Journal Article 142M471B3J Carbon Dioxide Methane OP0UW79H66 7440-44-0 California Carbon DGVM El Niño-Southern Oscillation Greenhouse Gases Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. atmospheric methane carbon balance carbon sequestration climate change disturbance ecosystem model ecosystem productivity eddy covariance generalized additive modeling lags land use land use and land cover change methane methane emission mutual information predictors random forest