ASDC | CAL_ODCOD_ext_05km_V4-5

CALIOP AEP Level 2

Entry Title: CALIOP Clear-Sky Constrained Aerosol Extinction Profiles ODCOD Version 1

Entry ID: CAL_ODCOD_ext_05km_V4-5_1

Aerosols

Description

CAL_ODCOD_ext_05km_V4-5_1 provides a global dataset of clear-sky aerosol extinction profiles derived from CALIOP data, offering valuable insights into aerosol behavior over oceanic regions from 2006 to 2023. These retrievals use column aerosol optical depth (AOD) from CALIOP Ocean-Derived Column Optical Depth (ODCOD), based on satellite measurements, to constrain the retrieval of extinction profiles during daytime and nighttime over oceans.

Traditional CALIOP aerosol extinction retrievals rely on lidar ratios, introducing significant systematic uncertainties (~30–50%) in extinction estimates. To mitigate these uncertainties, this dataset replaces lidar ratios with column-equivalent AOD from ODCOD, enabling improved retrievals of attenuation profiles globally over oceans.

Validation against more than 150 coincident airborne High Spectral Resolution Lidar (HSRL) datasets demonstrates strong agreement, with mean bias differences within 0.01 km⁻¹ (10%). Compared to CALIOP V4.51 operational aerosol extinction retrievals, the ODCOD-based retrievals reduce bias and RMS differences by nearly a factor of two, significantly improving accuracy.

These ocean-focused CALIOP aerosol extinction profiles are invaluable for studies such as PM2.5 estimation in marine environments and reducing uncertainties in aerosol radiative forcing assessments.

DOI

10.5067/CALIOP_MODIS_MERRA2/CAL_ODCOD_ext_05km_V4-5_L2.001

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From GCMD Science Keywords:

AEROSOL EXTINCTION

Lidar Ratio

Data Distribution

File Format(s):

netCDF-4 classic

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Spatial Information

Spatial Coverage: (S: -82, N: 82), (W: -180, E: 180)
Spatial Coverage Type: Horizontal Vertical
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

GLOBAL

Temporal Information

Temporal Coverage: 2006-06-12 - 2023-06-30

Platforms

Models

MERRA-2

The second Modern-Era Retrospective analysis for Research and Applications

Earth Observation Satellites

Aqua

Earth Observing System, Aqua

MODIS

Moderate-Resolution Imaging Spectroradiometer

CALIPSO

Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations

CALIOP

Cloud-Aerosol Lidar with Orthogonal Polarization

Metadata Dates

Created on 2025-05-13