1 / 26

Earth Observation Science

Earth Observation Science. Recent and potential scientific achievements of the (A)ATSR Series - and some possibilities for synergy with MERIS David Llewellyn-Jones Space Research Centre University of Leicester. AATSR Science – and MERIS. What can AATSR do? Some Scientific Highlights

gisela-chapman
Download Presentation

Earth Observation Science

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. Earth Observation Science Recent and potential scientific achievements of the (A)ATSR Series - and some possibilities for synergy with MERIS David Llewellyn-Jones Space Research Centre University of Leicester

  2. AATSR Science – and MERIS • What can AATSR do? • Some Scientific Highlights • AATSR and MERIS • What can AATSR do for MERIS? • What can MERIS do for AATSR? • The Future prospects • Archive • Data continuity

  3. What does AATSR do? • It is an imager co-registered with MERIS • Spatial Resolution of 1Km • Swath width 500km • Dual angle view: at nadir, like MERIS and at 55º to nadir • Three thermal IR channels, at 3.7.10.5 7 12 µm • Tour reflected infrared channels • High quality on-board calibration systems

  4. Scientific Highlights of the ATSR-1, ATSR-2, AATSR programmes Ocean Science • Tropical Instability Waves • Observation of thermal signature of Rossby Waves • Global change in SST Atmospheric Science • Atmospheric Water Vapour • Aerosols and clouds • ATSR-2 cloud data key to retrieval of GOME Ozone Land Applications • Enhanced atmospheric correction from dual-angle view • Improved calibration of AVHRR and MODIS visible channels

  5. Tropical Instability Waves (2½ Years)(Allen et al 1995) Rossby waves detected also in the SST anomaly field (Hill et al, 2000)

  6. Measurement of Residual Trends in Global SST from AVHRR and ATSR data Lawrence et al

  7. Western Boundary Currents of the Northern Hemisphere Gulf Stream Kuroshio

  8. Thermohaline Ocean Circulation http://oceansjsu.com/105d/exped_circulation/21.html

  9. The Gulf Stream in 2003 (Biweekly Averages, Feb - July)

  10. KuroShio from AATSR on ENVISAT: 2002-2005

  11. Movements of the Kuroshio: 1995-2005data source: ATSR-2 and AATSR

  12. KuroShio Position and Wind-field curl • From ATSR-2 and AATSR • From ECMWF wind-fields

  13. KuroShio meanders – preliminary conclusions • Kuroshio position can be quantitatively monitored using (A)AATSR data • study of 10-year time series suggests some possibility of correlation between wind-stress curl and Kuroshio position • However, other possible mechanisms (including ocean gyres) must be investigated • Cloud contamination a problem – need for a new approach?

  14. Recent applications of AATSAR data • See Simon Good’s poster • Precursor work to investigation of W Boundary Currents • Compares AATSR SSTs with SSTs from other satellites • Demonstrates the value of Medspiration/GHRSST

  15. AATSR and MERIS • Main differences & similarities • Potential synergy: • What can MERIS do for AATSR? • What can AATSR do for MERIS?

  16. Main differences & similarities • Co-registered 250km each side of nadir • Swath width: MERIS has over twice AATSR’s • MERIS 1150km; AATSR 500km • Pixel size – over 10 MERIS pixels per AATSR • MERIS 0.29km; AATSR 1km • AATSR has thermal channels • AATSR has dual-angle view

  17. Overlapping Channels

  18. AATSR/MERIS – potential synergy Ocean productivity: • Temperature has influence on bio-activity (biophysical interactions) Atmospheric water vapour • MERIS product, can also be derived from A ATSR Atmospheric aerosols • AATSR can detect aerosols but cannot constrain all the variables • MERIS aerosol product would elucidate this • Along-track view has potential for atmos correction over land

  19. ENVISAT 2003 - Monthly means MERIS Chlorophyll AATSR SST

  20. Separation of Bi-directional Reflectance from atmospheric effects using dual view North et al Forward and Nadir ToA reflectances Gerund reflectance Optical Depth Top of atmosphere  = 555nm Retrieved ground reflectance

  21. Total AtmosphericWater Vapour from ATSR I J Barton, CSIRO

  22. Atmospheric Aerosols - from ATSR dual-nadir SST difference

  23. ATSR2 SST (dual-nadir) vs TOMS Aerosol Comparison

  24. AATSR/MERIS – potential synergy - 2 AATSR cloud detection • Analysis and refinement of AATSR cloud-clearance scheme could benefit from MERIS ‘sub-pixel resolution • AATSR Land-surface temperature Land non-uniformity is a major issue • MERIS could provide indication of non-umiformity at AATSR sub-pixels scale

  25. Summary and Conclusions • AATSR exploitation programme now mature • Co-registration of MERIS offers great opportunities • Several projects already exist with strong need or alternative. Co-registered aerosol measurements. • AATSR has archive (15+ years of SST/LST; 10+ of land reflectivity) can, in principle, allow MERIS records to extrapolated backwards. • Data continuity is an urgent issue • GMES-1 and Sentinel 3 satellite are key to future data availability.

More Related