Abstract
This study intends to evaluate the seasonal flow direction of CH4 in Northeast Asia by using GOSAT (Greenhouse Observing SATellite), in an attempt to overcome costly, laborious and time consuming ground observation which has been frequently pointed out in existing studies. It was found that the overall spatial distribution of Methane gas in Northeast Asia varies depending on the latitude, and that CH4 mainly flows southeast or east in spring, autumn and winter, but northeast or north in summer. Similar to the flow of prevailing wind and monsoons in Northeast Asia, these results show that CH4 flows mainly from the west to the east. The results also indicate that methane gas discharged from China is influencing even the Korean Peninsula and Japan.
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