Locations>VERTICAL LOCATION>MESOSPHERE
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UARS Microwave Limb Sounder (MLS) Level 3AT V001 (UARML3AT) at GES DISC Entry ID: GES_DISC_UARML3AT_V001 |
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Summary
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Abstract:
The Microwave Limb Sounder (MLS) on NASA's Upper Atmosphere Research Satellite (UARS) measured the chemical composition of the stratosphere and mesosphere, primarily to investigate ozone chemistry and the relationship between chlorine monoxide and ozone destruction. MLS measured thermal emissions of ozone (O3), water vapor (H2O), and chlorine monoxide (ClO) in the microwave spectral region at frequencies of 63, 183, 205 GHz. The instrument included the main sensor, spectrometer, and power supply. The sensor consisted of a three-mirror antenna system, three radiometers (63, 183, and 205 GHz), the multiplexing optics, and the calibration system. Vertical resolution is about 4 km for chemical species profiles. Horizontal (cross-track) resolution is 10 to 30 km. MLS viewed the Earth limb perpendicular to the spacecraft orbital velocity vector, and scanned from ground to 100 km every UARS minute (65.536 seconds). A switching mirror inside the radiometer box selects either the atmospheric signal from the antenna system, the calibration from an internal source, or a zero-reference space view. The signals from the switching mirror are then spatially separated into various spectral bands by microwave optics. The spectrometer consists of filter banks that separate the signal from each band into 15 channels. The resolution of individual channels varies from 128 MHz on the edge to 2 MHz near the center of the spectral line being measured. This resolution is matched to the characteristics of the atmospheric emission lines over the altitude range covered. The MLS Level 3A data products consist of profiles that have been interpolated both vertically and horizontally from the original profiles to standard surfaces and locations defined by the UARS project for all limb-viewing instruments. The Level 3A format is common to all UARS instruments to allow for intercomparison. The MLS Level 3A data products consist of two product types: 1) 3AT - Time-ordered Level 3A MLS data, 2) 3AL - Latitude-ordered Level 3A MLS data. Associated with each Level 3A product is a parameter file (3TP with 3AT files and 3LP with 3AL files), containing additional information on MLS operations for each profile. Level 3AT/TP data products consist of time-ordered profiles and are spaced at intervals of 1 UARS minute, or approximately 495 km along the tangent track. Level 3AL/LP data products consist of profiles at the intersection of the tangent track spaced at intervals of 4 degrees latitude. The MLS Level 3AT and 3AL data consist of five products per day. Each data product (file) is one MLS species per day. The following species are measured: 1) O3_183 - ozone concentrations (ppmv) at 183 GHz, 2) O3_205 - ozone concentrations (ppmv) at 205 GHz, 3) ClO - chlorine monoxide concentrations (ppmv), 4) H2O - water vapor concentrations (ppmv), and 5) TEMP - atmospheric temperature (degrees K). The horizontal resolution is 495-km along-track for the Level 3AT/TP files, and 4 degrees latitude for Level 3AL/LP files. The UARS standard data array is the common data structure used for all Level 3 data subtypes. For MLS the index into the data array corresponds to standard pressure levels given in millibars, with each level at approximately 2.5 km increments. |
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Link:
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MIRADOR
Description: Get data via GES DISC Mirador Link: VIEW RELATED INFORMATION > USER'S GUIDE Description: README |
Geographic Coverage
| N: 80.0 | S: -80.0 | E: 180.0 | W: -180.0 |
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Data Set Citation
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Dataset Title:
UARS Microwave Limb Sounder (MLS) Level 3AT
Version: 001 Online Resource: http://mirador.gsfc.nasa.gov/cgi-bin/mirador/presentNavigation.pl?t... |
Temporal Coverage
| Start Date: 1991-09-18 |
| Stop Date: 1999-07-28 |
Location Keywords
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GEOGRAPHIC REGION
> GLOBAL
VERTICAL LOCATION > MESOSPHERE VERTICAL LOCATION > STRATOSPHERE |
Data Resolution
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Latitude Resolution:
4 Degrees
Longitude Resolution: 4 Degrees Vertical Resolution: 2.5 km Temporal Resolution: Daily |
Science Keywords
| ATMOSPHERE >ATMOSPHERIC CHEMISTRY >TRACE GASES/TRACE SPECIES [Definition] |
| ATMOSPHERE >ATMOSPHERIC TEMPERATURE >AIR TEMPERATURE [Definition] |
| ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY [Definition] |
| ATMOSPHERE >ATMOSPHERIC WATER VAPOR >WATER VAPOR [Definition] |
| ATMOSPHERE >ATMOSPHERIC CHEMISTRY >HALOCARBONS AND HALOGENS >CHLORINE MONOXIDE [Definition] |
| ATMOSPHERE >ATMOSPHERIC CHEMISTRY >OXYGEN COMPOUNDS >OZONE [Definition] |
ISO Topic Category
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CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
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Platform
| UARS >Upper Atmosphere Research Satellite [Information] |
Instrument
| MLS >Microwave Limb Sounder [Information] |
Project
| EOSDIS >Earth Observing System Data Information System [Information] |
| ESIP >Earth Science Information Partners Program [Information] |
| UARS >Upper Atmosphere Research Satellite [Information] |
| CWIC >CEOS WGISS Integrated Catalog [Information] |
Keywords
| ATMOSPHERIC CHEMISTRY |
| CHLORINE MONOXIDE |
| CLO |
| DAILY DATA |
| EOSDIS |
| H2O |
| IDN_NODE GSFC/GSFC_DAAC |
| MIDDLE ATMOSPHERE |
| MLS LEVEL 3A |
| O3 |
| OZONE CHEMISTRY |
| UPPER ATMOSPHERE |
Originating Center
| GSFC_DAAC |
Data Center
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Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA
[Information]
Data Center URL: http://disc.gsfc.nasa.gov/ Dataset ID: MLS 3AL Dataset ID: MLS 3AT
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Personnel
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JAMES
EDWARD
JOHNSON Role: DIF AUTHOR Phone: 301-614-5121 Email: James.Johnson at nasa.gov Contact Address: NASA Goddard Space Flight Center Code 610.2 City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA |
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JOE
W.
WATERS Role: INVESTIGATOR Email: joe at mls.jpl.nasa.gov Contact Address: Mail Stop 183-701, Jet Propulsion Laboratory, 4800 Oak Grove Drive City: Pasadena Province or State: CA Postal Code: 91109-8099 Country: USA |
Publications/References
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.
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.
Creation and Review Dates
DIF Creation Date:
2007-02-26
Last DIF Revision Date:
2009-08-21
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