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SODA 333m Products

Description

The main SODA products are the SODA_AOD which contains the Optical Depth retrievals at 333m, the SODA_AOD-5km with retrievals at 5km classified by cloud or aerosol scenes and the level 3 monthly means. However, several intermediate RADAR/LIDAR intercalibration products are also produced.

SODA_Month-Calibration-Coef

This is the first intermediate SODA product. It contains the monthly based RADAR/LIDAR intercalibration coefficients based on night orbits only

SODA_DN-Recalibration-Coef

It introduces latitudinal calibration correction coefficients for day and night orbits. It manages the variations of the intercalibration along the latitudes.

SODA_AOD

The optical depths retrieved at 333m, based on the Level 1 CALIOP resolution.

File Naming Convention

SODA_Month-Calibration-Coef

SODA_Month-Calibration-Coef_v<Version>_<Year>-<Month>.hdf

SODA_DN-Recalibration-Coef

SODA_DN-Recalibration-Coef_v<Version>_<Year>-<Month>_<Day/Night-Flag>.hdf

SODA_AOD

SODA_AOD_v<Version>_<Orbit-Timestamp>.hdf

<Version> A 3 digits dot separated version number as X.X.X
<Orbit-Timestamp> The timestamp of the orbit, using the CALIPSO format YYYY-MM-SSTHH-MM-SSZ[DN]
<Year> The year, on 4 digits
<Month> The month, on 2 digits starting from "01"
<Day/Night-Flag> A D or N character that tells if the processed orbits are Day or Night ones
<Scenes-ID> Type of scenes processed. Sc_All means no scenes filtering

Variables

SODA_Month-Calibration-Coef

Name Description Unit Type Fill Misc
CPR_Intercalibration_Coefficient RADAR Intercalibration Coefficient None float64 RADAR to LIDAR Intercalibration coefficient
CALIOP_Intercalibration_Coefficient_532 LIDAR Intercalibration Coefficient None float64 LIDAR to RADAR Intercalibration coefficient
RADAR_LIDAR_Intercalibration_Coefficient CPR/CALIOP Intercalibration Coefficients None float64 CPR RADAR/CALIOP LIDAR Intercalibration Coefficients, issued of a polynomial fit

SODA_DN-Recalibration-Coef

Name Description Unit Type Fill Misc
CAL532_Lat_Coef CALIOP 532nm Latitudinal Calibration Correction Coefficient, reference is provided by the CPR TBD float64 Base of CALIOP ocean calibration
CAL1064_Lat_Coef CALIOP 1064nm Latitudinal Calibration Correction Coefficient, reference is provided by the CPR TBD float64 Base of CALIOP ocean calibration
CAL532_AMSR_Lat_Coef CALIOP 532nm Latitudinal Calibration Correction Coefficient, reference is provided by AMSR-E None float64 TBD
CAL1064_AMSR_Lat_Coef CALIOP 1064nm Latitudinal Calibration Correction Coefficient, reference is provided by AMSR-E None float64 TBD
CAL532_1064_Lat_Coef CALIOP 532nm vs 1064nm color ratio Latitudinal dependencies None float64 TBD
CAL_CPR_Lat_Coef CPR and AMSR-E Latitudinal relative dependencies None float64 TBD

