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Description

The Spectro-polarimeter for Planetary Exploration one (SPEXone) instrument flying aboard the PACE spacecraft is a multi-angle polarimeter. It measures the intensity, Degree of Linear Polarization (DoLP) and Angle of Linear Polarization (AoLP) of sunlight reflected back from Earth's atmosphere, land surface, and ocean. The focus of the SPEXone development is to achieve a very high accuracy of DoLP measurements, which facilitates accurate characterization of aerosols in the atmosphere. The Ocean Biology DAAC produces near real-time (quicklook) products using the best-available combination of ancillary data from meteorological and ozone data. As such, the inputs and the calibration used are less than optimal. Quicklook products provide a snapshot of the data during a short time period within a single orbit.

Version Description

Reprocessing of Ocean Color (OC) Datasets

Product Summary

Platforms
PACE
Instruments
SPEXone
Spatial Extent

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

Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2024-02-25 to Present
Data Partner
Ocean Biology Processing Group (OBPG) ,
Ocean Biology Distributed Active Archive Center (OB.DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/GCDC/OB.DAAC)
Concept ID
C3652817414-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
19685
Processing Level
2
Published
Updated
Science Keywords
Aerosol Particle Properties

Documents

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
diagnostic_data/chi2 Cost function value N/A float32 -32767 N/A N/A
diagnostic_data/chi2_first_guess Cost function value of the first guess N/A float32 -32767 N/A N/A
diagnostic_data/mask_dolp Adaptive data mask for DoLP (0:clear, 1: masked) N/A int8 -1 N/A N/A
diagnostic_data/mask_ref Adaptive data mask for reflectance (0:clear, 1: masked) N/A int8 -1 N/A N/A
diagnostic_data/nfev Number of forward calculations N/A int32 -32767 N/A N/A
diagnostic_data/njev Number of Jacobian calculations N/A int32 -32767 N/A N/A
diagnostic_data/nv_dolp Number of angles for DoLP N/A int32 -32767 N/A N/A
diagnostic_data/nv_ref Number of angles for reflectance N/A int32 -32767 N/A N/A
diagnostic_data/ozone Ancillary ozone column density Dobson float32 -32767 N/A N/A
diagnostic_data/quality_flag Quality flag, 0: best, others with lower quality N/A int32 -32767 N/A N/A
diagnostic_data/surface_pressure Ancillary surface pressure mb float32 -32767 N/A N/A
diagnostic_data/timing Retrieval time per pixel N/A float32 -32767 N/A N/A
geolocation_data/latitude Latitude degrees_north float32 -32767 N/A N/A
geolocation_data/longitude Longitude degrees_east float32 -32767 N/A N/A
geophysical_data/alh Aerosol layer height km float32 -32767 N/A N/A
geophysical_data/angstrom_440_670 Aerosol Angstrom exponent, 440 to 670 nm N/A float32 -32767 N/A N/A
geophysical_data/angstrom_440_870 Aerosol Angstrom exponent, 440 to 870 nm N/A float32 -32767 N/A N/A
geophysical_data/aot Aerosol optical thickness N/A float32 -32767 N/A N/A
geophysical_data/aot_coarse Aerosol optical thickness (coarse mode) N/A float32 -32767 N/A N/A
geophysical_data/aot_fine Aerosol optical thickness (fine mode) N/A float32 -32767 N/A N/A
geophysical_data/chla Chlorophyll-a concentration mg m^-3 float32 -32767 N/A N/A
geophysical_data/fmf Aerosol fine mode fraction ( aot_fine/aot) N/A float32 -32767 N/A N/A
geophysical_data/fvf Aerosol fine mode volume fraction (vd_fine/vd) N/A float32 -32767 N/A N/A
geophysical_data/mi Spectral aerosol refractive index (mode average, imaginary part) N/A float32 -32767 N/A N/A
geophysical_data/mi_coarse Spectral aerosol refractive index (coarse mode, imaginary part) N/A float32 -32767 N/A N/A
geophysical_data/mi_fine Spectral aerosol refractive index (fine mode, imaginary part) N/A float32 -32767 N/A N/A
geophysical_data/mr Spectral aerosol refractive index (mode average, real part) N/A float32 -32767 N/A N/A
geophysical_data/mr_coarse Spectral aerosol refractive index (coarse mode, real part) N/A float32 -32767 N/A N/A
geophysical_data/mr_fine Spectral aerosol refractive index (fine mode, real part) N/A float32 -32767 N/A N/A
geophysical_data/reff_coarse Aerosol effective radius (coarse mode) um float32 -32767 N/A N/A
geophysical_data/reff_fine Aerosol effective radius (fine mode) um float32 -32767 N/A N/A
geophysical_data/Rrs1 Angular remote sensing reflectance (after atmospheric correction and transmittance correction) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs1_mean Remote sensing reflectance (angular mean on Rrs1) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs1_std Remote sensing reflectance (angular standard deviation on Rrs1) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs2 Angular remote sensing reflectance (after BRDF correction on Rrs1) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs2_mean Remote sensing reflectance (angular mean on Rrs2) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs2_std Remote sensing reflectance (angular standard deviation on Rrs2) sr^-1 float32 -32767 N/A N/A
geophysical_data/sph Aerosol spherical fraction (volume density weighted) N/A float32 -32767 N/A N/A
geophysical_data/sph_coarse Aerosol spherical fraction (coarse mode) N/A float32 -32767 N/A N/A
geophysical_data/sph_fine Aerosol spherical fraction (fine mode) N/A float32 -32767 N/A N/A
geophysical_data/ssa Aerosol single scattering albedo (total) N/A float32 -32767 N/A N/A
geophysical_data/ssa_coarse Aerosol single scattering albedo (coarse mode) N/A float32 -32767 N/A N/A
geophysical_data/ssa_fine Aerosol single scattering albedo (fine mode) N/A float32 -32767 N/A N/A
geophysical_data/vd Aerosol volume density (total) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_coarse Aerosol volume density (coarse mode) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_fine Aerosol volume density (fine mode) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_mode1 Aerosol volume density (submode 1) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_mode2 Aerosol volume density (submode 2) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_mode3 Aerosol volume density (submode 3) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_mode4 Aerosol volume density (submode 4) um^3 um^-2 float32 -32767 N/A N/A
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