calipso status and plans dave winker
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CALIPSO Status and Plans Dave Winker. Winds Working Group, 16-17 June 2009, Wintergreen, VA. CALIPSO Highlights. Baseline 3-year mission completed, mission extension approved Switched to backup laser, March 2009 Third anniversary of “first light”: 7 June - PowerPoint PPT PresentationTRANSCRIPT
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CALIPSO Status and Plans Dave Winker
Winds Working Group, 16-17 June 2009, Wintergreen, VA
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CALIPSO Highlights
Baseline 3-year mission completed, mission extension approved
Switched to backup laser, March 2009
Third anniversary of “first light”: 7 June
> 120 CALIPSO papers in print or submitted
JTech special issue on CALIPSO instruments and algorithms
JGR special issue “CALIPSO and the A-train” underway– 35 papers submitted and under review
Joint CP-CS science team meeting, 28-31 July, Madison
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CALIPSO Data Used in 47 Countries
USAChina
Japan
(as of Sept 2008)
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JTech special issue on CALIPSO algorithms
8 papers now in press– Winker et al., 2009: Overview of the CALIPSO mission and CALIOP data
processing algorithms
– Hunt, et al. - lidar instrument and performance
– Powell, et al.- Lidar 532 nm calibration
– Liu, et al. - Cloud and Aerosol Discrimination Algorithm
– Young and Vaughan - extinction retrieval algorithm
– Vaughan, et al. – layer detection algorithm
– Hu et al. - Version 3 I/W phase algorithm
– Omar, et al – aerosol typing algorithm
Several more papers underway:– CALIOP detection
– IIR and WFC instruments and algorithms
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Laser/Data Production Status
LOM-2 turned off 16 Feb 2009– Laser operation became erratic due to slow pressure leak in canister
LOM-1 turn-on operations commenced, 9 March
Data acquisition with LOM-1 since 12 March
LOM-1 performance as-good or better than initial LOM-2– LOM-1 pressure holding well (better than predicted)
Data acquired since 12 March has now been processed, to be released soon
Current processing: L1 using Version 3 code, L2 using V2.02
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LOM-2 Pulse Energy Trend
• 1.61 billion shots on-orbit• energy decreased 6.5% (14.7 mJ)• 10 (out of 192) bar drops over life• no adjustments required
adjustment threshold
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Laser Energy Comparison
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Laser Canister Pressure
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CALIOP Version 3 Data Products
Current version: 2.02
Version 3 data products to be released soon– All lidar data from beginning of mission will be reprocessed
Level 1 data– Goal for calibration uncertainty, radiometric stability: 5%
– Improved 532 nm daytime calibration> 30 km Rayleigh calibration can only be done at night
> Daytime uncertainties improved from 10% to 5%
– 1064 nm calibration: significant biases remain> Initial approach using cirrus targets determined to be unreliable
> Investigating new approaches (sea surface, etc.)
– Version 3 processing of March-May 2009 completed> Level 1 data to be released this week
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CALIOP Version 3 Data Products (cont’d)
Level 2 data– New:
> particle depolarization, particle color ratio
> IWC/IWP, shape parameter (ice), column OD
– Uncertainties provided for most parameters
– Many bugs fixed
– New I/W phase algorithm: adds random and oriented ice
– Aerosol and cloud profile products restructured and improved> Aerosol horizontal averaging reduced
> Many additional parameters
> Data quality information now included
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Restructured Profile Products
Version 2 profile products: – Profiles of aerosol and cloud 532 and 1064 extinction and backscatter only
– Cloud profiles reported at 5 km
– Aerosol profiles averaged to 40 km
Both aerosol and cloud profile products now retrieved at 5-20-80 km and reported at 5-km horizontal resolution
Additional profiles:– 532 nm perpendicular backscatter and particle depolarization
– Aerosol/cloud mask
– Aerosol/cloud type
Data quality information– CAD score
– Ext_QC flag
– Feature type QA flags
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Boundary layer cloud clearing
In Version 2, clouds below 4 km not cleared properly Cloud-contaminated aerosol classified as ‘cloud’ Cloud-clearing scheme fixed in Version 3
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Impact of bug fixes on low cloud distribution
Version 2.01
Global mean = 0.456
(low clouds)
Version 3, alpha-3 test
Global mean = 0.374
(low clouds)
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Fractional change, V2.01 alpha-2
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Penetration statistics
Zonal average penetration frequency (5-km average profiles)
Global average
(single shots)
CALIPSO LITE
6 km 58% 90%
4 km 52 85
2 km 43 77
Sfc 31 40
CALIPSO LITE
orbit 705 km 260 km
energy 110 mJ 500 mJ
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Version 3 Ice/Water Phase Algorithm
(Yong Hu, et al., Optics Express, 2007)
water ice
IAB
Oriented crystals
HOI
water
ROI
(Yong Hu, et al., JTech, 2009)
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Reduced artifacts in cloud Ice/Water phase
Number of ‘ice’ clouds with tops below 3.25 km
Oriented ice now properly classified (HOI water in V2)
Version 2.01 Version 3
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I/W phase algorithm: Zonal fraction of ice, water
V2 (Jan)
V3 (Aug)
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CALIPSO clouds vs. LMD GCM clouds
CALIPSO LMD GCM
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CALIPSO provides new tests of model aerosols
East Pacific (130-180W)
CALIPSO
GMAO
RAQMS
East Asia (110E – 130E)
monthly zonal mean extinction (courtesy C. Kittaka)
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Looking toward a long-term lidar data record
Potential CALIPSO life through 2012/13
The WMO-GALION program has recognized that a long-term record from ground lidars is necessary to provide a translation between the CALIPSO and ADM/EarthCare aerosol records
As part of GALION, the EARLINET network has been taking ground-based measurements beginning in July 2006
CALIPSO ADM EARTHCARE ACE Impacts
Launch 2006 2011 2013/14 2020?
Objective Aerosol and cloud
winds Aerosol and cloud
Aerosol and cloud
Lidar backscatter Doppler HSRL HSRL
Wavelength 532/1064 355 355 355/532/1064 Aerosol properties
Depolarization yes no yes yes I/W phase, dust