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、２０１６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16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： ２０１７年７月２５日（火） 午前９：００～１０：００
場所： 総合研究棟1. ４階会議室
題目： Analytical solution of the nitracline with the evolution of subsurface chlorophyll maximum in stratified water columns
講師： Huiwang Gao 教授（Ocean University of China）
要約： In a stratified water column, the nitracline is a layer where the nitrate concentration increases below the nutrient-depleted upper layer, exhibiting a strong vertical gradient in the euphotic zone.
The subsurface chlorophyll maximum layer (SCML) forms near the bottom of the euphotic zone, acting as a trap to diminish the upward nutrient supply.
Depth and steepness of the nitracline are important measurable parameters related to the vertical transport of nitrate into the euphotic zone.
The correlation between the SCML and the nitracline has been widely reported in the literature, but the analytic solution for the relationship between them is not well established.
By incorporating a piecewise function for the approximate Gaussian vertical profile of chlorophyll, we derive analytical solutions of a specified nutrient?phytoplankton model.
The model is well suited to explain basic dependencies between a nitracline and an SCML.
The analytical solution shows that the nitracline depth is deeper than the depth of the SCML, shoaling with an increase in the light attenuation coefficient and with a decrease in surface light intensity.
The inverse proportional relationship between the light level at the nitracline depth and the maximum rate of new primary production is derived.
Analytic solutions also show that a thinner SCML corresponds to a steeper nitracline.
The nitracline steepness is positively related to the light attenuation coefficient but independent of surface light intensity. The derived equations of the nitracline in relation to the SCML provide further insight into the important role of the nitracline in marine pelagic ecosystems.
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The 16th Special Lecture of LaMer Project
To whom it may concern
The 16th 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: July 25, 2017
Time: 9：00 – 10：00
Title: Contrasting effects of Asian dust and haze on dynamics of
phytoplankton growth in the Northwest Pacific and Yellow Sea
Venue: The 4th 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
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