Comparison of AIRS and MODIS Cloud Top Properties By Van Dang With - - PowerPoint PPT Presentation

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comparison of airs and modis cloud top properties
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Comparison of AIRS and MODIS Cloud Top Properties By Van Dang With - - PowerPoint PPT Presentation

Sep 17, 2022 45 likes •353 views

Comparison of AIRS and MODIS Cloud Top Properties By Van Dang With lots of advice and help from: Brian Kahn, Eric Fetzer, Evan Manning, Mathias Schreier, and John Blaisdell MODIS ECF AIRS ECF MODIS CTT AIRS CTT HISTOGRAM OF MODIS ECF THAT

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Comparison of AIRS and MODIS Cloud Top Properties

By Van Dang With lots of advice and help from: Brian Kahn, Eric Fetzer, Evan Manning, Mathias Schreier, and John Blaisdell

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MODIS ECF AIRS ECF AIRS CTT MODIS CTT

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HISTOGRAM OF MODIS ECF THAT ARE MATCHED WITH AIRS ECF

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Methods of comparing AIRS’ and MODIS’ Cloud Top Properties

  • Comparing cloud property measurement within an AMSU footprint
  • btained by averaging all the 9 ECF from AIRS FOV regridded to

the nearest .5 degree lat/lon bin with all the averaged MODIS ECF that falls within that .5 lat/lon bin.

  • Comparing the cloud property measurement within an AMSU

footprint obtained by averaging all the 9 ECF from AIRS FOV to the corresponding MODIS footprints weighted according to each individual AIRS top-hat and then averaged. The top-hat function was based on the AIRS channels for cloud property derivation and compared to MODIS’ channel number 32 (12.02µm)

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Both filtered for when collection of MODIS data within .5 degree reports 90%

  • f one cloud layer.

.5 deg data

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.5 deg data

Filtering by AIRS reporting

  • ne cloud layer

Filtering by AIRS reporting

  • ne cloud layer and MODIS

using CO2 slicing to derive values

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.5 deg data

Filtering by AIRS reporting

  • ne cloud layer

Filtering by AIRS reporting

  • ne cloud layer and MODIS

using CO2 slicing to derive values

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Filtered by AIRS indicating two cloud layer measurement

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Filter by PBest Filter by being neither PBest nor PGood

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Coloring of circles represents AIRS ECF

.5 deg data

No Filtering Filtering by AIRS reporting

  • ne cloud layer
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Filtering by AIRS reporting

  • ne cloud layer and MODIS

using CO2 slicing to derive values

.5 deg data

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Conclusion:

  • AIRS and MODIS ECF compares well if the cloud is high
  • AIRS and MODIS CTT compares well if the ECF were large and that

there is one cloud layer