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Correlation Relationship between Chlorophyll-A Concentration and Atmospheric Aerosol above Kashevarov Bank and Krusenstern Bank

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Not only does the objective of climate-forming factors research imply the direct study of their dynamics and spatiotemporal distribution, but also the study of their interaction with other radiation-active components. Atmospheric aerosol and phytoplankton are among these components. Aerosol direct influence on the condition of photosynthesizing systems of the Far Eastern seas was studied in the work of [Bukin, Shmirko], who indicate that after aerosol emission into the ocean upper layer, there occurs a dramatic rise in chlorophyll-A concentration. Meanwhile, research of phytoplankton contribution into aerosol field formation processes presents considerable difficulties, as the way this influence is carried out is still not entirely clear. There is a hypothesis stating that in the course of their life activity phytoplankton cells produce dimethylsulphide which acts as condensation nuclei and must lead to formation of near-surface aerosol (mists, oceanic haze).

One of the goals of the expedition around the Sea of Okhotsk and the Sea of Japan, carried out from August 3 till September 2, was an attempt of proving or disproving the presence of an inverse relationship between aerosol fields and phytoplankton communities via alternative methods. Thus, regular measurements of biooptical parameters of sea water and optical atmospheric parameters (boundary layer height, average extinction coefficient for the atmospheric boundary layer) were taken aboard the ship.

Kashevarov Bank and Krusenstern Bank dramatically stand out among all the data obtained. It is there that abrupt changes of chlorophyll-A concentration, planetary boundary level height, and extinction coefficient were observed.

Kashevarov Bank and Krusenstern Bank are underwater banks with their tops being 100–150 meters below the water surface. Despite their different geographic position and climatic conditions, areas of thick fog, and chlorophyll-A high concentration on boundaries were observed on both banks. This makes Kashevarov Bank and Krusenstern Bank a suitable area for testing a possible link between phytoplankton and atmospheric aerosol.

Document Type: Research Article


Publication date: January 1, 2011

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