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MERRA: MODERN-ERA RETROSPECTIVE ANALYSIS FOR RESEARCH AND APPLICATIONS
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Begin Main Content
MERRA studies of Hydrological Extremes
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The GEOS5-MERRA reanalysis products will cover the satellite era from 1979 to the present.
A special focus of the atmospheric assimilation will be the hydrological cycle.
At present we use the GEOS4-CERES experiment as a demonstration and placeholder.
The GEOS4-CERES reprocessing was performed to support the CERES instrument team
research efforts. It is not publicly available.
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Wet versus Dry comparison
In the figures below we focus on the difference
between two seasons in North America:
- summer 1988: Drought
- summer 1993: Rainy
The four compared data sets are
the GMAO assimilation experiment GEOS4-ceres,
the ECMWF 40-year reanalysis
(((The spatial resolutions of these gridded products are tabulated on our page
Basic Climate Analysis.
Click on any image to expand it in a separate window.
Figure 1. Precip
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The difference in Precipitation (mm/day)
for the wet (1993) minus dry (1988) season are displayed
for the five data sets
GEOS4-CERES (upper left),
NCEP-R2 (upper middle),
ERA-40 (upper right),
JRA-25 (lower left),
GPCP (lower middle).
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Figure 2. TPW
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The difference in Total Precipitable Water (TPW; kg/m^2)
for the wet (1993) minus dry (1988) season are displayed
for the five data sets
GEOS4-CERES (upper left),
NCEP-R2 (upper middle),
ERA-40 (upper right),
JRA-25 (lower left),
NVAP (lower middle).
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Figure 3. Evap
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The difference in Evaporation (mm/day)
for the wet (1993) minus dry (1988) season are displayed
for the four data sets
GEOS4-CERES (upper left), NCEP-R2 (upper right),
ERA-40 (lower left), JRA-25 (lower right).
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Figure 4. T2m
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The difference in Temperature (K) at 2 meter
for the wet (1993) minus dry (1988) season are displayed
for the four data sets
GEOS4-CERES (upper left), NCEP-R2 (upper right),
ERA-40 (lower left), JRA-25 (lower right).
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Figure 5. h - 500mb
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The difference in Heights at 500mb (gpm)
for the wet (1993) minus dry (1988) season are displayed
for the four data sets
GEOS4-CERES (upper left), NCEP-R2 (upper right),
ERA-40 (lower left), JRA-25 (lower right).
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Figure 6. U - 300 mb
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The difference in U winds at 300 mb (m/s)
for the wet (1993) minus dry (1988) season are displayed
for the four data sets
GEOS4-CERES (upper left), NCEP-R2 (upper right),
ERA-40 (lower left), JRA-25 (lower right).
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Figure 7. V - 300 mb
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The difference in V winds at 300 mb (m/s)
for the wet (1993) minus dry (1988) season are displayed
for the four data sets
GEOS4-CERES (upper left), NCEP-R2 (upper right),
ERA-40 (lower left), JRA-25 (lower right).
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Figure 8. U - 850 mb
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The difference in U winds at 850 mb (m/s)
for the wet (1993) minus dry (1988) season are displayed
for the four data sets
GEOS4-CERES (upper left), NCEP-R2 (upper right),
ERA-40 (lower left), JRA-25 (lower right).
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Figure 9. V - 850 mb
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The difference in V winds at 850 mb (m/s)
for the wet (1993) minus dry (1988) season are displayed
for the four data sets
GEOS4-CERES (upper left), NCEP-R2 (upper right),
ERA-40 (lower left), JRA-25 (lower right).
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Figure 10. LHF
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The difference in Latent Heat Flux (W/m2)
for the wet (1993) minus dry (1988) season are displayed
for the five data sets
GEOS4-CERES (upper left),
NCEP-R2 (upper middle),
ERA-40 (upper right),
JRA-25 (lower left),
GSWP2 (lower middle).
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Figure 11. SHF
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The difference in Sensible Heat Flux (W/m2)
for the wet (1993) minus dry (1988) season are displayed
for the five data sets
GEOS4-CERES (upper left),
NCEP-R2 (upper middle),
ERA-40 (upper right),
JRA-25 (lower left),
GSWP2 (lower middle).
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