SODA_AOD

Name Description Unit Type Fill Misc
Latitude Latitude degrees float32
Longitude Longitude degrees float32
TAI_Time TAI time, using the TAI93 convention seconds float64 Number of seconds since the 1993/01/01 at 00:00:00
Total_Attenuated_Cross_Section_532 Total Attenuated Lidar sea surface scatterring cross section at 532nm sr-1 float32 NaN
Attenuated_Cross_Section_1064 Attenuated Lidar sea surface scatterring cross section at 1064nm sr-1 float32 NaN
Perpendicular_Attenuated_Cross_Section_532 Perpendicular Attenuated Lidar sea surface scatterring cross section at 532nm sr-1 float32 NaN
CPR_Attenuated_Cross_Section CPR Attenuated Radar sea surface scatterring cross section sr-1 float32 NaN
AMSR_E_Surface_Wind_Speed Wind speed 10 meters above the water surface m.s-1 float32 254.0 Extracted from RSS AMSR-E Ocean Products.
0 to 250 = valid geophysical data
251 = missing sst or wind speed due to sun glint;
missing sst or wind speed near sea ice;
missing sst or wind speed due to rain;
missing water vapor due to heavy rain;
missing sst due to high wind speed (> 20 m/s);
missing any due to land proximity
252 = sea ice
253 = observations exist, but are bad
(not used in composite maps)
254 = no observations
255 = land mass
AMSR_E_Atmospheric_Water_Vapor Total gaseous water contained in a vertical column of atmosphere mm float32 254.0 Extracted from RSS AMSR-E Ocean Products.
0 to 250 = valid geophysical data
251 = missing sst or wind speed due to sun glint;
missing sst or wind speed near sea ice;
missing sst or wind speed due to rain;
missing water vapor due to heavy rain;
missing sst due to high wind speed (> 20 m/s);
missing any due to land proximity
252 = sea ice
253 = observations exist, but are bad
(not used in composite maps)
254 = no observations
255 = land mass
AMSR_E_Sea_Surface_Temperature Temperature of the top layer (skin) of water approximately 1 milimeter thick Celsius degrees float32 254.0 Extracted from RSS AMSR-E Ocean Products.
0 to 250 = valid geophysical data
251 = missing sst or wind speed due to sun glint;
missing sst or wind speed near sea ice;
missing sst or wind speed due to rain;
missing water vapor due to heavy rain;
missing sst due to high wind speed (> 20 m/s);
missing any due to land proximity
252 = sea ice
253 = observations exist, but are bad
(not used in composite maps)
254 = no observations
255 = land mass
GMAO_Ozone Ozone number density from GMAO molecules per cubic meter float32 1.e+15 Read in CALIOP L1 product
GMAO_Pressure Pressure from GMAO millibars float32 1.e+15 Read in CALIOP L1 product
GMAO_Temperature Temperature from GMAO Celsius degrees float32 1.e+15 Read in CALIOP L1 product
Optical_Depth_CPR_CAL532 Aerosols Optical Depth over the ocean, retrieved from CPR/CALIOP at 532nm, shot to shot CALIOP resolution retrieval None int16 -32768
Optical_Depth_CPR_CAL1064 Aerosols Optical Depth over the ocean, retrieved from CPR/CALIOP at 1064nm, shot to shot CALIOP resolution retrieval None int16 -32768
Optical_Depth_AMSR_CAL532 Aerosols Optical Depth over the ocean, retrieved from AMSR-E/CALIOP at 532nm, shot to shot CALIOP resolution retrieval None int16 -32768
Optical_Depth_AMSR_CAL1064 Aerosols Optical Depth over the ocean, retrieved from AMSR-E/CALIOP at 1064nm, shot to shot CALIOP resolution retrieval None int16 -32768
Optical_Depth_MODIS_550 Aerosols Optical Depth over the ocean, retrieved from MODIS at 550nm, 10 km retrieval interpolated on the shot to shot CALIOP resolution None int16 -32768
Optical_Depth_MODIS_1064 Aerosols Optical Depth over the ocean, retrieved from MODIS at 1064nm, 10 km retrieval interpolated on the shot to shot CALIOP resolution None int16 -32768
Scene_Flags Scene Description Flags None uint8 0 Flags describing how the scene have been selected for inversion. Bits are numbered from right to left using a little endian coding
0 : water bodies
1 : Backscatter centroid is near the surface
2 : Surface signal is under a defined saturation threshold
Feature_Classification_Flags Feature Classification Flags. At this time, only clear sky scenes are identified. None uint16 0 Flags describing identified aerosols or cloud features. Bits are numbered from right to left using a little endian coding
0 : clear sky
Optical_Depth_QA_Factor Optical depth retrieval quality assurance factor. NOT SET YET None uint8 255 0->very uncertain ; 100->very confident

Calibration

Some of the variables are calibrated to an integer format for saving disk space. For every variables, you will find 2 standard SDS attributes called "scale_factor" and "add_offset". Most of time, the standard HDF formula for scaling raw file values to physical ones is used :

science_value = ( raw_file_value - add_offset ) * scale_factor

Examples

SODA_Month-Calibration-Coef

Product Download
RADAR/LIDAR Intercalibration Coefficients of Aug. 2007 SODA_Month-Calibration-Coef_v1.2.3_2007-08.hdf

SODA_DN-Recalibration-Coef

Product Download
Night orbits latitudinal recalibration correction of Aug. 2007 SODA_DN-Recalibration-Coef_v1.2.3_2007-08_N.hdf
Day orbits latitudinal recalibration correction of Aug. 2007 SODA_DN-Recalibration-Coef_v1.2.3_2007-08_D.hdf

SODA_AOD

Product Download
333m Aerosols Optical Depth of Night Orbit starting on Aug. 01 2007 at 00:10:17 UTC SODA_AOD_v1.2.3_2007-08-01T00-10-17ZN.hdf
333m Aerosols Optical Depth of Day Orbit starting on Aug. 01 2007 at 00:56:47 UTC SODA_AOD_v1.2.3_2007-08-01T00-56-47ZD.hdf