1 / 20

The Design of a New Satellite-Based Mission: An Overview of CLARREO

The Design of a New Satellite-Based Mission: An Overview of CLARREO. Sunday Group Meeting Presentation Daniel Feldman June 29, 2008. Outline. NRC Decadal Survey Recommendations Motivation for CLARREO CLARREO Design Science & Engineering in Support of CLARREO Future Work.

amy
Download Presentation

The Design of a New Satellite-Based Mission: An Overview of CLARREO

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Design of a New Satellite-Based Mission: An Overview of CLARREO Sunday Group Meeting Presentation Daniel Feldman June 29, 2008

  2. Outline • NRC Decadal Survey Recommendations • Motivation for CLARREO • CLARREO Design • Science & Engineering in Support of CLARREO • Future Work

  3. NRC Decadal Survey • Title: Earth Science and Applications from Space: National Imperatives for the Next Decade & Beyond • 20-member Space Studies Board • 17 recommended missions • ASCENDS: active CO2 sensing • ACE: aerosol-cloud-ecosystems • CLARREO: absolutely calibrated radiances • DESDynl: InSAR surface characterization • XOVWM: ocean wind measurements • GEO-CAPE: geostationary air pollution monitoring • GACM: O3 & air pollutant measuring for chemical weather • GRACE-II: gravitational field variability • HYSPIRI: hyperspectral infrared imager • ICESAT-II: ice sheet thickness • LIST: Lidar surface topography • GSPRO: GPS radio occultation • PATH: precipitation & humidity • SCLP: snow melt & accumulation • SMAP: soil moisture characterization • SWOT: freshwater storage and ocean topography • 3D-Winds:3-dimensional tropospheric winds

  4. CLARREO Motivation • Predicting earth’s climate response to CO2 increases is non-trivial • IPCC FAR models produce range of results • Models & data disagree • Recent data are of high quality & can reveal model deficiencies. From IPCC FAR

  5. Atmospheric Energy Balance From Liou, 2002

  6. CLARREO Motivation • 20+ year measurement campaign for broadband TOA energy balance: ERBE + CERES

  7. CLARREO Motivation • Measurements at different wavelengths provide an extra dimension of analysis. From Anderson, 2007

  8. CLARREO Motivation • Changes in different atmospheric constituents can be described by IR spectra. • Changes in spectra over long time-periods track the earth’s response to CO2 forcing.

  9. CLARREO Motivation • Feedback processes are essential for robust climate model predictions. From Anderson, 2007

  10. CLARREO motivation From Wielicki, 2007 • CLARREO: Climate Absolute Radiance & Reflectivity Observatory (Anderson, et al 2004) • Spectrally-resolved IR measurements from space describe the forcing & response of the climate system • Establishing long-term trend ≠ precise daily measurements • Satellite instruments detectors drift. • Accuracy tied to NIST standards can help to establish trends. • CLARREO slated to contain spectrally-resolved SW & LW measurements w/100 km footprint

  11. CLARREO Motivation • Trend analysis requires a long-term, accurate dataset. From Anderson, 2007

  12. CLARREO Design Questions • Mission design balances cost considerations with science objectives. • Questions of instrument quantity, type, spectral coverage, resolution, orbit, and footprint size must be addressed. • Some designs are expensive and/or infeasible from an engineering perspective. • Orbital simulations can address the utility of a proposed instrument.

  13. CLARREO Design • FTS instrument • Advantages: Good spectral response characterization, imaging capability, small & simple instrument layout • Disadvantages: Stray light, polarization sensitivity, difficult noise characterization • Gallium phase-transition black-body • Quantum cascade laser for black-body emissivity • Rotation of scene mirror introduces polarization that modulates instrument gain

  14. CLARREO Orbital Simulations From Kirk-Davidoff, 2007

  15. CLARREO Orbital Simulations

  16. Remaining Science Questions • Considerable scientific controversy regarding footprint. • Validation & Intercomparison with clouds present • AIRS & MODIS comparisons indicate CLARREO validation requires <15 km footprint

  17. FIRST: Far Infrared Spectroscopy of the Troposphere AIRS AIRS • FIRST is a test-bed for CLARREO • NASA IIP FTS w/ 0.6 cm-1 unapodized resolution, ±0.8 cm scan length • 5-200 μm (2000 – 50 cm-1) spectral range • NeDT goal ~0.2 K (10-60 μm), ~0.5 K (60-100 μm) • 10 km IFOV, 10 multiplexed detectors • Balloon-borne & ground-based observations FIRST

  18. Test Flight on September 18, 2006 AQUA MODIS L1B RGB Image FIRST Balloon AIRS Footprints CloudSat/CALIPSO Footprint Track • Test flight

  19. FIRST and AIRS Cloud Signatures • Instrument collocation • FIRST balloon-borne spectra • AIRS • MODIS • FIRST residuals are consistent with clouds ~ 5 km, CER ~ 6 μm Cloud Detected ! • Test flight

  20. Conclusions • NRC Decadal Survey recommended the implementation of several low-risk high-yield satellite missions. • CLARREO represents an effort to establish long-term trends for climate indicators from a space-based platform • Some design questions have been settled, others are being researched • Engineering CLARREO requirements will be difficult, though flight-models such as FIRST provide a heuristic approach to addressing serious issues.

More Related