Many Living Things near Typhoon
Sea surface area of cubic Earth is about 9.2 million km2. About 0.1% (0.09 million km2, circle area having a half radius of about 170 km) is assumed as the upwelling area where shallow water is vertically well mixed by the effects of typhoon. In the upwelling region, surface water becomes eutrophic with a supply of nutrients from subsurface depths, and high biological productivity can be expected. Coastal area is assumed to be about 2% where productivity follows the upwelling area by a support of nutrients from land.
Very Few Living Things in Most of Sea
The rest is assumed as the offshore area having poor productivity because of insufficient supply of nutrients to the surface due to poor vertical water mixing with a strong stratification, although there is rich solar radiation.
Food Chain in Sea
There are 3 groups of organisms in the marine ecosystem on the Earth; primary producers (plants), consumers (animals) and decomposers (heterotrophic microorganisms). They have created a highly developed grazing food chain where animals consume foods actively. A similar ecosystem is anticipated in the sea of cubic Earth although the top of ecosystem is not fish or marine mammal but the people which is extremely unique and major difference compared to the Earth. Table 1 describes estimated yearly productivity in the 3 sea areas of cubic Earth. Primary productivity per unit area shows a difference such as 6:2:1 for upwelling, coastal and offshore areas, respectively. Yearly fish productivity estimated in the sea of cubic Earth are 64.8, 3.4, and 0.089 million tons in upwelling, coastal and offshore areas, respectively. The differences in fish productivity between the 3 sea areas largely increase such as 728:38:1 compared to those of primary productivity mentioned above, due to the effects of differences in the number of ecological steps and ecological efficiency.
Furthermore, deep water of the sea on the cubic Earth is expected to be anoxic such as Black Sea because of prohibited mixing of water between the surface and the deep depths with a strong vertical stratification and consuming oxygen for oxidizing organic matter settled out from the shallow depths.
