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Description

WARNING: To users of the derived product “co_mmr_midtrop” (carbon monoxide mass mixing ratio to dry air [kg/kg] at ~500 hPa). This variable has a significant bias due to a conversion error: the molecular weight of carbon dioxide (CO2, 44.01 g/mol) was used instead of carbon monoxide (CO, 28.01 g/mol). To correct, simply multiply “co_mmr_midtrop” by 28.01/44.01. Alternatively, derive a profile of mass mixing ratio from scratch using the retrieved column density values (“mol_lay/co_mol_lay”) in the Level 2 files. For further questions or concerns please contact the Sounder SIPS at: sounder.sips@jpl.nasa.gov

The CLIMCAPS (Community Long-term Infrared Microwave Coupled Product System) algorithm is used to analyze data from the Cross-track Infrared Sounder/Advanced Technology Microwave Sounder (CrIS/ATMS) instruments, also known as CrIMSS (Cross-track Infrared and Microwave Sounding Suite). The CrIS/ATMS instruments used for this product are on board the Suomi National Polar-orbiting Partnership (SNPP) platform and use the Full Spectral Resolution (FSR) data. The CrIS instrument is a Fourier transform spectrometer with a total of 2211 FSR infrared sounding channels covering the longwave (645-1095 cm-1), midwave (1210-1750 cm-1), and shortwave (2000-2550 cm-1) spectral regions. The ATMS instrument is a cross-track scanner with 22 channels in spectral bands from 23 GHz through 183 GHz.

The CLIMCAPS algorithm uses an Optimal Estimation methodology and uses an a-priori first guess to start the process. A CLIMCAPS sounding is comprised of a set of parameters that characterizes the full atmospheric state and includes a variety of geophysical parameters derived from the CrIMSS data. These include surface temperature and infrared emissivity; full atmosphere profiles of temperature, water vapor and ozone; infrared effective cloud top characteristics; carbon monoxide, methane, carbon dioxide, sulfur dioxide, nitrous oxide, and nitric acid.

A level 2 granule has been set as 6 minutes of data, 30 footprints cross track by 45 lines along track. There are 240 granules per day, with an orbit repeat cycle of approximately 16 day.

The CLIMCAPS algorithm uses data from the second Modern-Era Retrospective analysis for Research and Applications (MERRA-2) as a first-guess for the atmospheric state. Because MERRA-2 products typically have a latency from 3 to 7 weeks, so too do the CLIMCAPS products.

Product Summary

Platforms
Suomi-NPP
Instruments
CrIS ,
ATMS
Spatial Extent

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

Location
GLOBAL
Coordinate System
GEODETIC
Granule Spatial Representation
GEODETIC
Temporal Extent
2015-11-02 to Present
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
C1692982075-GES_DISC
Data State
ACTIVE
Number of Files/Granules
459480
Processing Level
2
Published
Updated
Science Keywords
Tropospheric Ozone ,
Tropopause ,
Atmospheric Chemistry ,
Carbon And Hydrocarbon Compounds ,
Methane ,
Outgoing Longwave Radiation ,
Atmospheric Temperature ,
Surface Temperature ,
Air Temperature ,
Skin Temperature ,
Upper Air Temperature ,
Vertical Profiles ,
Atmospheric Water Vapor ,
Layered Precipitable Water ,
Total Precipitable Water ,
Cloud Properties ,
Cloud Fraction ,
Cloud Top Temperature ,
Precipitation ,
Skin Temperature ,
Ocean Temperature ,
Sea Surface Skin Temperature

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

Sounder SIPS, & Barnet, C. (2020). Sounder SIPS: Suomi NPP CrIMSS Level 2 CLIMCAPS Full Spectral Resolution: Atmosphere cloud and surface geophysical state V2 [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/62SPJFQW5Q9B Date Accessed: 2026-05-14

