# Presentation: 524091

## Aura 

**Microwave Limb Sounder**
- David T. Cuddy
- Jet Propulsion Laboratory
- California Institute of Technology

- October 27, 2008
- Data System Working Group
- Aura Science Meeting
- Columbia, MD

- National Aeronautics and Space Administration
**Jet Propulsion Laboratory**
**California Institute of Technology**

## Agenda

- Project Overview
- Aura Data System
- SIPS Hardware
- Software Data Flow
- Science Products
- V2.2 Releases
- GMAO Data
- V3 Development
- Quad-core
- Summary

- 27 October 2008

- David T. Cuddy

## Project Overview

- David T. Cuddy

_***Salient Features***_
- One of 4 instruments on the EOS Aura spacecraft
- Launch date: July 15, 2004
- Operational life: 5 years
- Dr. Nathaniel Livesey (JPL) Principal Investigator
- Thermal emission from 0 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**

## Aura Data System

- 27 October 2008

- David T. Cuddy

## Hardware Diagram

- 27 October 2008

- David T. Cuddy

## Software Data Flow

- 27 October 2008

- David T. Cuddy

**ML0SCI1, 2**

**AURGBAD1**

**AURATTRH**

**AUREPHMH**

**MLS Level 1 PGE**

- _Level 1 Products_** **
- ML1RADD, ML1RADG, ML1RADT, ML1OA

**MLS Level 2 PGE**

**GMAO data**

- _Level 2 Geophysical data_
- ML2BRO, ML2CLO, ML2CO, ML2GPH, ML2H2O, ML2HCL, ML2HCN, ML2HNO3, ML2HO2, ML2HOCL, ML2IWC, ML2N2O, ML2O3, ML2OH, ML2RHI, ML2SO2, ML2T, ML2CH3CN

**Level 0**

**Level 1**

**Level 2**

- _Level 2 Auxiliary data_
- ML2DGM, ML2DGG

**LeapSec, UTCPole**

**ML0ENG1,2,3,4,5,6**

**ML0SCI1, 2 _NRT**

**AURGBAD1_NRT**

**AURATTR_NRT**

**AUREPHM_NRT**

**MLS NRT PGE**

- _NRT Products_** **
**ML2T_NRT, ML2O3_NRT**

**Level 0**

**NRT**

**LeapSec, UTCPole**

**ML0ENG1,2,3,4,5,6 _NRT**

## Science Products

- Level 1 – Calibrated radiances
- Count – 4 granules/day
- Size – @ 3.4 GB/day
- Level 2 – Geophysical parameters as “swaths”
- BrO, ClO, CO, GPH, H2O, HCl, HCN, HNO3, HO2, HOCl, IWC, N2O, O3, OH, RHI, SO2, T, CH3CN
- Count – 18 granules/day
- Size – 1 to 2 MB each
- Level 2 – Miscellaneous parameters including clouds
- Count – 3 granules/day
- Size – 725 MB/day
- Near Real Time Products – Temperature and Ozone
- Count – up to 96 x 2 granules/day
- Size – <200 KB/granule
- All output products are in HDF5 or HDF-EOS5

- 27 October 2008

- David T. Cuddy

## V2.2 Releases

- V2.2 is the “validated” version of MLS Level 1 and 2 software
- NRT is based on this release
- V2.20 initial release came in late 2006
- Took about 10,000 CPU-hours/data-day on a 3.06 GHz processor
- V2.21 – De-convolve DACS radiances in Level 1
- Began processing in March 2007
- V2.22 increased performance without change of quality
- Realized nearly 100% gain in performance dropping to about 5,000 CPU-hours/data-day on a 3.06 GHz processor
- Gains were realized with code changes to optimized performance and change of compiler to Intel
- Began in December 2007
- V2.23 addresses problems due to Aura FMU anomalies
- This version used for data dates since Dec 4, 2007

- 27 October 2008

- David T. Cuddy

## V2.2 Calendar

- 27 October 2008

- David T. Cuddy

## GMAO Data

- MLS Level 2 products are tied to GMAO output
- GEOS5 5.01:  2004 August 8 (d221) – 2007 November 30 (d334)
- GEOS5 5.10:  2007 December 1 (d335) – 2008 September 14 (d258)*
- GEOS5 5.20:  2008 September 15 (d259) – forward

- 27 October 2008

- David T. Cuddy

## NRT

- MLS has a NRT processor to produce two products every 15 minutes
- Temperature and Ozone
- MLS uses a fast 1D version of the forward model
- Working on a second derivative version to give more accuracy
- Typically, NRT Level 0 data is available within 2 hours and Level 2 data is available within 3 hours
- Data is now publically available via GES-DISC
- NRT Data Quality Description Document is released
- Thanks to GES-DISC for their effort in producing this data in a timely manner

- 27 October 2008

- David T. Cuddy

## V3 Development

- V3 development is on-going and expect to have in production in late spring/early summer of 2009
- Expected features include:
- Forward Model improvements
- Investigate instrument related artifacts such as antenna transmission, filter shifts, and gain compression
- Investigate line shape absorption model
- Study cloud radiation scattering effects
- Product improvements
- Extend measurements vertically
- Increase vertical grid for O3
- Address biases
- Improve products in clouds
- New products: CH3Cl, CH3OH, CH3COCH3, Ice Water Path

- 27 October 2008

- David T. Cuddy

## Quad-Core Performance

- MLS has explored the use of Intel quad-core
- MLS ran our current Level 2 with no re-compilation
- It ran nearly twice as fast on each processor
- Each quad-core has 4 times as many processors as our current architecture
- We think we may be able to realize re-processing 5 years of MLS data in about 7 months with 154 nodes
- Each node has two processors and 16 GB of memory
- With 16 GB memory per board (memory is expensive), we have seen significant increase in throughput
- It may **not** be backward compatible with our current architecture

- 27 October 2008

- David T. Cuddy

## Summary

- EOS MLS is healthy
- MLS is producing validated geophysical products
- MLS is producing Temperature and O3 for Near Real Time
- MLS tries to stay in sync with GMAO output
- MLS is working toward V3
- MLS hopes to leverage performance improvements from Intel

- 27 October 2008

- David T. Cuddy