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Description

This L3 Spectral Outgoing Longwave Radiation (OLR) is derived using the AIRS radiances to compute spectral fluxes based on an algorithm developed by Xianglei Huang at the University of Michigan. It uses data from the Atmospheric InfraRed Sounder (AIRS) instrument on the EOS-Aqua spacecraft.

The Aqua AIRS Huang Level-3 Spectral OLR product contains OLR parameters derived from the AIRS version 6 data: all-sky and clear-sky OLR both spectrally resolved at 10 cm-1 bandwidth and integrated to a single value per grid square. This is monthly product on a 2x2 degree latitude/longitude grid.

Product Summary

Platforms
Aqua
Instruments
AIRS
Spatial Extent

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

Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2002-08-31 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
C1697372449-GES_DISC
Data State
ACTIVE
Number of Files/Granules
244
Processing Level
3
Published
Updated
Science Keywords
Outgoing Longwave Radiation

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

Univ Of Michigan, Huang, X., & AIRS Project At JPL. (2019). Aqua AIRS Level 3 Spectral Outgoing Longwave Radiation (OLR) Monthly [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/5P7KQ31XI7XJ Date Accessed: 2025-12-14

Documents

READ-ME

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
bnds_1d bnds_1d N/A float32 N/A N/A N/A
lat Degrees latitude degrees_north float32 9.9692099683869E+36 -90 to 90 N/A
lat_bnds min and max degrees for each longitude grid cell degrees_north float32 9.9692099683869E+36 -90 to 90 N/A
lon Degrees longitude degrees_east float32 9.9692099683869E+36 -180 to 180 N/A
lon_bnds min and max degrees for each longitude grid cell degrees_east float32 9.9692099683869E+36 -180 to 180 N/A
nobs_nobs_max Maximum number of observations including those for which no value was retrieved 1 int32 -2147483647 N/A N/A
nobs_olr_clr_nobs olr_clr number of observations 1 int32 -2147483647 N/A N/A
nobs_olr_clr_spectral_nobs olr_clr_spectral number of observations 1 int32 -2147483647 N/A N/A
nobs_olr_nobs olr number of observations 1 int32 -2147483647 N/A N/A
nobs_olr_spectral_nobs olr_spectral number of observations 1 int32 -2147483647 N/A N/A
obs_time_tai93 Nominal midtime for observations included in grid seconds since 1993-01-01 00:00 float64 9.9692099683869E+36 -2934835217 to 3376598410 N/A
obs_time_tai93_bnds Nominal start and end time for observations included in grid seconds since 1993-01-01 00:00 float64 9.9692099683869E+36 -2934835217 to 3376598410 N/A
obs_time_utc Nominal midtime for observations included in grid as an array of integers: year, month, day, hour, minute, second, millisec, microsec N/A uint16 65535 N/A N/A
olr outgoing longwave radiation flux integrated over 2 to 2800 cm-1 W / m2 float32 9.9692099683869E+36 1 to 2000 N/A
olr_clr outgoing longwave radiation flux integrated over 2 to 2800 cm-1 where clear-sky W / m2 float32 9.9692099683869E+36 1 to 2000 N/A
olr_clr_spectral Outgoing longwave radiation flux per 10 cm-1 where clear-sky W / m2 float32 9.9692099683869E+36 0.0010000000474975 to 2000 N/A
olr_spectral All-sky outgoing longwave radiation flux per 10 cm-1 W / m2 float32 9.9692099683869E+36 0.0010000000474975 to 2000 N/A
orbit_pass Nominal solar time when the spacecraft passes over the equator. Orbit pass bounds are defined by closest approach of the spacecraft to the poles. hours float32 9.9692099683869E+36 0 to 24 N/A
utc_tuple utc_tuple N/A float32 N/A N/A N/A
utc_tuple_lbl names of the elements of UTC when it is expressed as an array of integers year,month,day,hour,minute,second,millisecond,microsecond N/A string N/A N/A N/A
wnum OLR wavenumber band centers cm-1 float32 9.9692099683869E+36 N/A N/A
wnum_bnds min and max wavenumbers of each OLR band cm-1 float32 9.9692099683869E+36 N/A N/A
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