[周一午餐交流会] 第六讲：Optical properties of dissolved organic matter in the Arctic Ocean

Speaker: Céline Guéguen,

Canada Research Chair in Aquatic Science and Biogeochemistry,

Associate Professor, Department of Chemistry, Trent University

Time: May 12, 2014 (Monday) 11:40-13:30 (the talk will begin at 12:20)

Venue: Multimedia Room, 1st Floor, Zhou Long Quan Bldg (周隆泉楼一楼展厅)

以下是报告摘要：

The optical properties of dissolved organic matter (DOM) were investigated for the first time in the Canadian Arctic Archipelago (CAA), Baffin Bay (BB), and Labrador Sea (LS) as part of the International Polar Year Canada’s Three Oceans project (C3O). The dynamics and composition of absorbing (colored DOM or CDOM) and fluorescing DOM (FDOM) were evaluated in four distinct water masses occupying the three regions: surface waters, Arctic outflow waters, West Greenland Intermediate waters (WGIW) and upper Labrador Sea waters (uLSW). Four fluorescent components were identified by applying parallel factor analysis (PARAFAC) to 522 excitation emission matrix (EEM) spectra: three humic-like and one protein-like. The FDOM in surface waters of the CAA and BB differed considerably in character from those of the LS, with higher fluorescence intensity in the former. The fluorescence intensities of the two terrestrialhumic-like components (C1, C3) were linearly correlated with apparent oxygen utilization (AOU) in the CAA Arctic outflow and the WGIW whereas only humic-like C3 was significantly correlated with AOU in uLSW. These findings suggest that the humic-like components were produced in situ as organic matter was bio-oxidized.

本次午餐会将为报名参加的师生提供午餐，我们将于今天中午前在周隆泉楼一楼展厅门口张贴出海报和报名表格，老师可通过邮件联系施薇（vera_shiwei@xmu.edu.cn）、林庆梅（lqm@xmu.edu.cn）或签字报名，研究生请到周隆泉楼一楼海报区域填写名字报名，按照报名先后顺序，5月9日下午4点以前截止报名，总报名人数限制在100名以内。如未及时报上名，可于12:20直接到场听报告。