UARS Microwave Limb Sounder (MLS) Level 3AL V005 (UARML3AL) at GES DISC

The Microwave Limb Sounder (MLS) Level 3AL data product consists of daily, 4 degree increment latitude-ordered vertical profiles of temperature, geopotential height, concentrations of O3, H2O, CH3CN, ClO, HNO3, and SO2. The insrument measures in the microwave spectral region at frequencies of 63, 183 and 205 GHz. MLS was flown on NASA's Upper Atmosphere Research Satellite (UARS) and designed to measure the chemical composition of the stratosphere and mesosphere, relationship between chlorine monoxide and ozone destruction. Limb measurements were made in the altitude range between 10 and 85 km at about 2.5 km resolution. Data were collected between latitude 34S and 80N and 80S and 34N, alternating each satellite yaw cycle of about 36 days. The MLS Level 3AL data were processed with the version 5 algorithm, except SO2 which remained version 4. Note: H2O and O3 at 183 GHz data are available only through April 15, 1993 when the 183 GHz radiometer failed.

The MLS level 3AL product consists of 9 granules per day. A data granule is one MLS species or subtype per day.

Data are on the UARS standard pressure levels (in mbars) given by:

P(i) = 1000 * 10**(-i/6) for i = 0, 1, 2, ...

Each of the 9 MLS granules is accompanied by an additional parameter file, designated as level 3LP. The parameter file, contains the additional ancillary and quality information, as well as total column amounts not found in the 3AL files. The data files are available in a binary record oriented format.

Data and Resources

Additional Info

Field Value
Maintainer JAMES JOHNSON
Last Updated March 31, 2025, 15:12 (UTC)
Created March 31, 2025, 15:12 (UTC)
accessLevel public
bureauCode {026:00}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://data.nasa.gov/data.json
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citation Waters, Joe W., et al.. 2001-01-09. UARML3AL. Version 005. UARS Microwave Limb Sounder (MLS) Level 3AL V005. Greenbelt, MD, USA. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). https://disc.gsfc.nasa.gov/datacollection/UARML3AL_005.html. Digital Science Data.
creator Waters, Joe W., et al.
data-presentation-form Digital Science Data
graphic-preview-file https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/UARML3AL_005.png
harvest_object_id 04272261-01db-4c0b-8276-b36294b981ac
harvest_source_id 61638e72-b36c-4866-9d28-551a3062f158
harvest_source_title DNG Legacy Data
identifier C1273348589-GES_DISC
issued 1998-10-14
landingPage https://cmr.earthdata.nasa.gov:443/search/concepts/C1273348589-GES_DISC.html
language {en-US}
metadata_type geospatial
modified 1998-10-14
programCode {026:001}
publisher NASA/GSFC/SED/ESD/GCDC/GESDISC
release-place Greenbelt, MD, USA
resource-type Dataset
series-name UARML3AL
source_datajson_identifier true
source_hash 51cf887d98686f843baa9e8ff2ba298636491718dda273106d2bd55b39574507
source_schema_version 1.1
spatial -180.0 -80.0 180.0 80.0
temporal 1991-09-18T00:00:00Z/1999-07-27T23:59:59.999Z
theme {UARS,geospatial}