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CLDPROP_L2 Issues

Tracking of known problems and subsequent fixes is an important issue for Continuity Atmosphere data users. This page will act as a repository of all known Continuity Atmosphere Data Product problems, as well as how to determine the problematic version (and the fixed version if available) of the NetCDF4 data -- therefore data users should check this page for updates regularly. Data Users unfamiliar with how to properly track problems and fixes by determining the version of their downloaded NetCDF4 files should refer to the documentation in the Introduction sublink (the top link along the LHS of this page).   Note that a checkmark (✔) in the tables below means Data Issue or Quality Statement applies.  A blank means it's been fixed or does not apply.




L2 Cloud Properties (CLDPROP_L2) Data Issues: Table of Contents & Anchor Links  (Note: Anchor Links point to a specific place within this page.)

Collection/Platform where Issues Apply
Issue Impact v1.1/MODIS v1.1/VIIRS v1.0/MODIS v1.0/VIIRS Link
#1. Very Intermittant CER Liquid < 4.0 microns

L

 

 

Link

#2. Erroneous Liquid Cloud Phase Results

H

 

 

Link

#3. Degraded Geolocation required Reprocessing

H

 

 

 

Link

L2 Cloud Properties (CLDPROP_L2) Data Quality Statements: Table of Contents & Anchor Links  (Note: Anchor Links point to a specific place within this page.)

Collection/Platform where Quality Statements Apply
Quality Statement Impact v1.1/MODIS v1.1/MODIS v1.0/MODIS v1.0/VIIRS Link
#1. None Found Yet

Q

 

 

 

 

 




Issue #1: Very Intermittantly Cloud Effective Radius Retrievals for Liquid Water Clouds drop below the expected minimum value of 4.0 microns

Description: In a very small number of cases, the Cloud Effective Radius Retrievals for Liquid Water Clouds drop below the expected minimum value of 4.0 microns. In the Continuity Cloud Retrieval Algorithm, only the Alternate Solution Logic (ASL) cuts off at 4.0 microns explicitly. The main solution logic (and this is for all of CHIMAERA) cuts off on library_radii(1), which in the case of MODIS and VIIRS (and several other heads) is 2.0 microns.  However, from selected case study results, this is a very rare event, occurring in less than 0.001% of cases.  This is only an issue in v1.0 data.

 

PGE Versions & Production Dates of Problematic & Corrected Data:

Problematic Data Corrected Data
PGE Versions Production Dates PGE Versions Production Dates
CLDPROP_L2 v1.0 ≤ 2019 001 (01/01/19) CLDPROP_L2 v1.1 All Dates Corrected

Data Dates Affected: 1 March 2012 (Day 061) and forward (All Data Dates)

Affected Platform: MODIS AQUA and VIIRS SNPP

Versions Affected: Version.1.0

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Issue #2: Erroneous Liquid Cloud Phase results

Description:  Issue with Cloud Optical Properties Thermodynamic Phase caused erroneous Liquid Cloud Phase results.   This was identified with a striking discontinuity in the Marginal Histograms of Ice Cloud Effective Radius around 20 microns.  This was corrected by restoring the Cold Cloud Sanity Check in the Cloud Optical Properties Thermodynamic Phase Algorithm.

PGE Versions & Production Dates of Problematic & Corrected Data:

Problematic Data Corrected Data
PGE Versions Production Dates PGE Versions Production Dates
CLDPROP_L2 v1.0 All Dates CLDPROP_L2 v1.1 All Dates Corrected

Data Dates Affected: All Data Dates

Affected Platform: MODIS Aqua & VIIRS SNPP

Versions Affected: Version.1.0

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Issue #3: Degraded Geolocation for VIIRS SNPP data between 20 Dec 2019 and 6 Jan 2020 required reprocessing

Description:  SNPP VIIRS Continuity Atmosphere L2 and L3 products had degraded geolocation data during the indicated time period which warranted a reprocessing.  Affected products have filenames that begin with AERDB, AERDT, CLDMSK, CLDPROP, and FSNRAD.  (Note that FSNRAD is the L2 VIIRS and CrIS fusion product for SNPP and J1 (NOAA-20), where FSN stands for “fusion”.)  Version 1.1 data during the indicated time period should be replaced by filenames with creation timestamps on or after January 8th 2020 (2020 008).

 

PGE Versions & Production Dates of Problematic & Corrected Data:

Problematic Data Corrected Data
PGE Versions Production Dates PGE Versions Production Dates
CLDPROP_L2 v1.1 < 2020 008 (01/08/20) CLDPROP_L2 v1.1 ≥ 2020 008 (01/08/20)

Data Dates Affected: 20 December 2019 (Day 354) starting at 13:54:00 UTC and forward through 6 Jan 2020 (Day 006) ending at 13:53:59 UTC

Affected Platform: VIIRS SNPP

Versions Affected: Version.1.1

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Quality Statement #1: None Found Yet

Description: .

Guidance to Users:

Data Dates Affected:

Affected Platform:

Versions Affected:

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