UARS Microwave Limb Sounder (MLS) Level 3AT

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Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: UARS Microwave Limb Sounder (MLS) Level 3AT
Edition: 001
Geospatial_Data_Presentation_Form:
Series_Information:
Series_Name:
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Publication_Information:
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Online_Linkage: http://mirador.gsfc.nasa.gov/cgi-bin/mirador/presentNavigation.pl?tree=project&project=UARS&dataGroup=MLS&dataset=ML3AT
Description:
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.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: 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.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19910918
Ending_Date: 19990728
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -180.0
East_Bounding_Coordinate: 180.0
North_Bounding_Coordinate: 80.0
South_Bounding_Coordinate: -80.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: PROJECT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > TRACE GASES/TRACE SPECIES
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > AIR TEMPERATURE
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > HUMIDITY
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > HALOCARBONS AND HALOGENS > CHLORINE MONOXIDE
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > OXYGEN COMPOUNDS > OZONE
Theme_Keyword: UARS > UPPER ATMOSPHERE RESEARCH SATELLITE
Theme_Keyword: MLS > MICROWAVE LIMB SOUNDER
Theme_Keyword: EOSDIS > EARTH OBSERVING SYSTEM DATA INFORMATION SYSTEM
Theme_Keyword: ESIP > EARTH SCIENCE INFORMATION PARTNERS PROGRAM
Theme_Keyword: UARS > UPPER ATMOSPHERE RESEARCH SATELLITE
Theme_Keyword: CWIC > CEOS WGISS INTEGRATED CATALOG
Theme_Keyword: Atmospheric Chemistry
Theme_Keyword: Chlorine Monoxide
Theme_Keyword: Clo
Theme_Keyword: Daily Data
Theme_Keyword: Eosdis
Theme_Keyword: H2o
Theme_Keyword: Idn_node Gsfc/gsfc_daac
Theme_Keyword: Middle Atmosphere
Theme_Keyword: Mls Level 3a
Theme_Keyword: O3
Theme_Keyword: Ozone Chemistry
Theme_Keyword: Upper Atmosphere
Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: GEOGRAPHIC REGION > GLOBAL
Place_Keyword: VERTICAL LOCATION > MESOSPHERE
Place_Keyword: VERTICAL LOCATION > STRATOSPHERE
Temporal:
Temporal_Keyword_Thesaurus: GCMD
Temporal_Keyword: Daily
Temporal_Keyword: Daily - < Weekly
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: JOE W. WATERS
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Mail Stop 183-701, Jet Propulsion Laboratory, 4800 Oak Grove Drive
City: Pasadena
State_or_Province: CA
Postal_Code: 91109-8099
Country: USA
Contact_Electronic_Mail_Address: joe@mls.jpl.nasa.gov
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 4 Degrees
Longitude_Resolution: 4 Degrees
Geographic_Coordinate_Units: Decimal degrees
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: Not Available
Altitude_Resolution: 2.5 km
Altitude_Distance_Units: Not Available
Altitude_Encoding_Method: Implicit coordinate
Depth_System_Definition:
Depth_Datum_Name: Not Available
Depth_Resolution: 2.5 km
Depth_Distance_Units: Not Available
Depth_Encoding_Method: Implicit coordinate
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NASA/GSFC/SED/ESD/GCDC/GESDISC > 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
Contact_Person: GES DISC HELP DESK SUPPORT GROUP
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Goddard Earth Sciences Data and Information Services Center
Address: Code 610.2
Address: NASA Goddard Space Flight Center
City: Greenbelt
State_or_Province: MD
Postal_Code: 20771
Country: USA
Contact_Voice_Telephone: 301-614-5224
Contact_Facsimile_Telephone: 301-614-5268
Contact_Electronic_Mail_Address: gsfc-help-disc@lists.nasa.gov
Resource_Description: MLS 3AL
Resource_Description: MLS 3AT
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://disc.gsfc.nasa.gov/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://mirador.gsfc.nasa.gov/cgi-bin/mirador/colle...
Access_Instructions:
Get data via GES DISC Mirador
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
ftp://acdisc.gsfc.nasa.gov/data/s4pa/UARS_MLS_Leve...
Access_Instructions:
README
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20070226
Metadata_Review_Date: 20090821
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: JAMES EDWARD JOHNSON
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: NASA Goddard Space Flight Center
Address: Code 610.2
City: Greenbelt
State_or_Province: MD
Postal_Code: 20771
Country: USA
Contact_Voice_Telephone: 301-614-5121
Contact_Electronic_Mail_Address: James.Johnson@nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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