UARS Microwave Limb Sounder (MLS) Level 3AL V001 (UARML3AL) at GES DISCEntry ID: GES_DISC_UARML3AL_V001
Abstract: 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 H2O which is version 6, and SO2 which is 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. The following subtypes are available:
1) CH3CN - methyl cyanide [vmr]
2) CLO - chlorine monoxide [vmr]
3) H2O - water vapor [vmr]
4) HNO3 - nitric acid [vmr]
5) O3_183 - ozone at 183 GHz [vmr]
6) O3_205 - ozone at 205 GHz [vmr]
7) SO2 - sulfur dioxide [vmr]
8) GPH - geopotential height [m]
9) TEMP - atmospheric temperature [Kelvin]
*vmr = volume mixing ratio
MLS 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 Set Citation
Dataset Originator/Creator: Waters, Joe W., et al.
Dataset Title: UARS Microwave Limb Sounder (MLS) Level 3AL
Dataset Series Name: UARML3AL
Dataset Release Date: 1999
Dataset Release Place: Greenbelt, MD, USA
Dataset Publisher: Goddard Earth Science Data and Information Services Center (GES DISC)
Data Presentation Form: Digital Science DataOnline Resource: http://disc.gsfc.nasa.gov/datacollection/UARML3AL_V001.html
Start Date: 1991-09-18Stop Date: 1999-07-27
Latitude Resolution: 4 degrees
Longitude Resolution: 10 - 30 km wide footprint at limb tangent point
Horizontal Resolution Range: 250 km - < 500 km or approximately 2.5 degrees - < 5.0 degrees
Vertical Resolution: 2.5 km
Temporal Resolution: Twice daily; ascending and descending nodes; 36-day yaw cycle
Temporal Resolution Range: Daily - < Weekly
ATMOSPHERE > ATMOSPHERIC CHEMISTRY > CARBON AND HYDROCARBON COMPOUNDS > METHYL CYANIDE
ATMOSPHERE > ATMOSPHERIC CHEMISTRY > HALOCARBONS AND HALOGENS > CHLORINE MONOXIDE
ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR
ATMOSPHERE > ATMOSPHERIC CHEMISTRY > NITROGEN COMPOUNDS > NITRIC ACID
ATMOSPHERE > ATMOSPHERIC CHEMISTRY > OXYGEN COMPOUNDS > OZONE
ATMOSPHERE > ATMOSPHERIC CHEMISTRY > SULFUR COMPOUNDS > SULFUR DIOXIDE
ATMOSPHERE > ALTITUDE > GEOPOTENTIAL HEIGHT
ATMOSPHERE > ATMOSPHERIC TEMPERATURE > AIR TEMPERATURE
ISO Topic Category
Data Set Progress
Distribution Media: FTP/HTTP
Distribution Size: 101.4 MB
Distribution Format: Binary
Role: DIF AUTHOR
Email: James.Johnson at nasa.gov
NASA Goddard Space Flight Center Code 610.2
Province or State: MD
Postal Code: 20771
Email: joe at mls.jpl.nasa.gov
Mail Stop 183-701, Jet Propulsion Laboratory, 4800 Oak Grove Drive
Province or State: CA
Postal Code: 91109-8099
Role: TECHNICAL CONTACT
Email: gsfc-help-disc at lists.nasa.gov
Goddard Earth Sciences Data and Information Services Center Code 610.2 NASA Goddard Space Flight Center
Province or State: MD
Postal Code: 20771
Reber, C. A., C. E. Trevathan, R. J. McNeal, and M. R. Luther, The Upper Atmosphere Research Satellite (UARS) Mission, J. Geophys. Res. 98, D6, 10643-10647, 1993.
Barath, F. T., et al, The Upper Atmosphere Research Satellite Microwave Limb Sounder Instrument, J. Geophys. Res. 98, D6, 10751-10762, 1993.
Waters, J. W., et al, Stratospheric ClO and ozone from the Microwave Limb Sounder on the Upper Atmosphere Research Satellite, Nature, 362, 597-602, 1993.
Read, W. G., L. Froidevaux and J. W. Waters, Microwave Limb Sounder Measurements of Stratospheric SO2 from the Mt Pinatubo Volcano, Geophys. Res. Lett., 20, 1299-1302, 1993.
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Creation and Review Dates
DIF Creation Date: 2007-02-26
Last DIF Revision Date: 2014-11-16
Future DIF Review Date: 2015-08-01