| Budget Amount *help |
¥27,820,000 (Direct Cost: ¥21,400,000、Indirect Cost: ¥6,420,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2012: ¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000)
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| Outline of Final Research Achievements |
Monohalomethanes (chloromethane, bromomethane, and iodomethane) are the dominant organic halogen compounds in the atmosphere. Ocean is an important source of monohalomethane. Spatial-temporal distributions of monohalomethane were measured in the NW Pacific and estern Arctic Ocean. Over the continental shelf of the Chukchi Sea in the Arctic Ocean, the concentration maxima of 3 monohalomethanes were found in the bottom layer water, in which bottom sediment, denitrification would occur owing to a large amount of settling organic particle. In the Funka-Bay, Hokkaido, Japan, concentration maxima of bromomethane and chloromethane were found in the subsurface layer in June when decompositions of organic material proceed. Phytoplankton culture experiment showed that productions of monohalomethane were found in the senescence stage after the exponential growth. It is considered that monohalomethane production in seawater is associated with cell senescence and degradation of organic matter.
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