1. Summary of Terra and Aqua MODIS Long-term Performance Jack Xiong 1 , Brian Wenny 2 , Sri Madhaven 2 , Amit Angal 3 , William Barnes 4 , and Vincent Salomonson 5 1. NASA /GSFC; 2. Sigma Space Corp; 3. SSAI; 4. UMBC; 5. U. of Utah Other Contributors: Members of MCST IGARSS 2011, July 24-29, 2011, Vancouver, Canada
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3. Terra and Aqua MODIS Aqua Terra Terra: over 11 years of successful operation Aqua: over 9 years of successful operation MODIS observations: 36 spectral bands: 0.41 to 14.5 m ( VIS to LWIR ) 3 spatial resolutions: 0.25, 0.5, and 1 km Nearly 40 data products for land, ocean, and atmospheric applications Page
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5. On-orbit Calibration Activities SDSM Scan Mirror Solar Diffuser SRCA Blackbody Space View SD/SDSM: Weekly to tri-weekly SRCA: Radiometric: monthly Spatial: bi-monthly Spectral: quarterly Moon: monthly (nighttime orbits) 0-20 o spacecraft roll maneuvers 55 o phase angle BB: quarterly WUCD Spacecraft maneuvers: Yaw (SD BRF, VF) Roll (Moon) Pitch (only applied to Terra) Page
6. On-orbit Calibration Activities Page Frequencies to operate on-board calibrators are gradually reduced for both Terra and Aqua MODIS as a result of their extended missions Spacecraft Maneuvers: Yaw (SD BRF, VF), Roll (Moon), Pitch (only applied to Terra) Ground Calibration Targets: Dome C and Desert Sites As of June 30, 2011 SD / SDSM MOON BB WUCD SRCA RAD SRCA SPEC SRCA SPAT Terra 325 103 76 135 48 63 Aqua 216 83 39 107 27 45
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8. Instrument Temperatures Page 3.5 K increase over 11 years 2.0 K increase over 9 years T-MODIS A-MODIS Similar trends for warm FPA, scan cavity, and mirror temperatures VIS, NIR T-MODIS A-MODIS VIS, NIR
9. Cold FPA Temperatures Page T-MODIS A-MODIS SMIR , LWIR SMIR , LWIR Short-term: granule averaged Extremely stable Short-term: granule averaged Less stable (recent loss of cooler margin)
10. Blackbody Temperatures (nominal operation) Page B-Side Short-term: granule averaged Short-term: granule averaged < 30 mK increase over 11 yr T-MODIS A-MODIS Extremely stable Aqua MODIS BB performance is extremely stable (long- and short-term)
11. Solar Diffuser (SD) Degradation Page Larger degradation at shorter ; More SD degradation in Terra MODIS Increased SD degradation due to SD door fixed at “open” position SD degradation as a function of wavelength T-MODIS A-MODIS SD degradation (mission-long trend) Gradually reduced SD calibration frequency as mission continues
12. On-orbit Changes in RSB (VIS, NIR, and SWIR) Responses Page Wavelength, angle of incidence (AOI), and mirror side dependent
13. On-orbit Changes in TEB (MWIR and LWIR) Responses Page Excluding changes due to use of different operational configurations, changes in TEB responses are relatively small (compared to RSB); PV bands (20-25 and 27-30) are more stable than PC bands (31-36)
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15. On-orbit Changes in Spectral Band CW and BW Page Aqua MODIS on-orbit changes in both CW and BW are less than 0.5 nm for most VIS/NIR spectral bands Terra MODIS VIS and NIR spectral bands Changes in center wavelength (CW) are less than 0.5 nm for most VIS/NIR Changes in bandwidth (BW) are less than 1.0 nm for most VIS/NIR
16. On-orbit Changes in Band-to-Band Registration (BBR) Page Large BBR offsets in A-MODIS between cold FPA and warm FPA band pairs (a known problem since pre-launch); offsets remain stable Terra MODIS along-scan BBR Terra MODIS along-track BBR
17. Page Robert Wolfe et al. T-MODIS track RMS: 43/42m (C5/C6); scan RMS: 44/42m (C5/C6) A-MODIS track RMS: 47/45m (C5/C6); scan RMS: 53/51m (C5/C6); and small N/S hemispherical differences Terra MODIS Geolocation Results
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