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HIRDLS

HIRDLS. High Resolution Dynamic Limb Sounder. Basics. Set to fly on the Aura mission of NASA’s Earth Observation System Joint US-UK (NASA-NERC) development Scheduled for launch in December 2002, then June 2003, now June 17, 2004

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HIRDLS

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  1. HIRDLS High Resolution Dynamic Limb Sounder

  2. Basics • Set to fly on the Aura mission of NASA’s Earth Observation System • Joint US-UK (NASA-NERC) development • Scheduled for launch in December 2002, then June 2003, now June 17, 2004 • Will sound upper troposphere, stratosphere, and mesosphere (8km-80km) to determine : • Temperature/Pressure • Concentrations of : O3, H2O, CH4, N2O, NO2, HNO3, N2O5, CFC11, CFC12, ClONO2, and aerosols • Locations of polar stratospheric clouds and cloud tops

  3. Operational Tidbits • Operates in sun synchronous orbit at 705km • Completes orbit in 105 minutes • Takes ~10,000 profiles per day with one complete profile in 12 hours • Spatial Resolution • Horizontal : 5° x 5° (500km x 500km) • Vertical : 1-1.25km • Measures infrared emission in 21 channels ranging from 570-1600 cm-1 • 4 sensors for CO2, 4 for O3, and 1 for each remaining constituent sampled • Has an onboard gyroscope for accurate reporting of where the instrument was pointing for a given measurement

  4. Scan Cycle

  5. HIRDLS Limb Viewing Geometry (Satellite moving clockwise)

  6. Data processing • CO2 mixing ratio is well known • Using this information and CO2 radiance measurements to determine temperature/pressure information • Using temperature/pressure data with blackbody formula to calculate mixing ratios of the constituent of interest

  7. Limb Radiance Spectra

  8. Weighting Functions Ch. 2-5

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