Previous studies have suggested that chlorophyll D exists only in a small number of marine algae and is distributed in a limited area of ​​the ocean, and its role in the carbon cycle of the Earth is negligible. However, a new study jointly conducted by the Japan Ocean Research and Development Agency and Kyoto University found that the previous conclusions were incorrect.
According to a press release issued by the two agencies, researchers collected water bottom deposits from 9 waters with large differences in water temperature and salt concentrations in the Arctic Ocean, Japan’s Sagami Bay, and the Antarctic waters, and found that all sediments contained Chlorophyll D and its products of photosynthesis.
According to the communique, Chlorophyll D is the only pigment that absorbs near-infrared light at a wavelength of 700 nm to 750 nm for photosynthesis. The above findings indicate that near-infrared light is used in photosynthesis and may affect the carbon cycle on Earth.
Researchers estimate that if the global carbon dioxide absorbed by chlorophyll D is converted to carbon, it may be about 1 billion tons per year, which is equivalent to about one-fourth of the annual increase in average carbon dioxide in the atmosphere.
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