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Post-Provisional CBH Evaluation

Post-Provisional CBH Evaluation. Curtis Seaman, Yoo-Jeong Noh, Steve Miller, Dan Lindsey 12 February 2014. CloudSat /VIIRS CBH validation. Collocated VIIRS pixels/ CloudSat profiles where the two satellites are within 15 min define “match-up periods”

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Post-Provisional CBH Evaluation

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  1. Post-Provisional CBH Evaluation Curtis Seaman, Yoo-Jeong Noh, Steve Miller, Dan Lindsey 12 February 2014

  2. CloudSat/VIIRS CBH validation • Collocated VIIRS pixels/CloudSat profiles where the two satellites are within 15 min define “match-up periods” • Match-up periods occur for ~4.5 hours every 2-3 days • Results shown here include all match-up periods from September 2013 • CloudSat profiles where precipitation is detected are excluded • CloudSat cannot detect CBH in precipitation • VIIRS retrievals of clouds with CTH below 1 km AGL are excluded • CloudSat cannot detect these clouds due to ground clutter • Collocated pixel/profile pairs where CloudSat and VIIRS both detected cloud and retrieved CTH and CBH without error are “valid matchup points” • Daytime CBH retrievals only • CloudSat does not operate at night due to battery issues • The comparison shown here is between the IDPS CBH algorithm using IDPS retrievals as input and the IDPS CBH algorithm using PATMOS-x retrievals as input Match-up locations Sept. 2013

  3. IDPSvs PATMOS-x (September 2013) VIIRS IDPS CTH PATMOS-X (NDE) CTH VIIRS IDPS CBH CIRA’s IDPS CBH with PATMOS-X input

  4. IDPSvs PATMOS-x (September 2013) Δ CTH Δ CBH Δ geometric thickness

  5. “All Clouds” vs. “Within Spec” • The VIIRS CBH algorithm has been evaluated for two groups: • All clouds observed by CloudSat and VIIRS • Only those clouds where the VIIRS CTH retrieval is within the error specifications (aka “Within Spec”) • Error specifications: CTH must be within 1 km if the COT is greater than 1, or within 2 km if the COT is less than 1 • Thus, “All Clouds” results show the general performance of the CBH retrieval, “Within Spec” results show the performance of the CBH retrieval when the CTH retrieval is accurate • CBH accuracy is very closely related to CTH accuracy • CBH is within the error specifications if CBH error is less than 2 km

  6. All Clouds CBH statistics IDPS PATMOS-x

  7. All Clouds CBH statistics IDPS PATMOS-x Negative errors indicate CloudSat CBH was lower than VIIRS CBH (VIIRS biased high relative to CloudSat)

  8. CBH Statistics when CTH is “within spec” All Cloud Types All Cloud Types IDPS PATMOS-x

  9. CBH Statistics when CTH is “within spec” IDPS PATMOS-x Negative errors indicate CloudSat CBH was lower than VIIRS CBH (VIIRS biased high relative to CloudSat)

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