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Description

ML2HO2 is the EOS Aura Microwave Limb Sounder (MLS) standard product for hydroperoxy derived from radiances measured in two bands from the 640 GHz radiometer. The data version is 4.2. Spatial coverage is near-global (-82 degrees to +82 degrees latitude), with each profile spaced 1.5 degrees or ~165 km along the orbit track (roughly 15 orbits per day). The recommended useful vertical range is from 21.5 to 0.0464 hPa, and the vertical resolution is about 5 km. Users of the ML2HO2 data product should read section 3.13 of the EOS MLS Level 2 Version 4 Quality Document for more information.

The data are stored in the version 5 EOS Hierarchical Data Format (HDF-EOS5), which is based on the version 5 Hierarchical Data Format, or HDF-5. Each file contains two swath objects (profile and column data), each with a set of data and geolocation fields, swath attributes, and metadata.

Product Summary

Platforms
Aura
Instruments
MLS
Spatial Extent

N: 82 S: -82 E: 180 W: -180

Geographic Region
GLOBAL ,
STRATOSPHERE
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2004-08-02 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
C1251101564-GES_DISC
Data State
ACTIVE
Number of Files/Granules
7174
Processing Level
2
Published
Updated
Science Keywords
Hydroperoxy

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

Wang, S., Pickett, H., Livesey, N., & Read, W. (2015). MLS/Aura L2 Hydroperoxy (HO2) Mixing Ratio - Version 4 [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/MLS/DATA2013 Date Accessed: 2025-12-15

Documents

USER'S GUIDE

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

PUBLICATIONS

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
HDFEOS/SWATHS/HO2-APriori/Data Fields/Convergence HO2-APrioriConvergence NoUnits float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Data Fields/HO2-APriori HO2-APriori vmr float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Data Fields/HO2-APrioriPrecision HO2-APrioriPrecision vmr float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Data Fields/L2gpPrecision HO2-APrioriPrecision vmr float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Data Fields/L2gpValue HO2-APriori vmr float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Data Fields/Quality HO2-APrioriQuality NoUnits float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Data Fields/Status HO2-APrioriStatus NoUnits int32 513 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Geolocation Fields/ChunkNumber ChunkNumber NoUnits int32 -999 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Geolocation Fields/Latitude Latitude deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Geolocation Fields/LineOfSightAngle LineOfSightAngle deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Geolocation Fields/LocalSolarTime LocalSolarTime h float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Geolocation Fields/Longitude Longitude deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Geolocation Fields/OrbitGeodeticAngle OrbitGeodeticAngle deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Geolocation Fields/Pressure Pressure hPa float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Geolocation Fields/SolarZenithAngle SolarZenithAngle deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/Geolocation Fields/Time Time s float64 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2-APriori/nLevels HDFEOS/SWATHS/HO2-APriori/nLevels N/A float32 N/A N/A N/A
HDFEOS/SWATHS/HO2-APriori/nTimes HDFEOS/SWATHS/HO2-APriori/nTimes N/A float32 N/A N/A N/A
HDFEOS/SWATHS/HO2-APriori/nTimesTotal HDFEOS/SWATHS/HO2-APriori/nTimesTotal N/A float32 N/A N/A N/A
HDFEOS/SWATHS/HO2/Data Fields/Convergence HO2Convergence NoUnits float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Data Fields/HO2 HO2 vmr float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Data Fields/HO2Precision HO2Precision vmr float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Data Fields/L2gpPrecision HO2Precision vmr float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Data Fields/L2gpValue HO2 vmr float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Data Fields/Quality HO2Quality NoUnits float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Data Fields/Status HO2Status NoUnits int32 513 N/A N/A
HDFEOS/SWATHS/HO2/Geolocation Fields/ChunkNumber ChunkNumber NoUnits int32 -999 N/A N/A
HDFEOS/SWATHS/HO2/Geolocation Fields/Latitude Latitude deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Geolocation Fields/LineOfSightAngle LineOfSightAngle deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Geolocation Fields/LocalSolarTime LocalSolarTime h float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Geolocation Fields/Longitude Longitude deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Geolocation Fields/OrbitGeodeticAngle OrbitGeodeticAngle deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Geolocation Fields/Pressure Pressure hPa float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Geolocation Fields/SolarZenithAngle SolarZenithAngle deg float32 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/Geolocation Fields/Time Time s float64 -999.98999023438 N/A N/A
HDFEOS/SWATHS/HO2/nLevels HDFEOS/SWATHS/HO2/nLevels N/A float32 N/A N/A N/A
HDFEOS/SWATHS/HO2/nTimes HDFEOS/SWATHS/HO2/nTimes N/A float32 N/A N/A N/A
HDFEOS/SWATHS/HO2/nTimesTotal HDFEOS/SWATHS/HO2/nTimesTotal N/A float32 N/A N/A N/A
HDFEOS INFORMATION/coremetadata.0 HDFEOS INFORMATION/coremetadata.0 N/A OTHER N/A N/A N/A
HDFEOS INFORMATION/StructMetadata.0 HDFEOS INFORMATION/StructMetadata.0 N/A OTHER N/A N/A N/A
HDFEOS INFORMATION/xmlmetadata HDFEOS INFORMATION/xmlmetadata N/A OTHER N/A N/A N/A
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