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Description

The Climate Fingerprinting Sounder Product (ClimFiSP) Version 2 provides Level 3 daily and monthly atmospheric data including temperature profiles, water vapor, ozone, cloud properties, as well as surface properties, including skin temperature and emissivity. Data are available on a ½ by ½ degree grid. These geophysical variables are derived, via the ClimFiSP retrieval algorithm, from the Climate Hyperspectral Infrared Radiance Product (CHIRP), a Level 1 radiance product that harmonizes measurements from three different infrared sounding instruments: the AIRS sensor on EOS-Aqua and the CrIS sensors on the Suomi-NPP and NOAA-20 (JPSS-1) satellites. All three platforms follow similar sun-synchronous orbits, with CLIMFISP daily records including data for both the ascending (1:30 p.m.) and descending (1:30 a.m.) orbit passes. ClimFISP retrievals derived from each instrument are provided separately to facilitate detection of potential radiance biases between the CHIRP-AIRS and CHIRP-CrIS data records, and to evaluate their impact on the long-term data record formed by merging AIRS and CrIS data.

Version Description

This is the first and only version of this dataset available at the GES DISC.

Product Summary

Platforms
Aqua
Instruments
AIRS
Projects
Aqua
Spatial Extent

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

Spatial Resolution
0.5 Decimal Degrees x 0.5 Decimal Degrees
Location
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2002-08-30 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
C3892818620-GES_DISC
Data State
ACTIVE
Number of Files/Granules
278
Processing Level
3
Published
Updated
Science Keywords
Tropospheric Ozone ,
Tropopause ,
Methane ,
Atmospheric Ozone ,
Surface Pressure ,
Outgoing Longwave Radiation ,
Surface Temperature ,
Air Temperature ,
Upper Air Temperature ,
Layered Precipitable Water ,
Total Precipitable Water ,
Water Vapor Profiles ,
Cloud Fraction ,
Cloud Top Pressure ,
Cloud Top Temperature ,
Cloud Vertical Distribution ,
Precipitation Rate ,
Emissivity ,
Skin Temperature ,
Sea Surface 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

Liu, X. (2026). Sounder SIPS: EOS-Aqua AIRS Level 3 Climate Fingerprinting Sounder Product (ClimFiSP) Monthly: Gridded Atmosphere, cloud, and surface geophysical state V2 [Dataset]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/526OQMFV8VI4 Date Accessed: 2026-08-27

Documents

READ-ME

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

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
air_pres pressure levels Pa float32 9.9692099683869E+36 N/A N/A N/A
air_temp air temperature profile on 98 levels kelvin float32 9.9692099683869E+36 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_wnum_ir Infrared cloud emissivity frequencies cm-1 float32 9.9692099683869E+36 N/A N/A N/A
co_mmr Carbon Monoxide mass mixing ratio to dry air kg / kg 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
ice_cld_eff_radius cloud particle effective radius m float32 9.9692099683869E+36 N/A N/A N/A
ice_cld_emis Emissivity from ice clouds. 1 float32 9.9692099683869E+36 N/A N/A N/A
ice_cld_optical_depth_lin_mean Cloud optical depth at 550 nm for ice clouds, calculated as a simple mean 1 float32 9.9692099683869E+36 N/A N/A N/A
ice_cld_optical_depth_log_mean Cloud optical depth at 550 nm for ice clouds, calculated as the mean in log space 1 float32 9.9692099683869E+36 N/A N/A N/A
ice_cld_top_pres Cloud top pressure for ice clouds. Pa float32 9.9692099683869E+36 N/A N/A N/A
ice_cld_top_temp Cloud top temperature for ice clouds. kelvin float32 9.9692099683869E+36 N/A N/A N/A
land_frac land area fraction 1 float32 9.9692099683869E+36 N/A N/A N/A
lat Degrees latitude degrees_north float32 9.9692099683869E+36 N/A N/A N/A
lat_bnds min and max degrees for each longitude grid cell degrees_north float32 9.9692099683869E+36 N/A N/A N/A
liq_cld_eff_radius cloud particle effective radius m float32 9.9692099683869E+36 N/A N/A N/A
liq_cld_emis Emissivity from liquid clouds. 1 float32 9.9692099683869E+36 N/A N/A N/A
liq_cld_optical_depth_lin_mean Cloud optical depth at 550 nm for liquid clouds, calculated as a simple mean 1 float32 9.9692099683869E+36 N/A N/A N/A
liq_cld_optical_depth_log_mean Cloud optical depth at 550 nm for liquid clouds, calculated as the mean in log space 1 float32 9.9692099683869E+36 N/A N/A N/A
liq_cld_top_pres Cloud top pressure for liquid clouds. Pa float32 9.9692099683869E+36 N/A N/A N/A
liq_cld_top_temp Cloud top temperature for liquid clouds. kelvin float32 9.9692099683869E+36 N/A N/A N/A
lon Degrees longitude degrees_east float32 9.9692099683869E+36 N/A N/A N/A
lon_bnds min and max degrees for each longitude grid cell degrees_east float32 9.9692099683869E+36 N/A N/A N/A
nobs/air_temp_nobs air_temp number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/co_mmr_nobs co_mmr number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/h2o_vap_tot_nobs h2o_vap_tot number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/ice_cld_eff_radius_nobs ice_cld_eff_radius number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/ice_cld_emis_nobs ice_cld_emis number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/ice_cld_optical_depth_lin_mean_nobs ice_cld_optical_depth_lin_mean number of observations, including observations with any phase clouds or no clouds 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/ice_cld_optical_depth_log_mean_nobs ice_cld_optical_depth_log_mean number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/ice_cld_top_pres_nobs ice_cld_top_pres number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/ice_cld_top_temp_nobs ice_cld_top_temp number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/liq_cld_eff_radius_nobs liq_cld_eff_radius number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/liq_cld_emis_nobs liq_cld_emis number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/liq_cld_optical_depth_lin_mean_nobs liq_cld_optical_depth_lin_mean number of observations, including observations with any phase clouds or no clouds 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/liq_cld_optical_depth_log_mean_nobs liq_cld_optical_depth_log_mean number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/liq_cld_top_pres_nobs liq_cld_top_pres number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/liq_cld_top_temp_nobs liq_cld_top_temp number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/nobs_max Maximum number of observations including those for which no value was retrieved. Can be used with *_nobs to calculate yield. 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/o3_mmr_nobs o3_mmr number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/o3_tot_nobs o3_tot number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/prior_surf_pres_nobs prior_surf_pres number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/rel_hum_nobs rel_hum number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/spec_hum_nobs spec_hum number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/surf_air_temp_nobs surf_air_temp number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/surf_alt_nobs surf_alt number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/surf_ir_emis_nobs surf_ir_emis number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
nobs/surf_temp_nobs surf_temp number of observations 1 float32 9.9692099683869E+36 N/A N/A N/A
o3_mmr Ozone mass mixing ratio to dry air kg / kg float32 9.9692099683869E+36 N/A N/A N/A
o3_tot Total column ozone. (Multiply by 4.670e4 to convert to Dobson Units from kg m^-2) kg / m2 float32 9.9692099683869E+36 N/A N/A N/A
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