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May 04, 2020 - ATTENTION:
Due to errors seen in the Level 0 data from the WFC starting on April 11th, 2020 CALIPSO has suspended processing and distribution of the Level 1 standard and expedited WFC products. IIR Level 2 processing scripts have been modified to ignore the loss of the WFC data stream with minimal impact to the data. Browse images will continue to be generated without the WFC contribution.

June 20, 2018 - ATTENTION: ONGOING
CALIOP is experiencing an elevated frequency of low energy laser shots within and near the South Atlantic Anomaly (SAA) region which has degraded the science quality of affected profiles since September 2016. Please see the Low Laser Energy Advisory page for further information and guidance for identifying affected profiles.

CALIPSO LIDAR BROWSE IMAGES (PRODUCTION - STANDARD - Science Ready)

This site contains combined browse images of the CALIPSO lidar (CALIOP), Infrared Imaging Radiometer (IIR), and Wide Field Camera (WFC). The CALIOP images primarily comprise the total 532 nm attenuated backscatter signal (the sum of the 532 nm parallel and perpendicular return signals), the perpendicular 532 nm attenuated backscatter signal, and the total 1064 nm attenuated backscatter signal from CALIOP from the Level 1B products, as well as masked information derived from the Level 2 products. A full tutorial of image content is provided here.

The lidar signal strength has been color coded such that blues correspond to molecular scattering and weak aerosol scattering, aerosols generally show up as yellow/red/orange. Stronger cloud signals are plotted in gray scales, while weaker cloud returns are similar in strength to strong aerosol returns and coded in yellows and reds.

The CALIOP 532 nm channels do not recover instantaneously from very strong returns such as those from ocean and land surfaces. Instead, there is a decay which is approximately exponential. Due to this effect, there is often apparent lidar return from beneath the surface. This effect is particularly noticeable in Antarctica where frequent cloud-free atmospheres and a highly reflective surface result in surface signals which apparently extend significantly below the true surface.

When the atmosphere is not clear, varying atmospheric attenuation will modulate the strength of the surface return and the magnitude of the transient recovery. Return signals from very strongly scattering clouds can also produce this effect, although it is not always apparent.

The V4 browse images contain overplots of CloudSat radar reflectivity and cloud mask data. The CloudSat data, taken from the most recent version of the 2B-GEOPROF data products, are imposed on CALIPSO day and night browse images from June 2006-April 2011, and then only daytime from November 2011 onward when CloudSat went to daylight data collection only. CALIPSO will process and post these images as the CloudSat data becomes available.

Two versions of the standard CALIPSO browse images are currently supported. The Version 4.1 CALIOP products use the meteorological reanalysis product MERRA-2 (Modern-Era Retrospective analysis for Research and Applications, Version 2) from GMAO, which introduces a 3-4-month delay in generation and distribution of several CALIPSO products. Users are encouraged to use the Version 4.1 CALIOP data products as these provide most up to date improvements since Version 3. To account for this delay the standard Version 3.41 images will also be posted, but should be treated as expedited products and should not be used in rigorous scientific studies. They are generated 2 to 3 days from science data downlink, but will only be available for the last 6 months at a time.

DATA RELEASE IMAGE AVAILABILITY

Version 4.1 - Versions 4.10 and V4.11; June 13, 2006 thru Current
Version 3.4 - Version 3.41; sliding 6-month window



SELECT DATA RELEASE VERSION TO VIEW IMAGES
VERSION 4:       V4.1
VERSION 3:       V3.4






Last Updated: May 28, 2021


NASA
Last Updated: October 26, 2021
Curator: Charles R. Trepte
NASA Official: Charles R. Trepte

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