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Metop-B SIOV Meeting 13 November 2012, College Park, US

Metop-B SIOV Meeting 13 November 2012, College Park, US. Metop-B AVHRR Radiances in SST Bands: Preliminary Evaluation in MICROS (Update) www.star.nesdis.noaa.gov/sod/sst/micros/ ( www.star.nesdis.noaa.gov/sod/sst/xliang/test/micros_v6/ ) Xingming Liang and Sasha Ignatov

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Metop-B SIOV Meeting 13 November 2012, College Park, US

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  1. Metop-B SIOV Meeting 13 November 2012, College Park, US Metop-B AVHRR Radiances in SST Bands: Preliminary Evaluation in MICROS (Update) www.star.nesdis.noaa.gov/sod/sst/micros/ (www.star.nesdis.noaa.gov/sod/sst/xliang/test/micros_v6/) Xingming Liang and Sasha Ignatov NOAA/NESDIS and CSU/CIRA With contributions from: SST – J. Stroup, Y. Kihai, B. Petrenko, J. Sapper, P. Dash CRTM – Y. Chen, P. Van Delst, M. Liu, D. Groff, F. Weng AVHRR Cal/GSICS – T. Chang, F. Wu, F. Yu, L. Wang, J. Xiong, C. Cao, T. Hewison Metop-B in MICROS

  2. MetopB Data Availability (High Res.) • NRT processing for MetopB has been added in MICROS V6 since Nov. 19, 2012. • MetopB data are stable, except for Nov. 12 (~1.50 hr missing). • Data gaps and unstable proc. time are mainly due to NOAA unstable network. 19 November 2012 Metop-B in MICROS 2

  3. MetopB Data Availability (GAC) • The MetopB GAC data are also stable. • Proc. time for MetopB GAC is ~7 times less than FRAC. 19 November 2012 Metop-B in MICROS 3

  4. M-O Biases and Double Differences (“DD”) • Model minus Observation (“M-O”) Biases • M (Model) = Community Radiative Transfer Model (CRTM) simulated TOA Brightness Temperatures (w/ Reynolds SST, GFS profiles as input) • O (Observation) = Clear-Sky sensor (AVHRR, MODIS, VIIRS) BTs • Double Differences (“DD”) for Cross-Platform Consistency • “M” used as a “Transfer Standard” • DDs cancel out/minimize effect of systematic errors & instabilities in BTs arising from e.g. • Errors/Instabilities in Reynolds SST & GFS • Missing aerosol • Possible systemic biases in CRTM • Updates to ACSPO algorithm • Metop-A and B fly the same orbit so should be very consistent Metop-B in MICROS

  5. Global M-O Biases compared to other platforms Metop-A Metop-B • Global distribution is compared with Metop-A • Cross-platform consistencies in IR37 and IR12 are within ~0.1 K. MetopB IR11 is out of family by ~+0.23K. • Angle dependencies is consistent with Metop-A, MODIS and VIIRS except for IR11. SST from NPP/VIIRS

  6. Channel 3B (3.7 µm) Night SST from NPP/VIIRS

  7. Night DD’s @3.7 µm – Low-Res (Ref=Metop-A GAC) Metop-B: ~+0.07K • In Ch 3B, Metop-B is warmer than Metop-A by +0.07K • It is unclear whether this delta is coming from differences in sensors or CRTM Metop-B in MICROS

  8. Night DD’s @3.7 µm – Hi-Res (Ref=Metop-A GAC) Metop-B: ~+0.07K • In Ch 3B, Metop-B is warmer than Metop-A by +0.07K • It is unclear whether this delta is coming from differences in sensors or CRTM Metop-B in MICROS

  9. Channel 4 (11 µm) Night SST from NPP/VIIRS

  10. Night DD’s @11 µm – Low-Res (Ref=Metop-A GAC) Metop-B: ~+0.23K • In Ch 4, Metop-B is warmer than Metop-A by +0.23K • It is unclear whether this delta is coming from differences in sensors or CRTM Metop-B in MICROS

  11. Night DD’s @11 µm – Hi-Res (Ref=Metop-A GAC) Metop-B: ~+0.23K Aqua & Terra: in family after switching from CRTM 2.02 to 2.1 • In Ch 4, Metop-B is warmer than Metop-A by +0.23K • It is unclear whether this delta is coming from differences in sensors or CRTM • Note that MODISs were ~0.5K out of family before CRTM 2.1 was implemented Metop-B in MICROS

  12. Channel 5 (12 µm) Night SST from NPP/VIIRS

  13. Night DD’s @12 µm – Low-Res (Ref=Metop-A GAC) Metop-B: ~-0.08K • In Ch 4, Metop-B is cooler than Metop-A by -0.08K • It is unclear whether this delta is coming from differences in sensors or CRTM Metop-B in MICROS

  14. Night DD’s @12 µm – Hi-Res (Ref=Metop-A GAC) Metop-B: ~-0.08K Aqua & Terra: closer in family after switching from CRTM 2.02 to 2.1 • In Ch 4, Metop-B is cooler than Metop-A by -0.08K • Unclear whether this delta is coming from differences in sensors or CRTM Metop-B in MICROS

  15. SST = Linear Combination of 3 Bands • Night • Now calculated using Metop-A regression coefficients • Biased warm by 0.25K • New Metop-B SST coefficients was updated on Nov.14, using 27/10/2012 to 11/10/2012 Metop-B BTs. SST from NPP/VIIRS

  16. Night DD’s @SST – Low-Res (Ref=Metop-A GAC) Metop-B: ~+0.25K • Metop-B SST is ~+0.25K warmer than Metop-A • Calculated using Metop-A regression coefficients • Will recalculate regression coefficients when have enough match-ups (1 month+) Metop-B in MICROS

  17. Night DD’s @SST – Hi-Res (Ref=Metop-A GAC) Metop-B: ~+0.25K • Metop-B SST is ~+0.25K warmer than Metop-A • Calculated using Metop-A regression coefficients • Will recalculate regression coefficients when have enough match-ups (1 month+) Metop-B in MICROS

  18. Night DD’s @SST – GAC & Hi-Res Metop-B back to family after SST coeff. was updated. • Metop-B SST Coeff. was updated on Nov. 14, and brought it back to family. Metop-B in MICROS

  19. Summary • NRT processing for MetopB was added in MICROS V6 • Data are available in MICROS V6 since Nov. 19, 2012. • MetopB (GAC & FRAC) are stable. • DDs was used to check MetopB consistency with other • Ch 3B is +0.07K warmer than Metop-A • Ch 4 is +0.23K warmer than Metop-A – “out of family” • Ch 5 is -0.08K cooler than Metop-A – “in family” • SST was back in family after SST coeff. was updated on Nov. 14, 2012 Actions • Check with CRTM Team if CRTM coefficients for Metop-A and -B were calculated consistently • If they are, then work with CAL Team to resolve (especially Ch 4) • Work with MCST to resolve Terra-Aqua 3.7 µm 0.3K inconsistency Metop-B in MICROS

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