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Description

This level 2 standard 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 standard product provides retrievals on a reduced vertical profile (11 levels for water profiles and up to 27 for other profile variables). 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
C2782356281-GES_DISC
Data State
ACTIVE
Number of Files/Granules
460006
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 Standard: 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/CTFP72D3K806 Date Accessed: 2026-05-16

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
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
fov_obs_id unique observation identifier for FOV: yyyymmddThhmm.aaSxx.f . Includes gran_id plus 2-digit along-track index (01-45), scene identifier (E=earth, H=hot, C=cold) , 2-digit cross-track index (01-30), and 1-digit FOV number (1-9). N/A OTHER N/A N/A N/A N/A
h2o_liq_dof The trace of the averaging kernel matrix as a measure of the amount of information about cloud liquid water extracted from the measured radiation. 1 float32 9.9692099683869E+36 N/A N/A N/A
h2o_liq_tot total cloud liquid water kg / m2 float32 9.9692099683869E+36 N/A N/A N/A
h2o_liq_tot_err h2o_liq_tot error estimate kg / m2 float32 9.9692099683869E+36 N/A N/A N/A
h2o_liq_tot_qc h2o_liq_tot QC flag N/A int8 -127 N/A N/A N/A
h2o_vap_dof The trace of the averaging kernel matrix as a measure of the amount of information about the water vapor profile extracted from the measured radiation. 1 float32 9.9692099683869E+36 N/A N/A N/A
h2o_vap_tot total precipitable water vapor kg / m2 float32 9.9692099683869E+36 N/A N/A N/A
h2o_vap_tot_err h2o_vap_tot error estimate kg / m2 float32 9.9692099683869E+36 N/A N/A N/A
h2o_vap_tot_qc h2o_vap_tot QC flag N/A int8 -127 N/A N/A N/A
ir_cld_phase Cloud Ice/Water flag from infrared. Clear = 0; liquid water clouds = 1; ice clouds = 2 N/A int16 -32767 N/A N/A N/A
land_frac land fraction over the FOV 1 float32 9.9692099683869E+36 N/A N/A N/A
lat latitude of FOV center degrees_north float32 9.9692099683869E+36 N/A N/A N/A
lat_bnds latitudes of points forming a polygon around the perimeter of the FOV degrees_north float32 9.9692099683869E+36 N/A N/A N/A
lat_geoid latitude of FOV center on the geoid (without terrain correction) degrees_north float32 9.9692099683869E+36 N/A N/A N/A
local_solar_time local apparent solar time in hours from midnight hours float32 9.9692099683869E+36 N/A N/A N/A
lon longitude of FOV center degrees_east float32 9.9692099683869E+36 N/A N/A N/A
lon_bnds longitudes of points forming a polygon around the perimeter of the FOV degrees_east float32 9.9692099683869E+36 N/A N/A N/A
lon_geoid longitude of FOV center on the geoid (without terrain correction) degrees_east float32 9.9692099683869E+36 N/A N/A N/A
mean_anom_wrt_equat spacecraft mean anomaly measured with respect to the ascending node degree float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_air_temp air temperature profile from the MW-Only step kelvin float32 9.9692099683869E+36 N/A N/A N/A
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