Systematic biases in large‐scale estimates of wetland methane emissions arising from water table formulations

摘要: [1] Most earth system models that simulate wetland methane emissions ignore spatial variability of water table depth. We compared estimated using two commonly-used approximations (wet-dry and uniform) to a scheme accounts for variability, several combinations model parameter values range depth (σzwt). The approximations' biases were consistent across sets. wet-dry scheme's smallest in absolute value (+/−5–10%) when σzwt was large (38 cm) but increased between −85% −95% as approached 0. uniform largest (+/−100% or more) vanished For typical boreal wetlands, these schemes' previous predictions global will double by 2100 are error factors ranging from 0.7 1.3. Similar may affect paleoclimate studies.