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Description

This level 2 support product is generated by the SiFSAP (Single Field-of-View Sounder Atmospheric Products) algorithm. The SIFSAP algorithm provides retrieval for each sounder Field of View (FOV), therefore, it has 3-times higher horizontal spatial resolution and 9-time denser products compared to other current IR sounder products. Since SiFSAP is an FOV-based algorithm, its product variables have an additional dimension which represents the number of FOVs. For CrIS instrument, there are 9 FOVs for each Field of Regard (FOR). The SiFSAP Level-2 retrieval products contain a variety of geophysical parameters retrieved from IR/MW sounder suites measurements, including profiles of temperature, water vapor and trace gas species as well as clouds and surface properties. This support product provides height vertical sampling (up to 98 levels) and also includes more detailed Empirical Orthogonal Function (EOF) information like averaging kernels. A level 2 granule has been set as 6 minutes of data. There are 240 granules per day, with an orbit repeat cycle of approximately 16 day.

Product Summary

Platforms
Suomi-NPP
Instruments
ATMS ,
CrIS
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Location
GLOBAL
Coordinate System
GEODETIC
Granule Spatial Representation
GEODETIC
Temporal Extent
2015-11-02
Data Partner
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C2782339991-GES_DISC
Data State
ACTIVE
Number of Files/Granules
460114
Processing Level
2
Published
Updated
Science Keywords
Surface Pressure ,
Surface Temperature ,
Air Temperature ,
Upper Air Temperature ,
Layered Precipitable Water ,
Total Precipitable Water ,
Water Vapor Profiles ,
Skin Temperature ,
Sea Surface Temperature ,
Liquid Water Equivalent ,
Relative Humidity ,
Specific Humidity ,
Atmospheric Ozone ,
Total Ozone ,
Atmospheric Carbon Monoxide ,
Methane ,
Cloud Optical Depth/Thickness ,
Temperature Gradient Rate

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Liu, X. (2022). Sounder SIPS: Suomi NPP CrIMSS Level 2 SiFSAP Support: Atmosphere cloud and surface geophysical state per footprint V2 [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/XQMJMVTQSGIS Date Accessed: 2026-05-14