Documents

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
ave_kern/co2_func_last_indx Last valid index for all quantities with dimension co2_func_pres for a given profile. Any further basis functions would be cut off by the surface. Zero when the entire ave_kern matrix is invalid. 1s int16 -32767 N/A N/A N/A
ave_kern/co2_func_pres Static mean pressures for each vertical basis function used to represent the carbon dioxide profile. Pa float32 9.9692099683869E+36 N/A N/A N/A
ave_kern/co_ave_kern Averaging kernel for carbon monoxide retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
ave_kern/co_func_hbot Flag if the bottom carbon monoxide trapezoidal basis function has value of 1/2 or 1 at 110000 Pa. N/A int16 -32767 N/A N/A N/A
ave_kern/co_func_htop Flag if the top carbon monoxide trapezoidal basis function has value of 1/2 or 1 at TOA. N/A int16 -32767 N/A N/A N/A
ave_kern/co_func_indxs Pressure indexes defining the trapezoidal basis functions for the carbon monoxide profile 1s int16 -32767 N/A N/A N/A
ave_kern/co_func_last_indx Last valid index for all quantities with dimension co_func_pres for a given profile. Any further basis functions would be cut off by the surface. Zero when the entire ave_kern matrix is invalid. 1s int16 -32767 N/A N/A N/A
ave_kern/co_func_pres Static mean pressures for each vertical basis function used to represent the carbon monoxide profile. Pa float32 9.9692099683869E+36 N/A N/A N/A
ave_kern/h2o_vap_ave_kern Averaging kernel for water vapor retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
ave_kern/h2o_vap_func_hbot Flag if the bottom water_vapor trapezoidal basis function has value of 1/2 or 1 at 110000 Pa. N/A int16 -32767 N/A N/A N/A
ave_kern/h2o_vap_func_htop Flag if the top water vapor trapezoidal basis function has value of 1/2 or 1 at TOA. N/A int16 -32767 N/A N/A N/A
ave_kern/h2o_vap_func_indxs Pressure indexes defining the trapezoidal basis functions for the water vapor profile 1s int16 -32767 N/A N/A N/A
ave_kern/h2o_vap_func_last_indx Last valid index for all quantities with dimension h2o_vap_func_pres for a given profile. Any further basis functions would be cut off by the surface. Zero when the entire ave_kern matrix is invalid. 1s int16 -32767 N/A N/A N/A
ave_kern/h2o_vap_func_pres Static mean pressures for each vertical basis function used to represent the water vapor profile. Pa float32 9.9692099683869E+36 N/A N/A N/A
ave_kern/hno3_ave_kern Averaging kernel for nitric acid retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
ave_kern/hno3_func_hbot Flag if the bottom nitric acid trapezoidal basis function has value of 1/2 or 1 at 110000 Pa. N/A int16 -32767 N/A N/A N/A
ave_kern/hno3_func_htop Flag if the top nitric acid trapezoidal basis function has value of 1/2 or 1 at TOA. N/A int16 -32767 N/A N/A N/A
ave_kern/hno3_func_indxs Pressure indexes defining the trapezoidal basis functions for the nitric acid profile 1s int16 -32767 N/A N/A N/A
ave_kern/hno3_func_last_indx Last valid index for all quantities with dimension hno3_func_pres for a given profile. Any further basis functions would be cut off by the surface. Zero when the entire ave_kern matrix is invalid. 1s int16 -32767 N/A N/A N/A
ave_kern/hno3_func_pres Static mean pressures for each vertical basis function used to represent the nitric acid profile. Pa float32 9.9692099683869E+36 N/A N/A N/A
ave_kern/o3_ave_kern Averaging kernel for ozone retrieval 1.0f float32 9.9692099683869E+36 N/A N/A N/A
ave_kern/o3_func_hbot Flag if the bottom ozone trapezoidal basis function has value of 1/2 or 1 at 110000 Pa. N/A int16 -32767 N/A N/A N/A
ave_kern/o3_func_htop Flag if the top ozone trapezoidal basis function has value of 1/2 or 1 at TOA. N/A int16 -32767 N/A N/A N/A
ave_kern/o3_func_indxs Pressure indexes defining the trapezoidal basis functions for the ozone profile 1s int16 -32767 N/A N/A N/A
ave_kern/o3_func_last_indx Last valid index for all quantities with dimension o3_func_pres for a given profile. Any further basis functions would be cut off by the surface. Zero when the entire ave_kern matrix is invalid. 1s int16 -32767 N/A N/A N/A
ave_kern/o3_func_pres Static mean pressures for each vertical basis function used to represent the ozone profile. Pa float32 9.9692099683869E+36 N/A N/A N/A
ch4_dof The trace of the averaging kernel matrix as a measure of the number of pieces of information about the methane profile provided by the physical retrieval step. 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 1 float32 9.9692099683869E+36 N/A N/A N/A
ch4_mmr_midtrop_err ch4_mmr_midtrop error estimate 1 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
cld_frac effective cloud fraction 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_frac_err effective cloud fraction error estimate 1 float32 9.9692099683869E+36 N/A N/A N/A
cld_frac_qc effective cloud fraction QC flag N/A int8 -127 N/A N/A N/A
cld_lay_lbl Cloud layer {top, bottom} N/A OTHER N/A N/A N/A N/A
cld_top_pres cloud top pressure in order of increasing pressure Pa float32 9.9692099683869E+36 N/A N/A N/A
cld_top_pres_err cloud top pressure error estimate 1 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 cloud top temperature QC flag N/A int8 -127 N/A N/A N/A
co2_dof The trace of the averaging kernel matrix as a measure of the number of pieces of information about the carbon dioxide profile provided by the physical retrieval step. 1 float32 9.9692099683869E+36 N/A N/A N/A
co_dof The trace of the averaging kernel matrix as a measure of the number of pieces of information about the carbon monoxide profile provided by the physical retrieval step. 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 1 float32 9.9692099683869E+36 N/A N/A N/A
co_mmr_midtrop_err co_mmr_midtrop error estimate 1 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_land_frac land fraction over the FOV 1 float32 9.9692099683869E+36 N/A N/A N/A
fov_lat latitude of FOV center degrees_north float32 9.9692099683869E+36 N/A N/A N/A
fov_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
fov_lon longitude of FOV center degrees_east float32 9.9692099683869E+36 N/A N/A N/A
fov_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
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