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The Earth Observing System (EOS) Microwave Limb Souder (MLS) is an atmospheric remote sensing experiment led by the Jet Propulsion Laboratory of the California Institute of Technology. The objectives of the EOS MLS are to learn more about the stratospheric chemistry and causes of ozone changes, processes affecting climate variablility, and pollution in the upper troposphere. The EOS MLS is one of four instruments on the National Aeronautics and Space Administration (NASA) EOS Aura spacecraft mission launched on July 15, 2004. MLS has been producing, archiving and distributing Level 2 products to users and investigators since February 2005. They have been publically available since August 2005. The MLS Level 3 software is currently under development and will be released before August 2006. MLS will present information about its Level 3. This will describe the Daily and Monthly products and metadata files to be produced, their data formats and structures, namely the Swath, Grid and Zonal Mean types contained in HDF-EOS, the emerging Aura-wide Guidelines for Level 3 products, and finally how use is made of the software SDP Toolkit version 5.2.13 and HDF-EOS 5 library version 5.1.9.
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National Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology
MLS Level 3 Products
Paul Wagner1, Yibo Jiang1, Christina Vuu2, David Cuddy1
1Jet Propulsion LaboratoryCalifornia Institute of Technology
2Raytheon Information Solutions – Pasadena Operations
December 2, 2005
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 2
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Agenda
• Project Overview
• Aura Data Flow
• MLS Data Flow Diagram
• Level 3 Products– Data Format
– Swath Data Structure
– Grid Data Structure
– Zonal Means Data Structure
– Metadata File
• Tools and Components
• Conclusion
• Useful Websites
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 3
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Project Overview
Salient Features • One of 4 instruments on the EOS Aura spacecraft• Launch date: July 15, 2004 • Operational life: 5 years• Dr. Joe Waters (JPL) Principal Investigator• Thermal emission from 1 to 100 km altitude in five millimeter
and submillimeter wavelength bands• All measurements are performed simultaneously and
continuously, both day and night, and can be made even in the presence of dense cirrus clouds and stratospheric aerosols
Science• Improve understanding and assessment of:
– Stratospheric ozone depletion and chemistry– Upper tropospheric ozone distribution and chemistry– Climate change and variability
• Global distribution of O3, ClO, H2O, SO2, CO, N2O, HNO3, HCl, HOCl, BrO, OH, HO2, HCN, temperature, geopotential height, and cirrus ice
EOS MLS - Microwave Limb Sounder
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 4
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Aura Data Flow
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 5
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Data Flow Diagram
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 6
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Level 3 Data Format
• MLS Level 3 Daily Products:– Using HDF-EOS5 Swath and Grid formats
• MLS Swaths comply with the Aura Guidelines, v1.7
– 13 daily maps and their metadata files for the following species: ClO, CO, GPH, H2O, HCl, HCN, HNO3, N2O, O3, OH, RHI, IWC, and Temperature
• MLS Level 3 Monthly Products:– Using HDF-EOS5 Swath, Grid and/or Zonal Means formats
– ‘Standard’ and ‘Diagnostic’ data files for each day of the processed month in Zonal Means format
– Two monthly data files named ‘Standard’ and ‘Diagnostic’ in Zonal Means format
– Two monthly data files named ‘Standard’ and ‘Diagnostic’ in Grid and Swath formats
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 7
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Level 3 Swath Data Structure
File Level Attributes:
OrbitNumber – 16 (for daily) or 2 (for monthly) orbit numbersOrbitPeriod – 16 (for daily) or 2 (for monthly) orbit periods InstrumentName – ‘MLS Aura’ProcessLevel – ‘L3-Daily’ or ‘L3-Monthly’GranuleMonth – ‘3’ GranuleDay – ‘11’GranuleYear – ‘2005’TAI93At0zOfGranule – ‘3.846e+08’PGEVersion – ‘v2-0’StartUTC -- ‘2005-070T00:00:00.00000Z’EndUTC -- ‘2005-070T23:59:99.99999Z’Period --‘Daily’ or ‘Monthly’
Swath Name 1: Species namesSwath Level Attributes:Pressure – Pressure valuesVerticalCoordinate – ‘Pressure’
Dimensions:nLevels -- Number of Pressure levelsnTimes – Number of times (profiles) in data set
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 8
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Level 3 Swath Data Structure (Cont.)
Swath Name 1: Species names (cont.)
