Along-trajectory rainfall rate
Posted: October 27th, 2017, 4:54 pm
Hi HYSPLITers
I am interested in along-trajectory meteorological parameter: rainfall rate
I displayed GDAS data text profile and found in 2D field of each 3h interval, there is a "TPP6" (mm): I think it is the accumulated precipitation in the last 3h. Is that right? Is this interpolated from station data or forecasted by the GDAS model? How reliable are the rainfall data? Because I want to only analyze rainfall-producing trajectory, I wish I could use this to screen out dry trajectories. I wrote codes to do this. The weather station rain gauge nearby have a lot of daily data gaps...
In addition, after I generated trajectory, there is a column of rainfall rate (mm/hr) data along the trajectory. How does the HYSPLIT calculate rainfall rate? I found rainfall rate data at the starting point doesn't match the 2D field rainfall data. For example, the rainfall rate of the starting point is 0.3 mm/hr, but the 2D field rainfall amount is as high as 5.0 mm.
Another question is about the rainfall data from ERA-interim model. I have no problem in generating ERA-interim reanalysis files including both analysis and forecast fields (I asked question and get answered from this forum in this summer), but I found in 2D field of each 6h interval, there is a "TPPT" (mm). Is it different from "TPP6" in GDAS?
Also, I found GDAS and ERA-interim data don't match very well in terms of rainfall data (and rainfall rate in trajectories.), although all other data, like wind speed, temperature, potentials, and trajectory pathways are similar.
A lot of question... thanks!!
Ryan
I am interested in along-trajectory meteorological parameter: rainfall rate
I displayed GDAS data text profile and found in 2D field of each 3h interval, there is a "TPP6" (mm): I think it is the accumulated precipitation in the last 3h. Is that right? Is this interpolated from station data or forecasted by the GDAS model? How reliable are the rainfall data? Because I want to only analyze rainfall-producing trajectory, I wish I could use this to screen out dry trajectories. I wrote codes to do this. The weather station rain gauge nearby have a lot of daily data gaps...
In addition, after I generated trajectory, there is a column of rainfall rate (mm/hr) data along the trajectory. How does the HYSPLIT calculate rainfall rate? I found rainfall rate data at the starting point doesn't match the 2D field rainfall data. For example, the rainfall rate of the starting point is 0.3 mm/hr, but the 2D field rainfall amount is as high as 5.0 mm.
Another question is about the rainfall data from ERA-interim model. I have no problem in generating ERA-interim reanalysis files including both analysis and forecast fields (I asked question and get answered from this forum in this summer), but I found in 2D field of each 6h interval, there is a "TPPT" (mm). Is it different from "TPP6" in GDAS?
Also, I found GDAS and ERA-interim data don't match very well in terms of rainfall data (and rainfall rate in trajectories.), although all other data, like wind speed, temperature, potentials, and trajectory pathways are similar.
A lot of question... thanks!!
Ryan