Spatial and Temporal Variability of Satellite Primary Production in the Japan Sea from 1998 to 2002 |
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| Authors: | Keiko?Yamada Email author" target="_blank">Joji?IshizakaEmail author Hiroshi?Nagata |
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| Institution: | (1) Graduate School of Science and Technology, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan;(2) Faculty of Fisheries, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan;(3) Seikai National Fisheries Research Institute, Fisheries Research Agency, Taira, Nagasaki 851-2213, Japan |
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| Abstract: | The spatial and seasonal variability of primary production in the Japan Sea from 1998 to 2002 was estimated using a satellite
primary production model. A size-fractionated primary production model was validated by in situ primary production data measured in the Japan Sea. Estimated primary production and in situ primary production showed a good positive correlation. Estimated primary production showed spatial variability. Annual primary
production levels were 170, 161, 191 and 222 gC m−2year−1 at the Russian coast, in the middle of the Japan Basin, the southeastern area and the southwestern area, respectively. It
was higher to the south around 40°N than to the north, and higher in the western area than in the eastern one. Peaks of primary
production appeared twice, in spring and fall, in the southern area, while a single peak appeared in the northern area. Primary
production along the Russian coast was higher than in other areas during summer. The spring bloom contributed 42% to the annual
primary production in these four areas. Furthermore, estimated primary production showed an interannual variability that was
largest in spring. Primary production in fall also showed interannual variability, especially in the middle of the Japan Basin
and the southwestern area. This corresponded mainly to the size of the phytoplankton bloom in each year. Winter convection
by wind and the depth of nutrient-rich, cold subsurface water underlying the Tsushima Current may contribute to the nutrient
supply to upper layer and interannual variations of primary production in spring. |
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| Keywords: | Primary production ocean color remote sensing the Japan Sea |
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