Documents

READ-ME

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

SCIENCE DATA PRODUCT VALIDATION

Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor Offset
aux/qc_flag Quality Control Flag. Overall quality for the retrieval. 0: chi2_mw, cost_func_ir, and cost_func_mw are all smaller than corresponding threshold values; 1: chi2_mw and cost_func_ir meet the criteria, but cost_func_mw is larger than the desired threshold value but still smaller than a relaxed threshold value; 2: chi2_mw meets the criteria, cost_func_ir does not meet the desired criterion, but meets the criterion defined by a relaxed threshold; 3: cost_func_ir is even larger than the relaxed threshold value; 4: No retrieval was attempted because of bad or missing input data. N/A int16 -32767 N/A N/A N/A
aux/qc_mw_flag Quality control flag for MW-Only retrieval. 0: best; 1: good; 2: lower quality; 3: bad retrieval; 4: bad input data, no retrieval attempted. N/A int16 -32767 N/A N/A N/A
aux/qc_n2o_flag Quality control flag for nitrous oxide. 0: best; 1: good; 2: lower quality; 3: bad retrieval; 4: bad input data, no retrieval attempted. N/A int16 -32767 N/A N/A N/A
aux/qc_o3_flag Quality control flag for ozone. 0: best; 1: good; 2: lower quality; 3: bad retrieval; 4: bad input data, no retrieval attempted. N/A int16 -32767 N/A N/A N/A
aux/surf_ir_emis_num_bad Number of Infrared Surface Emissivity hinge points at which limits were enforced. Zero indicates best quality. 1 int16 -32767 N/A N/A N/A
bndry_lay_status bndry_lay calculation status flag: 0: sea success; 1: sea with pressure grid selected at the end of the allowed values (4000 m or next to bad input data); 4: sea with lowest allowed altitude, 250 m above the surface ; 8: sea with not enough good data; 16: land success; 17: land with pressure grid selected at the end of the allowed values (6000 m or next to bad input data); 20: land with lowest allowed altitude: 250 m above the surface; 24 land with not enough good data. N/A int8 -127 N/A N/A N/A
bndry_lay_thick Geodetic thickness of the planetary boundary layer. This is determined from the maximum smoothed lapse rate of relative humidity over the range of 250-4000 meters over ocean, 250-6000 meters over land. The value is less reliable over land surfaces than ocean. m float32 9.9692099683869E+36 N/A N/A N/A
bndry_lay_thick_qc bndry_lay_thick QC flag N/A int8 -127 N/A N/A N/A
bndry_lay_top Pressure corresponding to bndr_lay_thick Pa float32 9.9692099683869E+36 N/A N/A N/A
bndry_lay_top_qc bndry_lay_top QC flag N/A int8 -127 N/A N/A N/A
bndry_lay_top_rel_hum_lapse_rate The slope of the smoothed relative humidity with respect to altitude at the top of the planetary boundary layer. 1/m float32 9.9692099683869E+36 N/A N/A N/A
bndry_lay_top_rel_hum_lapse_rate_qc bndry_lay_top_rel_hum_lapse_rate QC flag N/A int8 -127 N/A N/A N/A
ch4_dof The trace of the averaging kernel matrix as a measure of the amount of information about the methane profile extracted from the measured radiation. 1 float32 9.9692099683869E+36 N/A N/A N/A
ch4_mmr_midtrop Methane mass mixing ratio to dry air at 40000 Pa, near the peak of sensitivity kg / kg float32 9.9692099683869E+36 N/A N/A N/A
ch4_mmr_midtrop_err ch4_mmr_midtrop error estimate kg / kg float32 9.9692099683869E+36 N/A N/A N/A
ch4_mmr_midtrop_qc ch4_mmr_midtrop QC flag N/A int8 -127 N/A N/A N/A
channel_atms Number for each ATMS channel (1-22) 1 uint16 65535 N/A N/A N/A
cld_eff_radius cloud particle effective radius m float32 9.9692099683869E+36 N/A N/A N/A
cld_eff_radius_dof An element of the averaging kernel matrix as a measure of the amount of information about the cloud particle effective radius provided by the physical retrieval. 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_eff_radius_err cloud particle effective radius error estimate m float32 9.9692099683869E+36 N/A N/A N/A
cld_eff_radius_qc cld_eff_radius QC flag 1 int8 -127 N/A N/A N/A
cld_emis cloud emissivity at 11 microns 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_emis_err cloud emissivity error estimate 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_emis_qc cld_emis QC flag 1 int8 -127 N/A N/A N/A
cld_emis_wlen wavelength for cloud emissivity m float32 9.9692099683869E+36 N/A N/A N/A
cld_optical_depth cloud optical depth at 550 nm 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_optical_depth_dof An element of the averaging kernel matrix as a measure of the amount of information about the cloud optical depth provided by the physical retrieval. 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_optical_depth_err cloud optical depth error estimate 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_optical_depth_qc cld_optical_depth QC flag 1 int8 -127 N/A N/A N/A
cld_optical_depth_wlen wavelength for cloud optical depth m float32 9.9692099683869E+36 N/A N/A N/A
cld_top_pres cloud top pressure Pa float32 9.9692099683869E+36 N/A N/A N/A
cld_top_pres_dof An element of the averaging kernel matrix as a measure of the amount of information about the cloud top pressure provided by the physical retrieval. 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_top_pres_err cloud top pressure error estimate Pa float32 9.9692099683869E+36 N/A N/A N/A
cld_top_pres_qc cloud top pressure QC flag N/A int8 -127 N/A N/A N/A
cld_top_temp cloud top temperature kelvin float32 9.9692099683869E+36 N/A N/A N/A
cld_top_temp_err cloud top temperature error estimate 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_top_temp_qc cld_top_temp QC flag 1 int8 -127 N/A N/A N/A
co2_dof The trace of the averaging kernel matrix as a measure of the amount of information about the carbon dioxide profile extracted from the measured radiation. 1 float32 9.9692099683869E+36 N/A N/A N/A
co2_vmr carbon dioxide profile mean volume mixing ratio. Multiply by 1.0e06 to convert to ppm. m3 / m3 float32 9.9692099683869E+36 N/A N/A N/A
co2_vmr_err co2_vmr error estimate m3 / m3 float32 9.9692099683869E+36 N/A N/A N/A
co2_vmr_qc co2_vmr QC flag N/A int8 -127 N/A N/A N/A
co_dof The trace of the averaging kernel matrix as a measure of the amount of information about the carbon monoxide profile extracted from the measured radiation. 1 float32 9.9692099683869E+36 N/A N/A N/A
co_mmr_midtrop Carbon monoxide mass mixing ratio to dry air at 50000 Pa, near the peak of sensitivity kg / kg float32 9.9692099683869E+36 N/A N/A N/A
co_mmr_midtrop_err co_mmr_midtrop error estimate kg / kg float32 9.9692099683869E+36 N/A N/A N/A
co_mmr_midtrop_qc co_mmr_midtrop QC flag N/A int8 -127 N/A N/A N/A
eigenvec/air_temp_ave_kern Averaging kernel for air temperature retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/air_temp_bkgd Background for air temperature. K float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/air_temp_cov_eigenval Air temperature error covariance in the EOF domain. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/air_temp_eigenval Eigenvalues for air temperature 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/air_temp_eigenvec Eigenvectors for air temperature K float32 9.9692099683869E+36 N/A N/A N/A
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