関係者各位
沿岸環境科学研究センター
化学汚染・沿岸環境研究拠点（LaMer）
拠点長 岩田 久人
沿岸環境科学研究センター（CMES）において、本年度４月より活動を実施しております、共同利用・共同研究拠点「化学汚染・沿岸環境研究拠点」（LaMer）プロジェクトの一環として、下記の要領で第13回特別講演会を行うこととなりました。
多数のご参加をお待ちしております。聴講は無料・事前申し込み不要です。
記
日時： ２０１６年１２月２６日（月） 午後３：００～４：３０
場所： 総合研究棟1. ６階理学部会議室
題目： Contrasting effects of Asian dust and haze
on dynamics of phytoplankton growth in the Northwest Pacific and Yellow Sea
講師： Huiwang Gao 先生（Ocean University of China 教授）
要約：
Anthropogenic emission of air pollutants enhanced nutrient and toxic substance inputs to oceans, which affect phytoplankton growth and modulate oceanic CO2 fixation and storage.
Fertilization effects of dust aerosols on marine primary productivity (PP) has been determined in many areas of the global ocean, but the impacts of aged dust and anthropogenic aerosols,
e.g., haze particles, on PP are less known. On-board microcosm experiments were conducted in different trophic-level regions including the Northwest Pacific Ocean (NWPO) and Yellow Sea (YS) during the spring cruise by R/V Dongfanghong 2.
We found that the stimulation effect of artificially aged dust on phytoplankton growth was more pronounced in the oceans co-limited by multiple-nutrients (e.g., N and P, or N, P and Fe) than those limited by a single nutrient (e.g, N, P, or Fe).
Haze particles supplied the cultures with an order of magnitude higher N than in the artificially aged dust but with similar amounts of P and Fe.
However, we observed a decrease in chl a concentration at day 2 and 3 after haze particle addition to the cultures, followed by a pronounced increase (comparing with control).
This is in contrast to the continuous increase in chl a concentration in cultures treated with artificially aged dust.
Overall, increase in Chl a in the cultures with haze particles was lower than those with artificially aged dust (all at 2 mg L-1) during the 9/10 day period cultures.
These results suggest that haze particles have a potential inhibition effects on phytoplankton growth, e.g., by copper (Cu), at least in the short time scale (e.g., 2-3 days) under the specific experimental conditions in our study.
Furthermore, comparing to control, the addition of artificially aged dust led to a shift in phytoplankton size towards larger (> 2 μm) cells over the duration of the experiments,
while treatment with haze particles towards smaller sizes.
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The 13th Special Lecture of LaMer Project
To whom it may concern
The 13th Special Lecture of LaMer Project will be held as follows.
This will be a desirable opportunity for those who are interested in the field of Environmental ScienceToxicology.
We welcome many students and researchers to join this seminar.
Admission fee and registration are not required.
Date: December 26, 2016
Time: 15：00 – 16：30
Title: Contrasting effects of Asian dust and haze
on dynamics of phytoplankton growth in the Northwest Pacific and Yellow Sea
Venue: The 6th floor meeting room, Science Research Building 1 (Sogo-Kenkyu-To 1)
Lecturer: Dr.Huiwang Gao（Ocean University of China)
Sincerely
Hisato Iwata, Prof.
Leader of Leading Academia in Marine and Environment Pollution Research
Center for Marine Environmental Studies