The following table summarizes the contents and structure of the TMI monthly Profiling (3A12) product. Further information can be found in Volume 3 of the File Specifications for TSDIS Products - Level 2 and Level 3
Data Access for3A12: http://disc.sci.gsfc.nasa.gov/data/datapool/TRMM_DP/01_Data_Products/02_Gridded/01_Monthly_Tmi_Prod_3A_12/
| The latent heating products of TRMM 2A12 and 3A12 over ocean surfaces should be regarded as experimental.Please confer first with the algorithm developers (by contacting the GES DISC) when using the latent heating product over ocean.Over-land latent heating estimates from TRMM products 2A12 and 3A12 should not be used, as they have not been evaluated quantitatively or qualitatively. |
Contents:This document provides basic information on 3A12, TMI Monthly 0.5° x 0.5° Profiling. Algorithm 3A12 produces global 0.5° x 0.5° monthly gridded means using 2A12 data. Vertical hydrometeor profiles and surface rainfall means are computed. Various pixel counts are also reported. The granule size is one month. 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
Data Characteristics
| Temporal Coverage | Start Date: 1998-01-01; Stop Date: - |
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| Geographic Coverage | Latitude: 40°S - 40°N; Longitude:180°W - 180°E |
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| Temporal Resolution | Monthly |
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| Horizontal Resolution | 0.5° x 0.5°; nlat = 160, nlon = 720 |
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| Average File Size | Compressed: ~27 MB; Original: ~36 MB |
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| File Type | HDF |
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Data Format Structure
The following table summarizes the contents and structure of the TMI monthly Profiling (3A12) product. Further information can be found in Volume 3 of the File Specifications for TSDIS Products - Level 2 and Level 3 . | Data Format Structure for 3A12, TMI Monthly Profiling |
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| Name | Type | Record
Size
(byte) | Dim Size
(# of Records) | Scaled
by | Range | Unit | Description |
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| ECS Core Metadata | Char Attribute | 10,000 | - | - | - | - | ECS Core Metadata |
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| PS Metadata | Char Attribute | 10,000 | - | - | - | - | Product Specific Metadata |
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| GridStructure | Char Attribute | 5,000 | - | - | - | - | GridStructure gives the specification of the geometry of the grids. |
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| SurfaceRain | Float SDS | 4 | nlat*nlon | ~ | 0.0 ~ 3000.0 | mm
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. |
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| ConvectRain | Float SDS | 4 | nlat*nlon | ~ | 0.0 ~ 3000.0 | mm
h-1 | The ConvectRain 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. |
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| StratiformRain | Float SDS | 4 | nlat*nlon | ~ | 0.0 ~ 3000.0 | mm
h-1 | The StratiformRain is the monthly mean of the instantaneous Stratiform rain rate at the surface in 0.5° x 0.5° boxes from 40°N x 40°S. |
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| CldWater | Float SDS | 4 | nlat*nlon*nlayer | ~ | 0.0 ~ 10.0 | g
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. |
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| PrecipWater | Float SDS | 4 | nlat*nlon*nlayer | ~ | 0.0 ~ 10.0 | g
m-3 | The PrecipWater 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. |
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| CldIce | Float SDS | 4 | nlat*nlon*nlayer | ~ | 0.0 ~ 10.0 | g
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. |
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| PrecipIce | Float SDS | 4 | nlat*nlon*nlayer | ~ | 0.0 ~ 10.0 | g
m-3 | The PrecipIce is the monthly mean of the precipitation ice content in 0.5° x 0.5° boxes from 40°N x 40°S at each vertical layer. |
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| LatentHeat | Float SDS | 4 | nlat*nlon*nlevel | ~ | -256 ~ 256 | deg
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. |
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| NpixTotal | Integer SDS | 4 | nlat*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. |
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| NpixRain | Integer SDS | 4 | nlat*nlon | ~ | 0 ~ 10,000.0 | ~ | The NpixRain 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. |
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| NpixConvectRain | Integer SDS | 4 | nlat*nlon | ~ | 0 ~ 10,000.0 | ~ | The NpixConvectRain is the monthly accumulation of pixels with surface convective rain greater than 0.0 (mm h-1) in 0.5° x 0.5° boxes from 40°N x 40°S. |
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| NpixStratiformRain | Integer SDS | 4 | nlat*nlon | ~ | 0 ~ 10,000.0 | ~ | The NpixStratiformRain is the monthly accumulation of pixels with surface stratiform rain greater than 0.0 (mm h-1) in 0.5° x 0.5° boxes from 40°N x 40°S. |
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| NpixUnclassifiable | Integer SDS | 4 | nlat*nlon | ~ | 0 ~ 10,000.0 | ~ | The NpixUnclassifiable is the monthly accumulation of pixels with surface rain greater than equal to 0.0 (mm h-1) that can not be classified as convective or stratiform in 0.5° x 0.5° boxes from 40°N x 40°S. The pixel counts include ambiguous pixels. |
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| NpixAmbiguous | Integer SDS | 4 | nlat*nlon | ~ | 0 ~ 10,000.0 | ~ | The NpixAmbiguous is the monthly accumulation of pixels with surface rain greater than equal to 0.0 (mm h-1) and rain flag greater than 0 (indicates ambiguous rain) in 0.5° x 0.5° boxes from 40°N x 40°S. |
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| Note: | nlevel: the number of latent heating levels (14) per grid box
nlayer: the number of profiling layers (14) per grid box |
| 14 Vertical Profiling Layers |
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| Layer Index | Layer Height |
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| 1 | surface - 0.5 km | | 2 | 0.5 - 1.0 km | | 3 | 1.0 - 1.5 km | | 4 | 1.5 - 2.0 km | | 5 | 2.0 - 2.5 km | | 6 | 2.5 - 3.0 km | | 7 | 3.0 - 3.5 km | | 8 | 3.5 - 4.0 km | | 9 | 4.0 - 5.0 km | | 10 | 5.0 - 6.0 km | | 11 | 6.0 - 8.0 km | | 12 | 8.0 -10.0 km | | 13 | 10.0 -14.0 km | | 14 | 14.0 - 18.0 km |
| | 14 Latent Heating Levels |
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| Level Index | Level Height |
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| 1 | 0 km | | 2 | 1 km | | 3 | 2 km | | 4 | 3 km | | 5 | 4 km | | 6 | 5 km | | 7 | 6 km | | 8 | 7 km | | 9 | 8 km | | 10 | 9 km | | 11 | 10 km | | 12 | 12 km | | 13 | 14 km | | 14 | 16 km |
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TRMM 3A12 can be accessed and ordered from the Goddard DAAC's TRMM Data Search and Order System at http://disc.sci.gsfc.nasa.gov/data/datapool/TRMM_DP/01_Data_Products/02_Gridded/01_Monthly_Tmi_Prod_3A_12/ .
Appendix |
Atmos Composition
