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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 …

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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  • 1. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology MLS Level 3 Products Paul Wagner1, Yibo Jiang1, Christina Vuu2, David Cuddy1 Jet Propulsion Laboratory California Institute of Technology 2 Raytheon Information Solutions – Pasadena Operations 1 December 2, 2005
  • 2. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology • • • • Aura Microwave Limb Sounder 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.
  • 3. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder Project Overview EOS MLS - Microwave Limb Sounder 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 December 2, 2005 P. Wagner, Y. Jiang, C.
  • 4. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology December 2, 2005 Aura Microwave Limb Sounder Aura Data Flow P. Wagner, Y. Jiang, C.
  • 5. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology December 2, 2005 Aura Microwave Limb Sounder Data Flow Diagram P. Wagner, Y. Jiang, C.
  • 6. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder 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.
  • 7. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder Level 3 Swath Data Structure File Level Attributes: OrbitNumber – 16 (for daily) or 2 (for monthly) orbit numbers OrbitPeriod – 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 names Swath Level Attributes: Pressure – Pressure values VerticalCoordinate – ‘Pressure’ Dimensions: nLevels -- Number of Pressure levels nTimes – Number of times (profiles) in data set December 2, 2005 P. Wagner, Y. Jiang, C.
  • 8. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder Level 3 Swath Data Structure (Cont.) Swath Name 1: Species names (cont.) Data Fields: Value Precision Status Quality Geolocation Fields: Time Latitude Longitude Pressure SolarZenithAngle LocalSolarTime LineOfSightAngle OrbitGeodeticAngle Data Field Attributes: MissingValue Title Units UniqueFieldDefinition Geolocation Field Attributes: MissingValue Title Units UniqueFieldDefinition Swath Name2: Species names Additional swaths may occur in a file December 2, 2005 P. Wagner, Y. Jiang, C.
  • 9. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder Level 3 Grid Data Structure File Level Attributes: OrbitNumber – 16 (for daily) or 2 (for monthly) orbit numbers OrbitPeriod – 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’ 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.
  • 10. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder Level 3 Grid Data Structure (Cont.) Grid Name 1: Species names (cont.) Dimensions: XDim – Which is Longitude YDim – Which is Latitude nLevels -- Number of Pressure levels Data Fields: Value Precision Latitude Longitude Pressure Time Data Field Attributes: MissingValue Title Units UniqueFieldDefinition Grid Name2: Species names Additional grids may occur in a file December 2, 2005 P. Wagner, Y. Jiang, C.
  • 11. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder Level 3 Zonal Means Data Structure File Level Attributes: OrbitNumber – 16 (for daily) or 2 (for monthly) orbit numbers OrbitPeriod – 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’ Zonal Name 1: Species names Zonal Level Attributes: Pressure – Pressure values VerticalCoordinate – ‘Pressure’ ZonalSpacing – ‘2’ ZonalSpacingUnit – ‘Degree’ Dimensions: nLatitude – Number of Latitudes nLevels -- Number of Pressure levels December 2, 2005 P. Wagner, Y. Jiang, C.
  • 12. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder Level 3 Zonal Means Data Structure (Cont.) Zonal Name 1: Species names (cont.) Data Fields: Value Precision Latitude Pressure Time Data Field Attributes: MissingValue Title Units UniqueFieldDefinition Zonal Name2: Species names Additional zonals may occur in a file December 2, 2005 P. Wagner, Y. Jiang, C.
  • 13. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology • • Aura Microwave Limb Sounder 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.
  • 14. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder 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.
  • 15. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder 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.
  • 16. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Aura Microwave Limb Sounder 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/ December 2, 2005 P. Wagner, Y. Jiang, C.