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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
eigenvec/ch4_ave_kern Averaging kernel for methane retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/ch4_err_param_val_cov Methane error covariance in the sigmoid parameter domain. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/ch4_param_val Parameter values for methane 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/co2_ave_kern Averaging kernel for carbon dioxide retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/co2_bkgd Background for carbon dioxide. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/co2_cov_eigenval Carbon dioxide error covariance in the EOF domain. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/co2_eigenval Eigenvalues for carbon dioxide 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/co2_eigenvec Eigenvectors for carbon dioxide 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/land_sea_ice_indx 1-based index giving Land/Sea/Ice category for IR surface emissivity EOFs. The Land category includes coast. Ice includes snow on land as well as sea ice. N/A int16 -32767 N/A N/A N/A
eigenvec/land_sea_ice_lbl Land/Sea/Sea_Ice category for IR surface emissivity EOFs. The Land category includes coast. N/A OTHER N/A N/A N/A N/A
eigenvec/land_sea_indx 1-based index giving Land/Sea category for temperature, water vapor, and ozone EOFs. The Land category includes coast and sea ice. N/A int16 -32767 N/A N/A N/A
eigenvec/land_sea_lbl Land/Sea category for temperature, water vapor, and ozone EOFs. The Land category includes coast and sea ice. N/A OTHER N/A N/A N/A N/A
eigenvec/log_co_ave_kern Averaging kernel for carbon monoxide retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/log_co_bkgd Background for carbon monoxide. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/log_co_cov_eigenval Carbon monoxide error covariance in the EOF domain. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/log_co_eigenval Eigenvalues for carbon monoxide 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/log_co_eigenvec Eigenvectors for carbon monoxide 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/log_h2o_vap_ave_kern Averaging kernel for water vapor retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/log_h2o_vap_bkgd Background for water vapor. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/log_h2o_vap_cov_eigenval Water vapor error covariance in the EOF domain. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/log_h2o_vap_eigenval Eigenvalues for water vapor 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/log_h2o_vap_eigenvec Eigenvectors for water vapor 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/mw_air_temp_ave_kern Averaging kernel for air temperature retrieval from the MW-Only retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/mw_air_temp_eigenval Eigenvalues for air temperature from the MW-Only retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/mw_log_h2o_vap_ave_kern Averaging kernel for water vapor retrieval in the MW-Only retrieval. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/mw_log_h2o_vap_cov_eigenval Water vapor error covariance in the EOF domain from the MW-Only retrieval. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/mw_log_h2o_vap_eigenval Eigenvalues for water vapor from the MW-only retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/n2o_ave_kern Averaging kernel for nitrous oxide retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/n2o_err_param_val_cov Nitrous oxide error covariance in the sigmoid parameter domain. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/n2o_param_val Parameter values for nitrous oxide (Experimental) 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/sigmoid_param_lbl Parameters for pseudo-sigmoid vertical structure of N2O and CH4: near-surface mixing ratio, tropopause proxy, stratospheric decrement rate N/A OTHER N/A N/A N/A N/A
eigenvec/sqrt_o3_ave_kern Averaging kernel for ozone retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/sqrt_o3_bkgd Background for ozone. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/sqrt_o3_cov_eigenval Ozone error covariance in the EOF domain. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/sqrt_o3_eigenval Eigenvalues for ozone 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/sqrt_o3_eigenvec Eigenvectors for ozone 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/surf_ir_emis_ave_kern Averaging kernel for surface IR emissivity retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/surf_ir_emis_bkgd Background for surface IR emissivity. 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/surf_ir_emis_eigenval Eigenvalues for surface IR emissivity 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/surf_ir_emis_eigenvec Eigenvectors for surface IR emissivity 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/surf_ir_emis_err_eigenval Eigenvalues for surface IR emissivity error estimate 1.0f float32 9.9692099683869E+36 N/A N/A N/A
eigenvec/surf_wnum_ir_fine Surface infrared emissivity wavenumbers on the fine grid used in surf_ir_emis_bkgd, surf_ir_emis_eigenvec (hinge points) cm-1 float32 9.9692099683869E+36 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
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