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Some Early Results Assimilating ACSPO VIIRS L2P Datasets

Some Early Results Assimilating ACSPO VIIRS L2P Datasets. Bruce Brasnett Canadian Meteorological Centre May, 2014. ACSPO VIIRS L2P Datasets. Received courtesy of colleagues at STAR Two periods: 1 Jan – 31 Mar 2014 and 15 Aug – 9 Sep 2013 Daily coverage is excellent with this product

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Some Early Results Assimilating ACSPO VIIRS L2P Datasets

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  1. Some Early Results Assimilating ACSPO VIIRS L2P Datasets Bruce Brasnett Canadian Meteorological Centre May, 2014

  2. ACSPO VIIRS L2P Datasets • Received courtesy of colleagues at STAR • Two periods: 1 Jan – 31 Mar 2014 and 15 Aug – 9 Sep 2013 • Daily coverage is excellent with this product • Experiments carried out assimilating VIIRS data only and VIIRS data in combination with other satellite products • Rely on independent data from Argo floats to verify results • Argo floats do not sample coastal regions or marginal seas

  3. Coverage for 2014/02/01 • Text NAVO AVHRR19 ACSPO VIIRS

  4. Assessing relative value of 2 VIIRS datasets: NAVO vs. ACSPO Warm Bias above 60°N NORTH SOUTH Using ACSPO instead of NAVO improves assimilation

  5. Assessing the relative value of 3 datasets for January-March 2014 Warm Bias above 60°N NORTH SOUTH Using ACSPO improves STD in all LAT bands, except at 10°S

  6. Summer Sample: Aug. 15- Sept. 9, 2013. VIIRS vs. NAVO AVHRR GAC Warm Bias above 60°N NORTH SOUTH ACSPO VIIRS assimilation comparable to NAVO AVHRR, except at hi-lat

  7. Assessing potential benefit of adding VIIRS to CMC analysis Warm Bias above 60°N NORTH SOUTH ACSPO improves assimilation in all LAT bands, except hi-lat North (high bias)

  8. Assessing utility of ACSPO SSES bias estimate Warm Bias above 60°N NORTH SOUTH De-biasing VIIRS SST using ACSPO SSES bias does not affect assimilation

  9. Assessing utility of screening daytime retrievals using L2P wind speeds Warm Bias above 60°N NORTH SOUTH Using only daytime data with wind > 6m/s improves the assimilation

  10. Summary • ACSPO VIIRS L2P is an excellent product • Based on the Jan – Mar 2014 sample, VIIRS contains more information than either the NAVO VIIRS, OSI-SAF MetOP-A or the RSS AMSR2 datasets • L2P ancillary information: quality level flags and wind speeds are useful • Experiment with SSES bias estimates was inconclusive • Current plan at CMC is to assimilate ACSPO VIIRS L2P dataset when it becomes available

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