Data Fields:Value PrecisionStatusQuality
Data Field Attributes:MissingValueTitleUnitsUniqueFieldDefinition
Swath Name2: Species names
Additional swaths may occur in a file
Geolocation Fields:Time LatitudeLongitudePressureSolarZenithAngleLocalSolarTimeLineOfSightAngleOrbitGeodeticAngle
Geolocation Field Attributes:MissingValueTitleUnitsUniqueFieldDefinition
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 9
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Level 3 Grid Data Structure
File Level Attributes:
OrbitNumber – 16 (for daily) or 2 (for monthly) orbit numbersOrbitPeriod – 16 (for daily) or 2 (for monthly) orbit periodsInstrumentName – ‘MLS Aura’ProcessLevel – ‘L3-Daily’ or ‘L3-Monthly’GranuleMonth – ‘3’ GranuleDay – ‘11’GranuleYear – ‘2005’TAI93At0zOfGranule – ‘3.846e+08’PGEVersion – ‘v2-0’StartUTC -- ‘2005-070T00:00:00.00000Z’EndUTC -- ‘2005-070T23:59:99.99999Z’Period --‘Daily’ or ‘Monthly’
Grid Name 1: Species names
Grid Level Attributes:Projection – ‘Simple Cylindrical’GridOrigin – ‘Center’GridSpacing – ‘(4,2)’GridSpacingUnit – ‘Degree’GridSpan – ‘(0,360,-82,+82)’GridSpanUnit – ‘Degree’
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 10
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology
Grid Name 1: Species names (cont.)
Data Fields:ValuePrecisionLatitude LongitudePressure Time
Data Field Attributes:MissingValueTitleUnitsUniqueFieldDefinition
Grid Name2: Species names
Additional grids may occur in a file
Level 3 Grid Data Structure (Cont.)
Dimensions:XDim – Which is LongitudeYDim – Which is LatitudenLevels -- Number of Pressure levels
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 11
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Level 3 Zonal Means Data Structure
File Level Attributes:
OrbitNumber – 16 (for daily) or 2 (for monthly) orbit numbersOrbitPeriod – 16 (for daily) or 2 (for monthly) orbit periodsInstrumentName – ‘MLS Aura’ProcessLevel – ‘L3-Daily’ or ‘L3-Monthly’GranuleMonth – ‘3’ GranuleDay – ‘11’GranuleYear – ‘2005’TAI93At0zOfGranule – ‘3.846e+08’PGEVersion – ‘v2-0’StartUTC -- ‘2005-070T00:00:00.00000Z’EndUTC -- ‘2005-070T23:59:99.99999Z’Period --‘Daily’ or ‘Monthly’
Zonal Name 1: Species namesZonal Level Attributes:Pressure – Pressure valuesVerticalCoordinate – ‘Pressure’ZonalSpacing – ‘2’ZonalSpacingUnit – ‘Degree’
Dimensions:nLatitude – Number of LatitudesnLevels -- Number of Pressure levels
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 12
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Level 3 Zonal Means Data Structure (Cont.)
Zonal Name 1: Species names (cont.)
Data Fields:ValuePrecisionLatitude Pressure Time
Data Field Attributes:MissingValueTitleUnitsUniqueFieldDefinition
Zonal Name2: Species names
Additional zonals may occur in a file
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 13
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Level 3 Metadata
• MLS Level 3 Metadata file will be created for each data file.
• MLS Level 3 Metadata file contains the following information:– Local Granule ID
– Production Date and Time
– Local Version ID
– PGE Version
– Reprocessing Planned
– Input Granule
– Short Name
– Beginning and Ending Date and Time
– Group of Measured Parameter contains QA Flags and Statistic
– Group of Orbit Calculated Spatial Domain contains Start and Stop Orbit Numbers, Equator Crossing Date, Time and Longitude
– Group of Horizontal and Vertical Spatial Domain
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 14
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Tools and Components
• MLS Level 3 currently built with the following:– Toolkit version 5.2.13
– HDF5 library version 1.6.3
– HDF-EOS5 library version 5.1.9
• MLS Level 3:– Fortran 95
– Lahey compiler v6.1
– Linux with Red Hat Enterprise v 3.4.4-2
• IDL – MLS uses version 6.2
– Version 6.1 or later required to read Aura Guidelines-compliant data
– A Level 2 reader available now; a Level 3 reader is promised
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 15
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Conclusion
• MLS Level 1 and Level 2 products continue to be produced, and archived, having become available to users since February 2005.
• MLS Level 3 is currently under development; its release is planned for August 2006.
• The draft version 2.0 of HDF-EOS Aura Guidelines including the MLS Level 3 Standard was issued on October 30, 2005.
December 2, 2005 P. Wagner, Y. Jiang, C. Vuu, D. Cuddy 16
Aura Microwave Limb SounderNational Aeronautics and Space AdministrationJet Propulsion LaboratoryCalifornia Institute of Technology Useful Websites
• Microwave Limb Sounder home page– http://mls.jpl.nasa.gov/
• EOS Data Gateway (EDG) – http://delenn.gsfc.nasa.gov/~imswww/pub/imswelcome/
• GSFC DAAC Web-based Hierarchical Ordering Mechanism (WHOM)
– http://disc.gsfc.nasa.gov/data/dataset/MLS/
• GSFC DAAC Datapool– http://disc.gsfc.nasa.gov/data/datapool/MLS/
• GES-DISC DAAC Interactive Online Visualization and Analysis Infrastructure (Giovanni)
– http://reason.gsfc.nasa.gov/Giovanni_mls3d/
