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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: 2026-05-15

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
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
mw/mw_air_temp_dof The trace of the averaging kernel matrix as a measure of the amount of information about the air temperature profile extracted from the measured microwave radiation in the MW-only retrieval step. 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_air_temp_err mw_air_temp error estimate kelvin float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_air_temp_qc mw_air_temp QC flag N/A int8 -127 N/A N/A N/A
mw/mw_bndry_lay_status MW 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
mw/mw_bndry_lay_thick Geodetic thickness of the planetary boundary layer from the MW-Only retrieval. 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
mw/mw_bndry_lay_thick_qc mw_bndry_lay_thick QC flag N/A int8 -127 N/A N/A N/A
mw/mw_bndry_lay_top Pressure corresponding to mw_bndr_lay_thick Pa float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_bndry_lay_top_qc mw_bndry_lay_top QC flag N/A int8 -127 N/A N/A N/A
mw/mw_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 from the MW-Only retrieval. 1/m float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_bndry_lay_top_rel_hum_lapse_rate_qc mw_bndry_lay_top_rel_hum_lapse_rate QC flag N/A int8 -127 N/A N/A N/A
mw/mw_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 microwave radiation in the MW-only retrieval step. 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_h2o_liq_tot MW-Only total cloud liquid water kg / m2 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_h2o_liq_tot_err mw_h2o_liq_tot error estimate kg / m2 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_h2o_liq_tot_qc mw_h2o_liq_tot QC flag N/A int8 -127 N/A N/A N/A
mw/mw_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 microwave radiation in the MW-only retrieval step. 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_h2o_vap_tot total precipitable water vapor from the MW-only retrieval step kg / m2 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_h2o_vap_tot_err mw_h2o_vap_tot error estimate kg / m2 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_h2o_vap_tot_qc mw_h2o_vap_tot QC flag N/A int8 -127 N/A N/A N/A
mw/mw_rel_hum relative humidity over equilibrium phase from the MW-Only step 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_rel_hum_err mw_rel_hum error estimate 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_rel_hum_qc mw_rel_hum QC flag N/A int8 -127 N/A N/A N/A
mw/mw_spec_hum mass fraction of water vapor in moist air from the MW-Only retrieval step kg / kg float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_spec_hum_err mw_spec_hum error estimate kg / kg float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_spec_hum_qc mw_spec_hum QC flag N/A int8 -127 N/A N/A N/A
mw/mw_surf_air_temp near-surface air temperature from the MW-Only step (~2 meters above surface) kelvin float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_surf_air_temp_err mw_surf_air_temp error estimate kelvin float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_surf_air_temp_qc mw_surf_air_temp QC flag N/A int8 -127 N/A N/A N/A
mw/mw_surf_mw_emis Microwave surface emissivity from the MW-only retrieval step 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_surf_mw_emis_dof The trace of the averaging kernel matrix as a measure of the amount of information about the surface MW emissivity extracted from the measured microwave radiation in the MW-only retrieval step. 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_surf_mw_emis_err mw_surf_mw_emis error estimate 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_surf_mw_emis_qc mw_surf_mw_emis QC flag N/A int8 -127 N/A N/A N/A
mw/mw_surf_rel_hum relative humidity near the surface over equilibrium phase from the MW-Only step 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_surf_rel_hum_err mw_surf_rel_hum error estimate 1 float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_surf_rel_hum_qc mw_surf_rel_hum QC flag N/A int8 -127 N/A N/A N/A
mw/mw_surf_spec_hum Near-surface mass fraction of water vapor in moist air from the MW-Only retrieval step kg / kg float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_surf_spec_hum_err mw_surf_spec_hum error estimate kg / kg float32 9.9692099683869E+36 N/A N/A N/A
mw/mw_surf_spec_hum_qc mw_surf_spec_hum QC flag N/A int8 -127 N/A N/A N/A
mw/mw_surf_temp radiative temperature of the surface from the MW-Only retrieval kelvin float32 9.9692099683869E+36 N/A N/A N/A
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