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Effect of NPP WUCD events on SST and BTs as seen in SQUAM and MICROS

JPSS VIIRS SDR and SST Teams Telecons 17 April 2013. Effect of NPP WUCD events on SST and BTs as seen in SQUAM and MICROS. SQUAM - www.star.nesdis.noaa.gov/sod/sst/squam. MICROS - www.star.nesdis.noaa.gov/sod/sst/micros.

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Effect of NPP WUCD events on SST and BTs as seen in SQUAM and MICROS

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  1. JPSS VIIRS SDR and SST Teams Telecons17 April 2013 Effect of NPP WUCD events on SST and BTsas seen in SQUAM and MICROS SQUAM - www.star.nesdis.noaa.gov/sod/sst/squam MICROS - www.star.nesdis.noaa.gov/sod/sst/micros Prasanjit Dash1,2, Xingming Liang1,2, Alexander Ignatov1 , John Stroup1,3 1NOAA/NESDIS, Center for Satellite Applications & Research (STAR) 2Colorado State Univ, Cooperative Institute for Research in the Atmosphere (CIRA) 3STG, Inc, MD, USA (Emails: FirstName.LastName@noaa.gov) WUCD effects on SSTs and BTs

  2. SQUAM: VIIRS SST – OSTIA (WUCD 19 Mar 2013) 14 Mar 2013 - “Regular Day” 19 Mar 2013 - “WUCD Day” ΔSST ~+0.25K WUCD effects on SSTs and BTs

  3. SQUAM: Daily Global Stats of VIIRS SST - OSTIA 2012/2/10 2012/5/22-25 2013/3/18-20 2012/12/17-19 2012/9/10-12 Initial large spike in global mean biases in Feb 2012. After code fixes, SST spikes reduced to ~0.2-0.3K. NB: These are daily global statistics. Local spikes are likely larger (no special analysis done). SST Mean Bias wrt. Reference SST Large spike in global Std Dev Feb 2012. After code fixes, SST spikes not seen. SST Std Dev wrt. Reference SST WUCD effects on SSTs and BTs

  4. MICROS: VIIRS SST - Reynolds 2013/3/18-20 2012/12/17-19 2012/9/10-12 2012/5/22-25 SQUAM observations are consistent with MICROS (where SST is also monitored but only wrt Reynolds): Effect of WUCD on global SST mean biases is ~0.2-0.3K. NB: These are again daily global statistics. Local spikes may be larger (but no special analysis was done). WUCD effects on SSTs and BTs

  5. MICROS:Double Diff. VIIRS IR11 BT ; ref: Metop-A 2013/3/18-20 2012/9/10-12 2012/12/17-19 2012/5/22-25 However, major objective of MICROS is to monitor BTs. Effect of WUCD on global BT mean biases is ~0.1K. These are again daily global statistics. Local spikes may be larger (but no special analysis was done). WUCD effects on SSTs and BTs

  6. Observations • WUCD appears to continue affecting global BT mean biases with an amplitude of ~0.1K • In SST, these artifacts are amplified, due to the nature of SST regression equation, to 0.2-0.3K • These are global daily statistics. Local effects maybe larger but separate analysis is needed WUCD effects on SSTs and BTs

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