GEOS/IMERG
Comparisons of precipitation from GEOS output and IMERG
GEOS
The Goddard Earth Observing System (GEOS) output data are available
from 12 Aug 2018 to 31 Dec 2019.
There are many variables in GEOS output. The PRECTOT is the only
variable of interest for this study. PRECTOT is a global precipitation
product with resolutions of 0.3125 deg in longitude and 0.25 deg in latitude.
The unit is kg m^-2 s^-1, which is equivalent to mm/s.
Comparisons with IMERG
The comparisons are conducted over the globe using
the above GEOS data and V06B IMERG Final Run data during the commonly
available period from 12 Aug 2018 to 31 Oct 2019.
Note GEOS files for these days are missing:
18 Aug 2018, 15 Dec 2018, 26 Apr 2019, 27 Apr 2019
Half-hourly IMERG precipitation data at 0.1X0.1 deg are accumulated to hourly
resolution, and then averaged to 0.3125X0.25 deg grids.
- Density plot for hourly precipitation during the period from 12 Aug 2018 to 31 Oct 2019
- PDF plots for hourly precipitation occurrences and volumes.
- PDF plot for hourly precipitation during the period from 12 Aug 2018 to 31 Oct 2019
- Hourly precipitation contours
Precipitation rates less than 0.1 mm/h from both GEOS and IMERG
are not plotted as the GEOS gets a lot of suspicious light precipitation.
- Daily and monthly precipitation contours
Daily precipitation rates are estimated from hourly data where
precipitation less than 0.1 mm/h is set to 0 for IMERG and GEOS,
respectively.
Monthly precipitation rates are estimated from the daily rates
if more than 15 days are available.
- Mean hourly precipitation contour during the period from 12 Aug 2018 to 31 Oct 2019
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