Level 3 Product Development AIRS Science Team Meeting Greenbelt, MD March 30 April 1, 2004

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Level 3 Product DevelopmentAIRS Science Team
MeetingGreenbelt, MDMarch 30 April 1, 2004

• Stephanie Granger, Stephen Leroy

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AIRS Level 3 Development

• Ease of Use
• Experience (UARS, MISR) has shown that the use of
  Level 3 data facilitates and promotes wide use of
  data
• Lower volume
• Level 2 standard product
• - 4.7 MB 240 .1.13 GB
• - Download time 1.544 Mb 1.623 hours
• Level 3 prototype
• - 38 MB
• - Download time 1.544 Mb 3.3 minutes
• Less complex
• Users
• Modeling community.
• Research community
• NWP
• Engage the science community and the public
• Promotes global analysis of geophysical
  parameters
• Produce global images that are easily
  comprehensible

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AIRS Level 3 Product Development

• Background
• Investigation
• UARS, TES, MISR, Modelers
• Temporal/spatial resolution
• Gridding methods
• Conclusion
• No holy grail
• Resolution
• Gridding
• Most common
• Daily, Pentad, Calendar month
• Means/standard deviation/counts

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AIRS Level 3 Product DevelopmentConventional
Product

• Customers
• Atmospheric dynamics
• Climate variability and change
• Hydrological cycle
• Requirements
• Encompass many level 2 variables
• Global/Gridded
• Ease of use in terms of data format (HDF,
  NetCDF)
• Reasonable size (ease of use for the small user)

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Level 3 Algorithm Development

• Plan
• 2 types of products
• Conventional
• Binned 1x1 degree averages ( std dev counts)
• Separated by ascending/descending node
• Daily
• 8-day
• based on 1/2 Aqua orbit cycle
• Monthly (may be 2x2 degree)
• calendar
• Near-term (v4.0)
• Enhanced - Braverman
• Statistical summaries Future (v5.0)

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AIRS Level 3 Product DevelopmentProduct
Characteristics
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AIRS Level 3 Product DevelopmentAccomplishments

• Goal FY 04
• Level 3 Products on-line
• Accomplishments to support the goal
• Development of AIRS Level 3 Science Requirements
  completed.
• ADFM 660 (Leroy, Granger)
• Initial selection of Level 3 final products
  completed.
• Subject to update based on feedback from science
  community.
• Selection of Level 3 beta products completed.
• Core products
• Development of prototype Level 3 code and product
  completed.
• Development of CD containing documentation and
  prototype L3 products complete.
• Software development cycle under way (v4.0).

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AIRS Level 3 Product Development
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AIRS Level 3 Prototype
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AIRS Level 3 Product DevelopmentPrototype Product

• CD Format and Contents Overview
• html format to aid in navigation
• Data
• January, 2003 v3.5
• 31 daily files
• 3 8-day files (half of the Aqua orbit cycle)
• 1 monthly file
• Means and Counts
• Averaged and binned into 1x1 cells.
• Data File Description
• HDF-EOS Grid format
• Ascending and descending orbits in same file
• Compressed using gzip utility
• IDL reader
• Returns structure of Level 3 parameters

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Level 3 Product DevelopmentQC
Green retQAflag 0 Blue retQAflag bits 0 - 7
0
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AIRS Level 3 Product DevelopmentCoverage
Daily, Ascending
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AIRS Level 3 Product DevelopmentCoverage
Daily, Descending
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AIRS Level 3 Product DevelopmentCoverage
8-Day, Ascending
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AIRS Level 3 Product DevelopmentCoverage
8-Day, Descending
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AIRS Level 3 Product DevelopmentCoverage
Monthly, Ascending
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AIRS Level 3 Product DevelopmentCoverage
Monthly, Descending
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AIRS Level 3 Product DevelopmentSummary

• Level 3 conventional product development on track
• AIRS Level 3 PGE development
• Aggressive schedule
• To Integration/Test - May 04
• Delivery to DAAC v4.0
• Continue to receive and encourage feedback from
  L3 beta
• L3 beta uploaded to GSFC near-term
• Level 3 Enhanced product
• v5.0