Hitoshi MUKAI

Center for Global Environmental Research, National Institude for Environmental Studies

Yukio TERAO and Shohei NOMURA

Center for Global Environmental Research, National Institude for Environmental Studies

The operational framework of Mt. Fuji weather station shifted from a manned observation to the unmanned observation at 2004 then the station is not supplied the power and closed during Sep-Jun. National Institute for Environmental Studies (NIES) made the automatic CO2 observation system that is able to charge the power to 100 batteries during Jul-Aug and measure the CO2 concentration at Mt. Fuji throughout the year. The system was installed at the station on July 2009.

As results, (1) the CO2 concentration at Mt. Fuji is lower and higher than those of Mauna Loa which shows the averaged CO2 concentration level in North hemisphere in summer and winter, respectively; (2) the CO2 level at Mt. Fuji showed the same level with aircraft measurement around Mt. Fuji; (3) the CO2 growth rate of CO2 concentration at Mt. Fuji showed the similar variation with that of Mauna Loa; (4) the inter-annual variability for CO2 growth rate of Mt. Fuji related with the ENSO Index.

On July 2017, we began to the flask sampling once a month at the summit to monitor greenhouse gases. We collected the flasks and analyzed on July 2018. The CH4 and N2O at Mt. Fuji showed higher than those of Mauna Loa.