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TRMM Microwave Imager (TMI) Level 3 Monthly 0.5° x 0.5° Profiling (3A12)


Data Access for

3A12:  http://mirador.gsfc.nasa.gov/cgi-bin/mirador/presentNavigation.pl?tree=project&dataset=3A12%20%28Version%20007%29:%20Monthly%200.5%20x%200.5%20degree%20mean%202A12,%20profile,%20and%20surface%20rainfall&project=TRMM&dataGroup=Gridded&version=007

 


NO swath based latent heating (LH) should be used as is and this includes the roll up in 3A12. Please use the radar or combined LH products.

Contents:

Summary

3A12, "Monthly TMI Pro ling", produces global 0.5 x 0.5 deg monthly gridded means using 2A12 data. Vertical hydrometeor pro les and surface rainfall means are computed. Various pixel counts are also reported.  The granule size is one month. The following sections describe the structure and contents of the format.

Data Flow Description

TMI Level 1A ==> 1B11 Calibrated TMI brightness temperatures ==> 2A12 TMI Rainfall Structure ==> 3A12 Monthly TMI Profiling

The data flow of all products are shown in Satellite Algorithm Flow Diagram.


Data Set Description

3A12 V7 Readme


Data Characteristics

Temporal CoverageStart Date: 1998-01-01; Stop Date: -
Geographic CoverageLatitude: 40°S - 40°N; Longitude:180°W - 180°E
Temporal ResolutionMonthly
Horizontal Resolution0.5° x 0.5°; nlat = 160, nlon = 720
Average File SizeCompressed: ~56 MB
File TypeHDF



Data Format Structure

The following table summarizes the contents and structure of the TMI monthly Profiling (3A12) product. Further information can be found in 

 File Specifications for TRMM Products - Version 7.00

Data Format Structure for 3A12, TMI Monthly Profiling
NameTypeRecord
Size
(byte)
Dim Size
(# of Records)
Scaled
by
RangeUnitDescription
ECS Core MetadataChar Attribute10,000 ----ECS Core Metadata
PS MetadataChar Attribute10,000 ----Product Specific Metadata
GridStructureChar Attribute5,000 ----GridStructure gives the specification of the geometry of the grids.
SurfaceRainFloat SDSnlat*nlon~0.0 ~ 3000.0mm
h-1
The SurfaceRain is the monthly mean of the instantaneous rain rate at the surface in 0.5° x 0.5° boxes from 40°N x 40°S.
SurfacePrecipitationFloat SDS4nlat*nlon~0.0 ~ 3000.0mm
h-1
The monthly mean of the instantaneous precipitation rate at the surface for each grid.
ConvectPrecipitationFloat SDSnlat*nlon~0.0 ~ 3000.0mm
h-1
The ConvectPrecipitation is the monthly mean of the instantaneous convective rain rate at the surface in 0.5° x 0.5° boxes from 40°N x 40°S.
CldWaterFloat SDSnlat*nlon*nlayer~0.0 ~ 10.0g
m-3
The CldWater is the monthly mean of the cloud liquid water content in 0.5° x 0.5° boxes from 40°N x 40°S at each vertical layer.
RainWaterFloat SDSnlat*nlon*nlayer~0.0 ~ 10.0g
m-3
The RainWater is the monthly mean of the precipitation water content in 0.5° x 0.5° boxes from 40°N x 40°S at each vertical layer.
CldIceFloat SDSnlat*nlon*nlayer~0.0 ~ 10.0g
m-3
The CldIce is the monthly mean of the cloud ice water content in 0.5° x 0.5° boxes from 40°N x 40°S at each vertical layer.
SnowFloat SDSnlat*nlon*nlayer~0.0 ~ 10.0g
m-3
The Snow is the monthly mean of the snow liquid content in 0.5° x 0.5° boxes from 40°N x 40°S at each vertical layer.
GraupelFloat SDS4nlat*nlon*nlayer~0.0 ~ 10.0g m-3The Graupel is the monthly mean of the graupel liquid content in 0.5° x 0.5° boxes from 40°N x 40°S at each vertical layer.
LatentHeatFloat SDSnlat*nlon*nlevel~-256 ~ 256deg
h-1
The LatentHead is the monthly mean of the latent heating release in 0.5° x 0.5° boxes from 40°N x 40°S at each vertical level.
NpixTotalInteger SDSnlat*nlon~0 ~ 10,000.0~The NpixTotal is the monthly accumulation of pixels with surface rain greater than or equal to 0.0 (mm h-1) in 0.5° x 0.5° boxes from 40°N x 40°S.
NpixPrecipitationInteger SDSnlat*nlon~0 ~ 10,000.0~The NpixPrecipitation is the monthly accumulation of pixels with surface rain greater than 0.0 (mm h-1) in 0.5° x 0.5° boxes from 40°N x 40°S.
Note:nlevel: the number of latent heating levels (28) per grid box
nlayer: the number of profiling layers (28) per grid box


28 Vertical Profiling Layers
Layer IndexLayer Top Height
10.5 km
21.0 km
31.5 km
42.0 km
52.5 km
63.0 km
73.5 km
84.0 km
94.5 km
105.0 km
115.5 km
126.0 km
136.5 km
147.0 km
157.5 km
168.0 km
178.5 km
189.0 km
199.5 km
2010.0 km
2111.0 km
2212.0 km
2313.0 km
2414.0 km
2515.0 km
2616.0 km
2717.0 km
2818.0 km
28 Latent Heating Levels
Level IndexLevel Top Height
10.5 km
21.0 km
31.5 km
42.0 km
52.5 km
63.0 km
73.5 km
84.0 km
94.5 km
105.0 km
115.5 km
126.0 km
136.5 km
147.0 km
157.5 km
168.0 km
178.5 km
189.0 km
199.5 km
2010.0 km
2111.0 km
2212.0 km
2313.0 km
2414.0 km
2515.0 km
2616.0 km
2717.0 km
2818.0 km

TRMM 3A12 can be accessed and ordered from Mirador,

http://mirador.gsfc.nasa.gov/cgi-bin/mirador/presentNavigation.pl?tree=project&dataset=3A12%20%28Version%20007%29:%20Monthly%200.5%20x%200.5%20degree%20mean%202A12,%20profile,%20and%20surface%20rainfall&project=TRMM&dataGroup=Gridded&version=007

For more information about the data structure, File Specifications for TRMM Products - Version 7.00


Appendix

 

 

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Last updated: Aug 02, 2013 12:20 PM ET
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