# Presentation: 740104

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

**Stephanie Granger, Stephen Leroy**

## 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

## 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*

## AIRS Level 3 Product DevelopmentConventional 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)

## Level 3 Algorithm Development

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

## AIRS Level 3 Product DevelopmentProduct Characteristics

| Product | Spatial Resolution/ Characteristics | Use/Customer |
| --- | --- | --- |
| Daily | 1°x1° 
“complex” data – leaves in gores | NWP community
Interest in what dataset reveals about weather independent of model and other data
 |
| 8-Day
(one-half AQUA orbit cycle | 1°x1° 
“moderate” data – no gores, may be some gaps
 | Climate quasi-oscillations
Madden_Julian oscillation
Annular modes
Quasi-biennial oscillation |
| Monthly
(Calendar) | 2°x2° 
“simple” data – no gores
 | Climate trend analysis
Monthly means over long timescales |

## AIRS Level 3 Product DevelopmentAccomplishments

**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).***

## AIRS Level 3 Product Development

| Product | Levels | Product | Levels |
| --- | --- | --- | --- |
| Temperature Profile | 25 | Surface skin temperature | 1 |
| Temperature Profile MW | 25 | Vis Cloud Fraction (day) | 1 |
| Geopotential Height | 25 | Cloud Height | 2 |
| Water Vapor Profile | 12 | Cloud Fraction | 2 |
| Ozone | 28 | OLR | 1 |
| Precipitable Water | 1 | MW surface emissivity | 4 or 1 |
| Surface pressure | 1 | IR emissivity | 7 or 4 |
| Surface air temperature | 1 |  |  |

## AIRS Level 3 Prototype

| Parameter | Levels | Internal parameter name |
| --- | --- | --- |
| Total ozone | 1 | totO3Std |
| Surface Skin Temperature | 1 | TSurfStd |
| Surface Air Temperature | 1 | TSurfAir |
| Temperature Profile | 28 | TairStd. (28 standard pressure levels. Units: Kelvin) |
| Total water vapor | 1 |  totH2OStd |
| Water vapor profile | 13 | H2OMMRStd (13 standard pressure levels to 100 mb)  |

## AIRS Level 3 Product DevelopmentPrototype 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 1°x1° 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

## Level 3 Product DevelopmentQC

**Green = retQAflag = 0**
**Blue = retQAflag bits 0 - 7 = 0**

## AIRS Level 3 Product DevelopmentCoverage – Daily, Ascending

## AIRS Level 3 Product DevelopmentCoverage – Daily, Descending

## AIRS Level 3 Product DevelopmentCoverage – 8-Day, Ascending

## AIRS Level 3 Product DevelopmentCoverage – 8-Day, Descending

## AIRS Level 3 Product DevelopmentCoverage – Monthly, Ascending

## AIRS Level 3 Product DevelopmentCoverage – Monthly, Descending

## AIRS Level 3 Product DevelopmentSummary

**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***