GPCC/Level-3 MRMS
Comparisons of precipitation from GPCC and Level-3 MRMS
GPCC
The Global Precipitation Climatology Centre (GPCC) is operated by
Germany's National Meteorological Service, the Deutscher
Wetterdienst(DWD) under the auspices of the World Meteorological Organization
(WMO). GPCC provides global precipitation analyses for monitoring and
research of the earth's climate.
For more information about GPCC, visit https://www.dwd.de/EN/ourservices/gpcc/gpcc.html
This study utilizes the GPCC Full Data Daily Version 2018, Daily
Land-Surface Precipitation from Rain-Gauges built on GTS-based and
Historic Data at 1-deg resolution.
As of this analysis, this product is available from 1988 to 2016.
Comparisons with MRMS
The comparisons are conducted over the CONUS (25N-50N, 125W-65W) using
above GPCC data and level-3 MRMS data during the commonly
available periods from Jun 2014 to Dec 2016 except for Jan-May 2016
when MRMS data are missing.
Note there are also quite a few MRMS missings in other periods.
MRMS precipitation data at 30-min and 0.01-deg resolution are QCed by
applying following conditions:
RQI=100, 0.5<=ratio<=2, liquid precipitation only (no snow/frozen precipitation)
Then the QCed 30-min/0.01-deg MRMS precipitation data are resampled to 1-deg
daily resolution. The daily precipitation is estimated when at least
50% of time is available; otherwise, it is set to missing.
Two methods are used in converting MRMS precipitation from 0.01-deg to 1-deg grids.
(1) Congrid, a build-in IDL function. This is basically used as the
nearest neighbor sampling in this analysis.
(2) simpleAve, simply avearge all valid 0.01-deg data to 1-deg grid.
The density plots for daily and monthly precipitation from MRMS
(congrid and simpleAve) and GPCC are provided below.
- Density plot for daily (1o) precipitation
Density plots for GPCC vs QCed MRMS (both precipitation >=0.1 mm/d).
- Density plot for monthly (1o) precipitation
Monthly precipitation is accumulated from daily data in the
month when at least 15 days of data are available.
- Daily precipitation [mm] contours
Daily MRMS precipitation is accumulated from the above QCed
half-hourly data at 0.01 deg resolution and then resampled to
1-deg resolution.
Visit this
page for un-QCed MRMS precipitation contours.
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