UARS Halogen Occultation Experiment (HALOE) Level 3AT V019 (UARHA3AT) at GES DISC

Metadata Updated: August 1, 2018

The Halogen Occultation Experiment (HALOE) Level 3AT data product consists of daily vertical profiles of temperature, aerosol extinction and concentrations of HCl, HF, CH4, NO by gas filter correlation radiometry and H2O, NO2, O3 by broadband filter radiometry. The instrument measured atmospheric infrared absorption at wavelengths from 2.43 to 10.25 microns. HALOE was flown on NASA's Upper Atmosphere Research Satellite (UARS) to investigate upper atmosphere chemistry, dynamics and radiative processes, particlarly stratospheric ozone destruction and chlorofluromethane impact on ozone. HALOE is a solar occultation experiment which typically views 15 sunrise and sunset events each day. Limb measurements were made in the altitude range between 15 km and 60 - 130 km (depending on channel) with about 2.5 km resolution. For a given day, the profiles were in two distinct latitude bands, for the sunset and sunrise events. Coverage across the full range of latitudes between 80S and 80N was achieved on a time period ranging from about two to six weeks, depending on the time of year. The HALOE Level 3AT data were processed with the version 19 algorithm. The HALOE level 3AT product consists of 13 granules per day. A data granule is one HALOE species or subtype per day. The following subtypes are available: 1) AEXTCH4 - aerosol extinction at 3.46 um (CH4 gas filter) [1/km] 2) AEXTCO2 - aerosol extinction at 2.80 um (CO2 gas filter) [1/km] 3) AEXTHCL - aerosol extinction at 3.40 um (HCL gas filter) [1/km] 4) AEXTHF - aerosol extinction at 2.45 um (HF gas filter) [1/km] 5) AEXTNO - aerosol extinction at 5.26 um (NO gas filter) [1/km] 6) CH4 - methane [vmr] 7) H2O - water vapor [vmr] 8) HCL - hydrogen chloride [vmr] 9) HF - hydrogen fluoride [vmr] 10) NO - nitric oxide [vmr] 11) NO2 - nitrogen dioxide [vmr] 12) O3 - ozone [vmr] 13) TEMP - atmospheric temperature [Kelvin] *vmr = volume mixing ratioHALOE data are on the UARS standard pressure levels (in mbars) given by: P(i) = 1000 * 10(-i/6) for i = 0, 1, 2, ... 54Each of the 13 HALOE granules is accompanied by 2 additional parameter files, designated as level 3TP. The first parameter file, subtype LAT, contains the latitude values for each pressure level of each event for the day. The second parameter file, subtype LON, contains the longitude values. The level 3AT files only contain the latitude/longitude location corresponding to the 30 km retrieval point. The data files are available in a binary record oriented format.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date August 1, 2018
Metadata Updated Date August 1, 2018

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date August 1, 2018
Unique Identifier C1273348584-GES_DISC
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context
Schema Version
Catalog Describedby
Harvest Object Id 32703aa2-807e-4b51-bc2f-d35f9349c27d
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 1998-05-08T00:00:00.000Z
Homepage URL
Language en-US
Metadata Type geospatial
Data Last Modified 1998-05-08T00:00:00.000Z
Program Code 026:001
Publisher Hierarchy U.S. Government > National Aeronautics and Space Administration > NASA/GSFC/SED/ESD/GCDC/GESDISC
Related Documents,,,,,
Source Datajson Identifier True
Source Hash fa1c91d87e10eb612b8451fc558623a53e10a418
Source Schema Version 1.1
Spatial -180.0 -80.0 180.0 80.0
Temporal 1991-10-11T00:00:00Z/2001-09-24T23:59:59Z
Category UARS, geospatial

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