Impacts and mechanism of diabatic heating on atmospheric perturbation potential energy

This study systematically examines the impacts and mechanism of diabatic heating on atmospheric perturbed potential energy(PPE)using statistical correlation analysis and singular value decomposition(SVD)analysis methods.Results show that the coupled correlation features between tropical sea surface temperature(SST)anomalies and PPE are intimately associated with the El Nio-Southern Oscillation(ENSO)phenomenon and those between tropical SST anomalies and extratropical PPE are characterized by the Pacific-North America(PNA)-like pattern. Through further examination of the coupled features between atmospheric apparent heat source(Q1)and PPE,it is demonstrated that over the tropical region the impacts and mechanism between them still mainly reflect ENSO variability,whereas over the extratropical region the coupled patterns between them are manifested by the northern-hemispheric annular mode to some extent.This indicates that the atmospheric local energy availability over the extratropics is closely linked with the remote forcing of tropical diabatic heating and the forcing of local heat source.