Funka Bay is an inner bay located in the southwestern part of
The areas shaded in black in the figure on the left below were
once oceans hundreds of thousands of years ago. Funka Bay is thought to have
been a strait connecting the Pacific Ocean and the Sea of Japan long ago.
Please look at the ocean current map (left figure below). You
can see the cold Oyashio current and the warm Kuroshio current (→Tsugaru Warm
Current) flowing nearby.
In early spring, the Oyashio water flows into Funka Bay. In the
late summer, the Tsugaru Warm Current flows into Funka Bay.
The water in Funka Bay switches out in early spring and late
summer. Hence, the water remains in the bay from spring to summer and autumn to
During that period, it is possible to
track water changes over time in the open-ocean water
(Oyashio water, Kuroshio water).
（It is almost impossible to observe the same water in areas with
an ocean current even if observations are recorded in the same location every
We are continuing ocean observations of Funka Bay every month
with the idea that we will be able to discover various things.
We have clarified the factors that change the concentration of
plant-derived isoprene and the resultant knowledge on the generation of organic
There is a diatom bloom every year for about three weeks
starting in early March. Approximately half of the annual primary production in
Funka Bay is supported by this diatom bloom in the spring.
The following is a distribution of chlorophyll concentration on
the sea surface, which was measured using satellites.
What is measured at Funka Bay?
We measure as many basic parameters of
ocean chemistry as possible.
Seawater components：dissolved oxygen, total
carbonate, alkalinity, nutrients (five components), organic gas
components (halocarbons, isoprene, of which methane is included)
Particle components： diatom suspensions
during diatom bloom (vertically collected with NORPAC Net)→Carbon, nitrogen, phosphorus, silicon (of
which, iodine is also included)
Sediment components： nutrients, organic
gas components, carbon, nitrogen, phosphorus, silicon
the time being, we measure everything we can. Though we have not fully analyzed
everything… （This paper focuses on the
analysis of organic gas components, which is the main research theme. Of these,
carbon, nitrogen, and silicon are included）
Photobook of observations at Funka Bay (some include links to
A large amount of diatom aggregate is collected and used
for the decomposition culture experiments. We always receive the cooperation of
members of the Fisheries Science Group. Thank you.
This is a sediment sample.
We attempted to investigate the chemical environment of
sediments and the state of benthic organisms.
Ashura sediment core sampler. This can collect three sediment core samples at
The landscape looks beautiful during winter. This is Mt. Yotei.
The picture below shows a sample treatment where the pore water
is sucked out on board the Ushio-Maru.
Mr. Miyashita (left) was recording observations with a runny
nose like a little kid.
The top two students who conducted the Funka Bay
observations. They have both found jobs at an environmental consulting firm.
The dining scene at Ushio-Maru. We want to eat seafood curry on
CTD rosette sampler on Ushio-Maru. A miniature size around this
scale is easier to use.
Observations from around ten years ago. Professor Emeritus Kuma
(right) stood on the front lines of the observation process until just before