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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

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Calipso status and plans dave winker

CALIPSO Status and Plans Dave Winker

Winds Working Group, 16-17 June 2009, Wintergreen, VA


Calipso highlights
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


Calipso data used in 47 countries
CALIPSO Data Used in 47 Countries

China

USA

Japan

(as of Sept 2008)


Jtech special issue on calipso algorithms
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


Laser data production status
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


Lom 2 pulse energy trend
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




Caliop version 3 data products
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


Caliop version 3 data products cont d
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


Restructured profile products
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


Boundary layer cloud clearing
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


Trade cumulus scene
Trade cumulus scene

V2.01

aerosol

cloud

V3 (correct)

[email protected]

13


Impact of bug fixes on low cloud distribution
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)



Penetration statistics
Penetration statistics

Global average

(single shots)

CALIPSO LITE

6 km 58% 90%

4 km 52 85

2 km 43 77

Sfc 31 40

Zonal average penetration frequency

(5-km average profiles)

CALIPSO LITE

orbit 705 km 260 km

energy 110 mJ 500 mJ


Version 3 ice water phase algorithm
Version 3 Ice/Water Phase Algorithm

Oriented crystals

HOI

water

ice

water

ROI

IAB 

d

(Yong Hu, et al., Optics Express, 2007)

(Yong Hu, et al., JTech, 2009)


Reduced artifacts in cloud ice water phase
Reduced artifacts in cloud Ice/Water phase

Oriented ice now properly classified (HOI  water in V2)

Version 2.01 Version 3

Number of ‘ice’ clouds with tops below 3.25 km




Calipso provides new tests of model aerosols
CALIPSO provides new tests of model aerosols

East Pacific (130-180W)

East Asia (110E – 130E)

CALIPSO

GMAO

RAQMS

monthly zonal mean extinction

(courtesy C. Kittaka)


Looking toward a long term lidar data record
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


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