Design of the NIPR trajectory model

Kinematic and isentropic trajectory models developed at the National Institute of Polar Research(NIPR) are compared with METEX developed at the Center for Global Environmental Research, National Institute for Environmental Studies(CGER/NIES). The NIPR model shows good agreement with METEX both in the kinematic and isentropic trajectories. An intercomparison between the tra-jectories computed with different datasets is also performed using the NIPR model, and shows that the accuracy of the trajectory is far more sensitive to the difference of the dataset used than to the difference of trajectory model.