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The Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO)

CALIPSO, a joint mission between NASA and the French space agency, CNES, provides new insight into the role that clouds and atmospheric aerosols (airborne particles) play in regulating Earth's weather, climate, and air quality.



NEWS

October 17, 2018:
CALIPSO Lidar Level 2 STANDARD Version 4.20 Data Release

The CALIPSO mission team, in collaboration with the Atmospheric Science Data Center (ASDC) at NASA Langley Research Center and HYGEOS/AERIS/ICARE Data Center and Services Center, announces the release of an update to the standard Level 2 lidar data products.
Version 4.20 Lidar Level 2 Products

  • CAL_LID_L2_01kmCLay-Standard-V4-20
  • CAL_LID_L2_333mMLay-Standard-V4-20
  • CAL_LID_L2_05kmMLay-Standard-V4-20
  • CAL_LID_L2_05kmALay-Standard-V4-20
  • CAL_LID_L2_05kmCLay-Standard-V4-20
  • CAL_LID_L2_05kmAPro-Standard-V4-20
  • CAL_LID_L2_05kmCPro-Standard-V4-20
  • CAL_LID_L2_VFM-Standard-V4-20

The V4.20 CALIOP Level 2 products contain new laser energy science data sets. These science data sets provide information for filtering out low laser energy shots, a phenomenon which has impacted CALIOP data quality in the South Atlantic Anomaly region since mid-2017. A technical advisory of this phenomenon, and the recommended courses of action for mitigating its impace on science analyses, was posted on the CALIPSO website in June of 2018. In that advisory, it was noted that the existing V4.10 CALIOP Level 2 data set did not contain enough information to identify low laser energy shots without having to access the corresponding V4.10 CALIOP Level ` files. In order to provide a simpler method to exclude affected level 2 data, the new V4.20 CALIOP Level 2 files now includes science data sets for both 532 nm single shot energy (directly from the Level 1 product) and the minimum 532 nm laser energy for each 80 km chunk. This avoids the necessity to download both the CALIOP Level 1 and Level 2 data products in order to exclude affected profiles. All other science data sets within the V4.20 Level 2 prdoucts are identival to those of the V4.10 Level 2 products.

The products are available beginning with data from January 1, 2017 and as of this announcement, through May 31, 2018. Remaining data will be availabe as it is produced, starting with most recent and working backwards through the mission.

Information about the data products including data availability, user documentation and quality statements, relevant links, sample read software, and tools for working with the data, etc. can be found at the following ASDC link: https://eosweb.larc.nasa.gov/project/calipso/calipso_table.

In-depth overviews for the products can be found at the following CALIPSO link to the data quality summaries: https://www-calipso.larc.nasa.gov/resources/calipso_users_guide/data_quality/index.php.


October 15, 2018 - ATTENTION: ONGOING
The Data Availability Tool is currently being updated. This should only be a few days. We are sorry for the inconvenience. ASDC’s HTML Data Ordering web site is available to display all of CALIPSO’s orderable data. To access this site, please click here
https://eosweb.larc.nasa.gov/HBDOCS/langley_web_tool.html.


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.

INTRODUCTION

The Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellite provides new insight into the role that clouds and atmospheric aerosols (airborne particles) play in regulating Earth's weather, climate, and air quality.

CALIPSO combines an active lidar instrument with passive infrared and visible imagers to probe the vertical structure and properties of thin clouds and aerosols over the globe. CALIPSO was launched on April 28, 2006 with the cloud profiling radar system on the CloudSat satellite.

CALIPSO and CloudSat are highly complementary and together provide new, never-before-seen 3-D perspectives of how clouds and aerosols form, evolve, and affect weather and climate. CALIPSO and CloudSat fly in formation with three other satellites in the A-train constellation to enable an even greater understanding of our climate system from the broad array of sensors on these other spacecraft.

CALIPSO is a joint U.S. (NASA) and French (Centre National d'Etudes Spatiales/CNES) satellite mission that has been in operation for four years.  » Read more …

QUICK LINKS

» CALIPSO’s Data Availability Tool
» CALIPSO’s Search and Subsetting Web Application


NASA
Last Updated: November 28, 2017
Curator: Charles R. Trepte
NASA Official: Charles R. Trepte

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