Temporal variation of phytoplankton and marine environment in various bays in Miyagi prefecture

Fiscal Year

2014

Title

Project and Theme

Project 1. Study on ecological succession of fisheries ground

Representative Organization: Tohoku University

Theme1. Environmental monitoring in coastal sea areas of Miyagi Prefecture

Representative person	Yoshinari Endo
Organization	Tohoku University
Department	Graduate School of Agricultural Science

Research Information

Period and Interval

2014/04/01 - 2015/03/31
Once a week

Research Area

Shizugawa Bay, Oppa Bay, Ogatsu Bay, Onagawa Bay, Samenoura Bay

Overview

Measurement of water quality (temperature, salinity, turbidity, dissolved oxygen and chlorophyll a) by Rinko profiler and water sampling from sea surface for collecting samples of nutrients and chlorophyll a by van dorn sampler will be conducted once a week at dikes on Shizugawa Bay, Oppa Bay, Ogatsu Bay, Onagawa Bay and Samenoura Bay.Observation using a ship will be conducted irregularly in these bays, and the results will be compared with that obtained at dikes.

Overview of the Observation

Research Point Table

Point

Name	OA
Coordinates	38.56836,141.46733
Remarks	Oppa
Name	O3
Coordinates	38.56534,141.50667
Remarks	Oppa
Name	O4
Coordinates	38.54325,141.50019
Remarks	Oppa
Name	O5
Coordinates	38.57836,141.53008
Remarks	Oppa
Name	A
Coordinates	38.57543,141.46458
Remarks	Oppa
Name	A1
Coordinates	38.56997,141.46583
Remarks	Oppa
Name	B
Coordinates	38.56467,141.46728
Remarks	Oppa
Name	H
Coordinates	38.50225,141.50158
Remarks	Ogatsu
Name	O6
Coordinates	38.51558,141.48217
Remarks	Ogatsu
Name	O7
Coordinates	38.48708,141.51208
Remarks	Ogatsu
Name	S1
Coordinates	38.37572,141.48647
Remarks	Samenoura
Name	OB
Coordinates	38.57711,141.48644
Remarks	Oppa
Name	S2
Coordinates	38.37593,141.49786
Remarks	Samenoura
Name	S3
Coordinates	38.37587,141.5093
Remarks	Samenoura
Name	S4
Coordinates	38.37593,141.52075
Remarks	Samenoura
Name	S5
Coordinates	38.37582,141.53214
Remarks	Samenoura
Name	S6
Coordinates	38.38374,141.50958
Remarks	Samenoura
Name	S7
Coordinates	38.37103,141.49936
Remarks	Samenoura
Name	SS1
Coordinates	38.670815,141.466002
Remarks	Shizugawa (Sodehama)
Name	OP1
Coordinates	38.589399,141.494041
Remarks	Oppa
Name	OG1
Coordinates	38.502374,141.488892
Remarks	Ogatsu
Name	ON1
Coordinates	38.439359,141.478614
Remarks	Onagawa (Kirigasaki)
Name	OC
Coordinates	38.56325,141.49008
Remarks	Oppa
Name	ON4
Coordinates	38.409528,141.490847
Remarks	Onagawa (Tsukahama)
Name	SA1
Coordinates	38.369041,141.4922
Remarks	Samenoura
Name	SS5
Coordinates	38.638855,141.504835
Remarks	Shizugawa (Fujihama)
Name	OD
Coordinates	38.55107,141.4923
Remarks	Oppa
Name	OE
Coordinates	38.57783,141.50717
Remarks	Oppa
Name	OF
Coordinates	38.58857,141.51586
Remarks	Oppa
Name	OG
Coordinates	38.56107,141.52753
Remarks	Oppa
Name	O1
Coordinates	38.57721,141.47311
Remarks	Oppa
Name	O2
Coordinates	38.58419,141.49508
Remarks	Oppa

Results and Future Plan

*Temporal variation in temperature was similar among the bays. On the other hand, marked difference in salinity among the bays was observed during the period from spring to early summer. This suggests that impact of fresh water input from the land area on environment in the bay was remarkably different among the bays during this period. *Nutrient in the bays was characterized by nitrate concentration in winter and phosphate concentration in spring and autumn. Comparisons between salinity and nutrients revealed that the characteristics of nutrient in the bays may not result from the impact of fresh water input. *Temporal variation in chlorophyll a revealed that phytoplankton bloom occurred mainly in response to inflow of Oyashio water into the bay in every bay, but its duration and magnitude differed considerably depending on the bays.

Investigation Item and Data Acquisition

Investigation Item	Data Acquisition
Water quality	1. vertical distribution of temperature, salinity, turbidity, dissolved oxygen and chlorophyll a. 2. nutrients and chlorophyll a at sea surface.

Reference

Related Observation Plan

FY2014 Temporal variation of phytoplankton and marine environment in various bays in Miyagi prefecture

Related Observation Data

CTD Ogatsu (plankton) 140401-140929
CTD Onagawa (plankton) 140401-140929
CTD Oppa (plankton) 140401-140929
CTD Shizugawa (plankton) 140401-140929
CTD Ogatsu (plankton) 141005-150528
CTD Onagawa (plankton) 141005-150528
CTD Oppa (plankton) 141005-150528
CTD Shizugawa (plankton) 141005-150528
Chl. a (SS1, OP1, OG1, ON1) 140325-150528
Nutrients (SS1, OP1, OG1, ON1) 140325-150528

Person in charge of Investigation

Representative person	Yasushi Gomi
Organization	Tohoku University
Department	Graduate School of Agricultural Science

Keywords

Fiscal Year	2014
Organization	Tohoku University
Category	Field survey
Research Area	South Sanriku
Discipline	Ocean physics -> Water temperature Ocean physics -> Salinity Ocean physics -> Others Ocean chemistry -> Salinity Ocean chemistry -> Dissolved oxygen Ocean chemistry -> Nutrients Ocean environment -> Nutrients Ocean environment -> Plant pigments Ocean environment -> Seawater Ocean biology / Ocean ecology -> Biomass Ocean biology / Ocean ecology -> Plankton

Temporal variation of phytoplankton and marine environment in various bays in Miyagi prefecture

Fiscal Year

Title

Project and Theme

Project 1. Study on ecological succession of fisheries ground

Theme1. Environmental monitoring in coastal sea areas of Miyagi Prefecture

Research Information

Period and Interval

Research Area

Category

Overview

Overview of the Observation

Research Point Table

Results and Future Plan

Investigation Item and Data Acquisition

Reference

Related Observation Plan

Related Observation Data

Person in charge of Investigation

Keywords