Tuesday, October 19

Tag: sea

Will “Blue Carbon” Save the Earth?
Economy

Will “Blue Carbon” Save the Earth?

Carbon dioxide in the atmosphere that causes global warming. The coastal area of ​​the sea is attracting attention as a sink. Seagrass such as eelgrass grows on the seabed in shallow coastal waters, and there are many phytoplankton. Therefore, it is expected that it will absorb carbon dioxide in the same way as forests. The term “blue carbon” is also used to refer to the carbon absorbed and stored by organisms growing in the blue sea, as opposed to “green carbon” in which green forests absorb carbon dioxide by photosynthesis and store it in the body as carbon. It has come to be.Difficulty in blue carbon researchFigure 1 Eelgrass growing on the seabed of Hashirimizu Beach (Yokosuka City, Kanagawa Prefecture) (provided by Mr. Kuwae)Research on blue carbon lags behind that of forest green car...
Coral may still be intolerant of ocean acidification
Economy

Coral may still be intolerant of ocean acidification

The sea is now gradually acidifying. The sea is originally weakly alkaline, but when carbon dioxide that has increased in the atmosphere dissolves more through the surface of the sea, its alkalinity weakens. This is the acidification of the sea.Probably the most troublesome creatures in the acidification of the sea are shellfish and corals whose shells and skeletons are made of a substance called “calcium carbonate”. There is a lot of calcium in seawater, but when the sea is acidified, “carbonic acid” (carbonate ions) decreases, making it impossible to make shells and skeletons.There is a type of coral called “reef-building coral”. I make the foundation of calcium carbonate myself and stick to it to live. As a lot of corals gather and continue to make a harder foundation, the foundation gr...
The subtropical sea warms up once every 100 years
Economy

The subtropical sea warms up once every 100 years

When you go to the beach and swim, the warm water may suddenly become cold. The boundary between warm and cold water passed by. Even in a hot spring bath where hot water flows, the water temperature is quite different between the top and bottom. If you do not stir, the whole will not reach the same temperature. Water is quite difficult to mix.In the subtropical waters, there is a huge mass of water that is submerged without being mixed with the surroundings. The image is that a mass of water that stretches for thousands of kilometers slowly moves to a depth of hundreds of meters from the surface of the sea, like a huge submarine. This mass of water is called “subtropical mode water”. For example, it can be formed in the sea area on the south side of the Kuroshio Current, which flows north ...
Arctic sea ice causes a sharp decline in summer due to slight slack in early spring
Economy

Arctic sea ice causes a sharp decline in summer due to slight slack in early spring

Arctic sea ice continues to decline. The area of ​​sea ice in summer has nearly halved in the last 40 years. It seems to be the effect of global warming. The Arctic Surveillance and Assessment Program (AMAP), an international organization of researchers involved in the Arctic, warns that ice may disappear completely from the Arctic Ocean in the summer in the late 2030s. Even so, why is the ice floating in the Arctic Ocean so sharply reduced?At ski resorts with snow, it’s so dazzling that you can’t open your eyes without wearing sunglasses and goggles. Snow reflects most of the light coming from the sun.The rate at which the surface of the earth reflects sunlight is called “albedo” in scientific terms. Albedo of fresh snow and sea ice covered with snow is about 80%, and reflects most of the...