Backward trajectory calculation based on ERA-Interim 6-hr UVW

Backward trajectory calculation is based on the linear interpolation and first-guess velocity for efficiency. Accurate calculation agrithm can be found in http://journals.ametsoc.org/doi/abs/10.1175/BAMS-D-14-00110.1

control-run-traj-model.py

Control script to run the traj_model with multiple input files. Integration step and other parameters can be set here. You may run this script for batch calculation.

back_traj_model-multi-input-files.py

Core calculation script with multiple input files. You can modify this file to utilize accurate algrithm.

back_traj_model-one-input-file.py

Calculation script with only one input file (multiple timeframes).