11:45 AM - 12:00 PM
[AAS21-16] Temporal variation of methane profile observed with FTIR at Tsukuba
Keywords:FTIR, Greenhouse Gas, Methane
CH4 is the second important contributor of the anthropogenically enhanced greenhouse effect but there are many uncertainties in the source variations.
Daily averaged CH4 total column density kept a level from 2001 to 2006, then increased from 2007 to 2008, and again kept a level from 2009 to 2014. Tropopause height shows no significant change between before and after 2007, indicating stable dynamical situation. Derived CH4 profiles show that the increase occurred mainly in the troposphere.