Assessing the Accuracy of our Seawater Temperature at the Surface andDissolved Oxygen Data
Sanetoki Matsuno, Miraz Hossain Chowdhury
Introduction
The ocean plays a crucial role in regulating global climate systems
and supporting marine ecosystems. Monitoring key parameterssuch as Seawater Temperature and Dissolved Oxygen levels
essential for understanding changes in oceanic biodiversity and theirimpacts on marine life. By evaluating these measurements, we aim toenhance our understanding about marine ecosystems.
As we were learning about ocean in MIRAIE, we have collected Seawater
Temperature at the surface and Dissolved Oxygen data from Mikawa Bay
To Philippine Sea. By our seven days of data collecting experience wehave gathered Seawater Temperature at the surface and Dissolved
Oxygen. We learned how this data can affect ocean and people.

Methods• In order to collect Dissolved Oxygen data. We collected the data by using
bucket with rope. Then we used the probe that can measure the amountof Dissolved Oxygen. In order to use it, we had to calibrate it.
• We used bucket to collect Seawater Temperature at the surface. Then I
used the Vernier Temperature Probe which was proved that it is accurate
when it was put into ice to measure the temperature.
• We chose a representative from 7 average daily 100m temperature maps.
• We used the GLOBE table showing the expected Dissolved Oxygen in salt
water at sea level (1013.25mB) with temperature and salinity from Quality
Control Procedure for Dissolved Oxygen Kit.

Discussion andConclusions
As we compared our seawater temperature at the surface tothe map of seawater temperature, we noticed that our data
was accurate and reliable. Also our Dissolved Oxygen data
was similar to the expectations.
We also noticed that as Seawater Temperature rises theamount of Dissolved Oxygen decreases. We learned this isbecause when the temperature rises, the molecules ofseawater move faster, which makes Dissolved Oxygen
diffuse of the water.

Average Seawater Temperature map

Question

We compared ourdata to this map
which shows
average daily 100m
seawatertemperature
between Mikawa
Bay, Japan andPhilippine Sea.

Is the seawater temperature at the surface
and dissolved oxygen data reliable?

HypothesisWe think most of the data are accurate. Some data maybe
inaccurate because if we leave our seawater(data) inside thebucket for extremely long time, Dissolved Oxygen canget out from seawater. If Dissolved
Oxygen gets out from the seawater, it can make our data
different from the reality.
This is tall ship MIRAIE on theway to Palau from Yokohama
Port, Japan.

Illustration by our instructor
Ms. Christina Buffington

Source: Met Office of Japan, 2024

Results

Next Steps
1. As we were learning about sea temperature rising inMIRAIE, we started to wonder about the difference ofSeawater Temperature between ancient times and now,
so that we can know how humans affected on Seawater
Temperature.
2. We hope our expertise will help us to enhance ourthinking capability, and by this expertise we wish tobroaden our expertise in wide range of marine area.

Acknowledgements
The authors would like to give special thanks to Ms. Christina,OPRI, Sasakawa Peace Foundation, OPRI 2024 Trainees, and all
the crew of MIRAIE who supported us with this experiment.