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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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Brian.J.Getzewich@nasa.gov 13

Trade cumulus scene

V2.01

V3 (correct)

cloud aerosol

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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