Impact of the HYSPLIT model top to trajectories
Posted: May 31st, 2022, 7:27 am
Hello,
I am running the HYSPLIT model with WRF input data. The WRF simulation is aimed on leeside warming of a mountain range (max. elevation about 1300 m ASL). The WRF model top is 25 hPa (ca. 25 000 m). I would like to compute trajectiories in HYSPLIT to get information about the source region of subsiding air. However, I am a bit confused by the impact of the option Top of model in HYSPLIT (under Trajectory - Setup run) on computed backward trajectories.
When this parameter is set to 25 000 m, the trajectory is short and stops just before the mountains. When set to 40 000 m the trajetory is reasonably long with regard to environmental wind speed and gets to > 1500 m ASL For 100 000 m, the trajectory is very similar but not completely the same as for 40 000 m. I am thus wandering what setup of HYSPLIT model top is the best for my case and why there are the differences.
I am enclosing trajectories for all cases.
Thank you very much!
Michael
I am running the HYSPLIT model with WRF input data. The WRF simulation is aimed on leeside warming of a mountain range (max. elevation about 1300 m ASL). The WRF model top is 25 hPa (ca. 25 000 m). I would like to compute trajectiories in HYSPLIT to get information about the source region of subsiding air. However, I am a bit confused by the impact of the option Top of model in HYSPLIT (under Trajectory - Setup run) on computed backward trajectories.
When this parameter is set to 25 000 m, the trajectory is short and stops just before the mountains. When set to 40 000 m the trajetory is reasonably long with regard to environmental wind speed and gets to > 1500 m ASL For 100 000 m, the trajectory is very similar but not completely the same as for 40 000 m. I am thus wandering what setup of HYSPLIT model top is the best for my case and why there are the differences.
I am enclosing trajectories for all cases.
Thank you very much!
Michael