hyperspectral cloud top retrievals
DESCRIPTION
Hyperspectral Cloud Top Retrievals. Robert E. Holz, Steve Ackerman, Matthew McGill, Paolo Antonelli and Fred Nagle. Overview. Part 1. CO 2 Sorting + Slicing cloud height retrieval validation Part 2. Night time polar cloud height detection using AIRS hyperspectral measurements. - PowerPoint PPT PresentationTRANSCRIPT
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Hyperspectral Cloud Top Retrievals
Robert E. Holz, Steve Ackerman, Matthew McGill,
Paolo Antonelli and Fred Nagle
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Overview
Part 1. CO2 Sorting + Slicing cloud height retrieval validation
Part 2. Night time polar cloud height detection using AIRS hyperspectral measurements
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CO2 Channel Selection Algorithm (CO2 Sorting)
The Sorted Clear Sky Spectrum
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High and Thick Cloud
CO2 Sorting: Sensitivity to Brightness Temperature
High and Thick Cloud
Thinner Cloud
High and Thick Cloud
Thinner Cloud
Low Cloud
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Selected CO2 ChannelsHigh Cloud
Mid Level Cloud
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February 22, 2003
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S-HIS - CPL February 22, 2003
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S-HIS - CPL Cloud OD < 1.0
(km)
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S-HIS Cloud Top OD Sensitivity
.
Altitu
de
0.2 0.4
0.6
0.8 1.
0 1.2
CPL OD Contours
SHIS - CPL
SHIS Cloud Top Retrieval
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S-HIS Cloud Top OD
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Distribution of S-HIS Cloud Level Optical Depth February 22
CPL optical depth at the S-HIS cloud height
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Part 2: Night Time Polar Cloud
Height Retrievals Using AIRS
Hyperspectal Measurements
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One BT could be 3 different cloud heights
Polar Cloud Height Retrieval Problem
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AIRS Polar Cloud Height Retrieval 14:00 UTC
AIRS Polar Cloud Height Retrieval 22:00 UTC
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Conclusions and Future Plans
• The combined CO2 slicing + sorting cloud top retrieval improves the CO2 slicing results for optically thin clouds
• Lidar retrieved integrated cloud optical depth is a more representative measure of cloud top retrieval performance.
• It is possible to detect temperature inversions above arctic stratus using hyperspectral measurements
• The inversion information reduces the uncertainty in the arctic stratus IR cloud top retrievals
• Future:
– Apply the CO2 sorting + slicing retrieval to AIRS satellite data
– Integrate the CO2 sorting + slicing retrieval with the arctic inversion detection