostic modeling techniques to separate ocean chemistry from physics. For this seminar, I will illustrate how we used this approach to examine the cycling of nitrogen (NO2-/NO3-), iodine (I-/IO3-), iron (FeII/FeIII), arsenic (AsIII/AsV), and selenium (SeIV+VI/Se0)in the large OMZ off Peru during the 2013 US GEOTRACES GP16 expedition.
Dr. Cutter is a biogeochemist interested in the fundamental processes linking the biology and chemistry of aquatic systems. He also races sailboats and does adventure motorcycling.
For detailed information about Prof. Cutter, please check https://www.odu.edu/directory/people/g/gcutter
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* 11:40開始提供簡易午餐，12:00開始講座。老師同學們取餐后請直接到A3-206會議室用餐，等待聆聽報告（可以邊吃邊聽）。
* 請老師同學們訪問MEL網頁（http://mel.xmu.edu.cn/lecture.asp?id=1），在本次午餐會的“報名”一欄填寫信息并提交。
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* 本周五下午4點為截止報名時間，總報名人數限制在100名以內。如未及時報上名，可于12:00直接到場聽報告。如已報名但因事不能參加，也請在周五下午4點前告知。
* 午餐會一如既往地歡迎大家的關注，有興趣做講座的老師請與我聯系。
