Is it possible to convert the dB into mm/hr?

[GES DISC - ingridgs]

In Product 2A25 the variable "errorRain" is expressed in decibel(dB). I would like to know how to relate this to the corresponding measurements in "e_SurfRain" and "nearSurfRain", which are in mm/h. Is it possible to convert the dB into mm/hr?

Answer:
Please see the TRMM PR Handbook for additional information at:
http://www.eorc.jaxa.jp/TRMM/documents/PR_algorithm_product_information/pr_manual/PR_Instruction_Manual_V7_L1.pdf

The errors are in dB so to convert to a linear unit:

X in dB, x in linear

x = 10^(X/10)

For Z, the error in dB can be added/subtracted directly.

For R, convert to linear units.

All errors are relative.

Say, error is 4dB for one ifov and 1dB for another ifov.

The difference is 3dB = a factor of 2, twice as much error.